scholarly journals Process diagrams of the driving pile construction in the perforated pipe casing

2019 ◽  
pp. 2-2
Author(s):  
Vladimir A. Kovalev
Keyword(s):  
Bearing Capacity ◽  
Side Surface ◽  
Bulk Soil ◽  
Base Layer ◽  
Soil Conditions ◽  
Main Process ◽  
Foundation Engineering ◽  
Simultaneous Formation ◽  
Soil Material ◽  
Process Diagrams

Introduction. Driving piles in drilled wells are a new trend in pile foundation engineering. Further research and development are devoted to the improvement of structural and process diagrams of these piles in order to increase the bearing capacity mainly on their side surface, mainly in weak clay soils. Materials and Methods. The options of flow and process diagrams of driving piles in perforated (penetrated) wells in various soil conditions are studied taking into account the existing regulatory documents and earlier developments on increasing the bearing capacity of driving piles in perforated (penetrated) wells. Results. The main process operations of the driving piles installation in the soil conditions under consideration include perforation (penetration) of the well with a casing with a loose puncher shoe to the base layer of the soil; formation of a well (cavity) in the base layer of the well by means of immersion of the puncher shoe; installation of a shoe reamer in the puncher shoe and formation of a spread foundation made of hard soil material above; immersion of a casing pipe with holes outside the pipe casing; filling of the casing with hard and bulk soil material; removal of the casing and driving (immersion) into the pipe casing of the precast concrete pile filled with bulk soil material with simultaneous formation of additional local broadening and possible compacted soil zones on the sections of holes along the outer contour of the pipe casing. Conclusions. The proposed structural and process diagrams of driving piles in perforated (penetrated) wells allow to significantly expand the scope of their application in terms of soil conditions, increase the side surface bearing capacity of piles and reliability of the construction of the types of foundations under consideration.

Improving the test methodology of design piles on a construction site

2020 ◽  
pp. 9-13
Author(s):  
Igor Boyko ◽  
Tetiana Dyptan
Keyword(s):  
Bearing Capacity ◽  
Tall Buildings ◽  
Side Surface ◽  
Soil Conditions ◽  
Special Technique ◽  
Technical Object ◽  
Static Tests ◽  
Pull Out ◽  
Real Objects ◽  
Test Schedule

Reliable solutions for the design of tall buildings with pile foundations depend on the correctness of the load-bearing capacity. In some cases, you need to know that it is impossible to determine the ability on the side surface and under the sole. To do this, it is proposed to develop a special technique that combines tests to remove and pull out and educate the nature of the downloads (static or  kinematic).Тhe publication proposes a method of testing piles in the field, which simulates the processes that accompany the interaction of the pile with the soil base in real situations of operation of the technical object: for example, emergency soaking of soils when there is no time for stabilization deformations under load from a building or structure. It is shown that the value of friction on the side surface of the piles significantly depends on the nature of the loads. The analyzed results of the test schedule allow to separate these two components in the case when unloading is carried out continuously and the beginning of the pile movement in the opposite direction gives the value of soil resistance on the side floor. This simulates the real behavior of the pile at the base of the building, because in real objects there is no time for stabilization.It is offered to carry out tests of piles before loading which causes continuous indentation of piles, and division into components - bearing capacity on lateral surface Fdf and bearing capacity under the sole of the pile FdR will allow to accumulate the calculated soil supports in the respective zones, which makes it possible to create tables «R» and «f» for soil conditions of Ukraine.Taking into account the peculiarities of the construction of the pile test schedule and the proposed approaches will allow to correctly determine the components used in determining the bearing capacity of the pile. The accumulation of test results in the future will clarify the calculated soil supports of Ukraine. Reliable values of the calculated resistances will reduce the amount of static tests, which are time consuming and expensive.

scholarly journals Probabilistic assessment of pile capacity based on CPTu probing including random pile foundation depth

2018 ◽  
Vol 196 ◽  
pp. 01058 ◽  
Author(s):  
Marek Wyjadłowski ◽  
Irena Bagińska ◽  
Jakub Reiner
Keyword(s):  
Bearing Capacity ◽  
Objective Assessment ◽  
Probabilistic Approach ◽  
Measurement Data ◽  
Direct Methods ◽  
Side Surface ◽  
Design Stage ◽  
Direct Data ◽  
Design Calculations ◽  
The Impact

The modern recognition of subsoil with the use of CPTu static probes allows to obtain detailed information necessary for the designing. Registered basic two quantities, i.e. cone resistance qc and friction on the sleeve fs, often become direct data, which allow to estimate bearing capacity of the base and the side surface of the pile. Direct methods use similarity of the pile work and piezo-cone work during the examination. An important design stage is the appropriate development of measurement data prior to the commencement of the procedure of determining the pile bearing capacity. Algorithms generated on the basis of empirical experiments are often applied with the simultaneous use of test loads. The probabilistic approach is also significant, because it enables objective assessment of the reliability level of performed design calculations. This work contains an analysis of the impact on the estimated bearing capacity and reliability of a pile of variable random depth of the pile base. It also includes the determination of probabilities of obtaining the assumed safety index for the designed solution at random foundation depth.

scholarly journals Ultimate Bearing Capacity of Stabilized Soil in Pavements

2020 ◽  
Vol 9 (5) ◽  
pp. 2349-2351
Keyword(s):  
Fly Ash ◽  
Bearing Capacity ◽  
Coal Ash ◽  
Ultimate Bearing Capacity ◽  
Load Test ◽  
Base Layer ◽  
Plate Load Test ◽  
Rubber Powder ◽  
Stone Dust ◽  
Stabilized Soil

This paper discusses the Ultimate Bearing Capacity of a stabilized soil by using the fly ash, stone dust and rubber powder for design of a pavement. This paper will help in utilization of locally available waste materials to reuse in the subbase and subgrade layers of pavement. Rubber powder is a waste byproduct generated from the recycling of tires, and is not so easy for degradable, and hence leads to release of harmful gases when it tends to burn. Stone dust is a locally available waste generated product from quarries. The generation of stone dust is increasing day to day in large quantity. The huge quantity of stone dust storage amount will affect the quality of soil. Fly ash is waste combusted coal ash powder generated from the steamers of coal boilers with the burning of fuel gases together. In the sub grade layer the soil is mixed in different proportions with stone dust for hard foundation. In the sub base layer the soil is stabilized with the combination of rubber powder and fly ash. When the rubber powder and fly ash, mixed with water for compaction generates a bond between the soil particles to settle the air fields. In this paper various percentages of rubber powder, stone dust and fly ash with different samples for pavement is layered, and after that plate load test is conducted upon it.

scholarly journals ANALYSIS OF THE FIELD TESTS RESULTS OF BORED CONICAL PILES UNDER THE ACTION OF VARIOUS TYPES OF LOADS

2018 ◽  
Vol 3 (3) ◽  
pp. 24-29
Author(s):  
Ирина Рыбникова ◽  
Irina Rybnikova ◽  
Александр Рыбников ◽  
Aleksandr Rybnikov
Keyword(s):  
Bearing Capacity ◽  
Load Capacity ◽  
Normal Component ◽  
Cone Angle ◽  
Field Tests ◽  
Side Surface ◽  
Test Results ◽  
Head Diameter ◽  
Cylindrical Piles ◽  
Bored Piles

One of the methods of improving the bearing capacity of bored piles is giving them a taper. The feature of these (wedge-type) piles is that under load they work "as a thrust" and transfer part of the load due to the normal component to the inclined side surface. Three sizes of tapered bored piles were tested, with the length of 4.5 m, head diameter 0.4; 0.5; 0.6 m and with cone angle 1o and 2,5o. The test results were compared with the test results of cylindrical piles, 4.5 m long, with head diameter 0.4 m and 0.6 m. It has been discovered that with the increasing cone angle, the bearing capacity of piles against the pressing load, especially the specific load capacity for 1 m3 of material, as compared to cylindrical piles, increases significantly. It has been determined that the larger is the diameter of the head of the pile, the higher is the bearing capacity against the horizontal load, and the bearing capacity against the pullout load is equal to the breakout force of a pile from the soil.

Model Tests of Foundation Bearing Capacity of Sandy Soil and Pile Foundation Bearing Capacity

2014 ◽  
Vol 580-583 ◽  
pp. 113-117
Author(s):  
Shi Jie Lu ◽  
Hua Dong Chen ◽  
Wei Chen ◽  
Tong Xiang ◽  
Xie Feng Hong
Keyword(s):  
Bearing Capacity ◽  
Sandy Soil ◽  
Pile Foundation ◽  
Soil Mechanics ◽  
Model Tests ◽  
Foundation Engineering ◽  
Foundation Settlement ◽  
Load Bearing ◽  
Model Device ◽  
Weight Loading

Using self―made model device, researchers studied the characteristics of foundation settlement of sandy soil and pile foundation load―bearing in sandy soil. Through weight loading, researchers analyzed the phenomenon of foundation settlement. Then, researchers embedded friction piles in sand, so as to analyzed pile foundation bearing capacity. The methods and results of the research can provide guidance for teaching of Soil mechanics and foundation engineering.

Determining the Pile Bearing Capacity by the Curve Match Method of High Strain Dynamic Testing

2013 ◽  
Vol 438-439 ◽  
pp. 1414-1418
Author(s):  
Wei Ding ◽  
Qing Liu ◽  
Bing Yu Wang ◽  
Kang Kang Sun ◽  
Feng Tao Sui
Keyword(s):  
Bearing Capacity ◽  
Static Loading ◽  
Pile Foundation ◽  
High Strain ◽  
Dynamic Testing ◽  
Design Parameters ◽  
Foundation Engineering ◽  
Match Method ◽  
Error Sources ◽  
Shaft Resistance

This paper determines the bearing capacity of pile and shaft resistance by the curve match method of high strain dynamic testing. By the comparison of bearing capacity of pile between the testing results of static loading and dynamic high strain, the reliability and surveying precision of the curve match method is analyzed, and the error sources and reasons are explored, to reasonably determine the design parameters of pile foundation engineering.

scholarly journals Pile of high bearing capacity

2019 ◽  
Vol 6 (3) ◽  
Author(s):  
Vladimir Dubinin ◽  
Aleksandr Piskunov ◽  
Valery Kruglov
Keyword(s):  
Bearing Capacity ◽  
Construction Industry ◽  
Pile Foundation ◽  
Side Surface ◽  
Longitudinal Axis ◽  
Pile Foundations ◽  
Design And Technology ◽  
Construction Technology ◽  
Economic Costs ◽  
Soil Base

The article discusses issues related to the construction of pile foundations of buildings and structures, including bridges and other transport facilities. The development of the construction industry contributes to the improvement of pile Foundation construction technology and a significant reduction in economic costs. Improving the design and technology of pile foundations is one of the main tasks in the field of transport construction. The effectiveness of pile foundations is due to the more complete use of the bearing capacity of the soil base and the strength of the Foundation elements. One of the disadvantages of the pile foundation is the low bearing capacity of the soil on the side surface of the pile. The proposed solution is based on the device along the longitudinal axis of the pile rigidly fixed, multi-pass continuous inclined edges having the shape of a plate, and faces adjacent to the side surface of the tubular steel barrel.

scholarly journals ANALYSIS OF THE RESULTS OF TENSOMETRIC STUDIES OF NATURAL BORED CONICAL PILES

2020 ◽  
pp. 44-55 ◽  
Author(s):  
I. Rybnikova ◽  
A. Rybnikov
Keyword(s):  
Bearing Capacity ◽  
Lateral Surface ◽  
Sandy Loam ◽  
Side Surface ◽  
Contact Stresses ◽  
Strain Gauges ◽  
Soil Resistance ◽  
Taper Angle ◽  
Different Types ◽  
Bored Piles

Four bored piles of two standard sizes with a length of 4,5 m, a diameter of heads of 0,4 and 0,6 m, a diameter of the lower end of 0,2 m with a taper angle of 1o20ʹ and 2o40ʹ, respectively, are studied. Two different types of piles are equipped with a height of four strain gauges, and two-ten bulldozers of five on each of the diagonal opposite sides. The soils on the experimental ground are composed of solid sandy loam. According to the measurements of strain gauges and load cell, plots of the distribution of forces and stresses in sections along the pile trunk, as well as plots of contact stresses along their lateral surface are constructed. The results of the research revealed that additional forces of soil repulsion along the inclined lateral surface during its sedimentation under load are significantly involved in the bearing capacity of bored conical piles. The proportion of soil resistance, depending on the angle of taper, is 34-49 % of the total bearing capacity, the resistance of the lower end – 17-23 %, friction on the side surface of the trunk-34-43 %. These data indicate the effectiveness of giving the trunks of bored piles up to 5 m even a slight taper in the range of 1,5 o ... 3,0 o.

scholarly journals PENGARUH KEMIRINGAN FONDASI TIANG PANCANG BATTERED PILE PADA TANAH LEMPUNG DAN TANAH PASIR

2020 ◽  
Vol 3 (2) ◽  
pp. 467
Author(s):  
Swendrinata Suwardi ◽  
Andryan Suhendra
Keyword(s):  
Ground Water ◽  
Bearing Capacity ◽  
Carrying Capacity ◽  
Clay Soil ◽  
Soil Conditions ◽  
Sand Soil ◽  
Lateral Capacity ◽  
Pile Up ◽  
Calculation Results ◽  
Curve Method

The Battered Pile  is one of the foundation designs that aims to increase the lateral bearing capacity of the foundation. Battered Pile are designed with a certain slope that aims to increase the lateral capacity of the soil. The type of soil used will affect the lateral capacity of the pole. Calculation of bearing capacity of the pile is carried out on the condition of clay and sand soils at slope 00 to +200. The calculation results will then be analyzed to understand the effects that occur. The calculation results will be presented in the p-y curve method. The use of this method is expected to make it easier to understand the characteristics of Battered Pile for soil conditions. Based on the analysis it was found that an increase in the  capacity of the pile up to 23% in the slope of 100 to 150. Sand soil in conditions below the surface of the ground water will have a linear carrying capacity and have a lower deflection value when compared to clay soil at a depth of 2 meters. But at a depth of 16 meters, clay has a point where it has a lower deflection value compared to sandy soil.AbstrakTiang pancang Battered Pile merupakan salah satu rekasaya fondasi yang bertujuan untuk meningkatkan daya dukung lateral fondasi. Tiang Battered Pile dipancang dengan kemiringan tertentu yang bertujuan untuk meningkatkan daya dukung lateral tanah. Jenis tanah yang digunakan akan mempengaruhi daya dukung lateral tiang. Perhitungan daya dukung tiang dilakukan pada kondisi tanah lempung dan tanah pasir pada kemiringan 00 hingga +200. Hasil perhitungan kemudian akan dianalisis untuk memahami pengaruh yang terjadi. Hasil perhitungan akan disajikan dalam metode p-y curve. Penggunaan metode ini diharapkan dapat memudahkan dalam memahami karakteristik tiang Battered Pile terhadap kondisi tanah. Berdasarkan analisis didapatkan bahwa terjadi peningkatan daya dukung tiang hingga 23% pada kemiringan 100 hingga 150. Tanah pasir pada kondisi di bawah permukaan air tanah akan mengalami kenaikan daya dukung secara linier  dan memiliki  nilai lendutan yang lebih kecil jika dibandingkan dengan tanah lempung pada kedalaman 2 meter. Tetapi pada kedalaman 16 meter, tanah lempung memiliki titik dimana memiliki nilai lendutan yang lebih kecil jika dibandingkan dengan tanah pasir.

scholarly journals Trafficability Prediction Using Depth-to-Water Maps: the Status of Application in Northern and Central European Forestry

2022 ◽  
Author(s):  
Stephan Hoffmann ◽  
Marian Schönauer ◽  
Joachim Heppelmann ◽  
Antti Asikainen ◽  
Emmanuel Cacot ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Spatial Information ◽  
Heavy Rain ◽  
Soil Conditions ◽  
Specific Information ◽  
Topographic Wetness Index ◽  
Forest Operations ◽  
Salvage Logging ◽  
The Status ◽  
Governmental Institutions

Abstract Purpose of Review Mechanized logging operations with ground-based equipment commonly represent European production forestry but are well-known to potentially cause soil impacts through various forms of soil disturbances, especially on wet soils with low bearing capacity. In times of changing climate, with shorter periods of frozen soils, heavy rain fall events in spring and autumn and frequent needs for salvage logging, forestry stakeholders face increasingly unfavourable conditions to conduct low-impact operations. Thus, more than ever, planning tools such as trafficability maps are required to ensure efficient forest operations at reduced environmental impact. This paper aims to describe the status quo of existence and implementation of such tools applied in forest operations across Europe. In addition, focus is given to the availability and accessibility of data relevant for such predictions. Recent Findings A commonly identified method to support the planning and execution of machine-based operations is given by the prediction of areas with low bearing capacity due to wet soil conditions. Both the topographic wetness index (TWI) and the depth-to-water algorithm (DTW) are used to identify wet areas and to produce trafficability maps, based on spatial information. Summary The required input data is commonly available among governmental institutions and in some countries already further processed to have topography-derived trafficability maps and respective enabling technologies at hand. Particularly the Nordic countries are ahead within this process and currently pave the way to further transfer static trafficability maps into dynamic ones, including additional site-specific information received from detailed forest inventories. Yet, it is hoped that a broader adoption of these information by forest managers throughout Europe will take place to enhance sustainable forest operations.

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