scholarly journals Optimizing the sand cushion

2019 ◽  
Vol 7 (4) ◽  
pp. 32-35
Author(s):  
Vyacheslav Glukhov ◽  
Ol'ga Hryanina ◽  
Svetlana Glukhova ◽  
Anastasia Pugina
Keyword(s):  
Clay Soils ◽  
Construction Site ◽  
Advantages And Disadvantages ◽  
Saturated Clay ◽  
Metal Pipes ◽  
Water Saturated ◽  
Economic Comparison ◽  
Sand Cushion

It is known that the stress values and the distribution of the latter in depth depend to a large extent on the size of the Foundation sole and especially the width. In this article, in order to select the optimal width of the Foundation sole and the thickness of the sand cushion, the influence of the sole width on the distribution of vertical stresses in the ground base is studied on the example of foundations for metal pipes. The presence of weak water-saturated clay soils within the construction site was taken into account. Variants of the device from traditional prismatic piles and foundations of small laying on a sandy pillow are offered. a technical and economic comparison of options was carried out. The advantages and disadvantages of each option are analyzed. Using the methodology of verification calculations in the design of sandbags, the optimization of the accepted version of the foundations was made.

Study of the Processes of Consolidation of a Thick Mass of Water-Saturated Clay Soils when Erecting Unique Structures

2018 ◽  
Vol 55 (5) ◽  
pp. 333-339 ◽  
Author(s):  
M. Yu. Abelev ◽  
I. V. Averin ◽  
D. Yu. Chunyuk ◽  
O. V. Kopteva
Keyword(s):  
Clay Soils ◽  
Saturated Clay ◽  
Water Saturated

scholarly journals Soil bases modified with lime waste and polycarboxylates

2021 ◽  
Vol 2124 (1) ◽  
pp. 012023
Author(s):  
L V Zakrevskaya ◽  
K A Nikolaeva ◽  
A I Gandelsman ◽  
P A Orekhov
Keyword(s):  
Physical And Mechanical Properties ◽  
Road Construction ◽  
Clay Soils ◽  
Infrastructure Development ◽  
Laboratory Studies ◽  
The Road ◽  
Saturated Clay ◽  
Water Saturated ◽  
The Cost ◽  
Local Materials

Abstract Increasing the volume of road construction is one of the priority areas of infrastructure development in any country. When building roads, it is preferable to use local materials to reduce the cost of their transportation, therefore, it is advisable to build the roadbed on local soils. It is worth noting that clay water-saturated soils are the most common, which complicates the construction of the road due to some features of this type of soil. The object of the study is a water-saturated clay with the following characteristics: natural humidity from 25.3 % to 28.1% by weight, optimal humidity from 11.8 % to 16.7% by weight, the number of plasticity from 0.118 to 0.153. Clay soils have a number of features: waterlogged soils are difficult to compact and develop, it is quite problematic to dry them, and thixotropy is also characteristic of clay soils. In this regard, it is most advisable to use the method of complex mineral binders to optimize their physical and mechanical properties. In the course of laboratory studies, compositions of soil compositions with the addition of lime waste and superplasticizer P-17 were developed. The dependence of the strength on the consumption of mineral binders and surfactants is established: the maximum compressive strength of the soil being fixed is achieved at a lime content of 25 wt.% and at a P-17 content in the range of 0.10-0.5 wt.%.

scholarly journals PLANNING LARGE-SCALE MODELLING OF FOUNDATION ON THE BASE IM-PROVED BY GEOTEXTILE ENCASED STONE COLUMNS

2016 ◽  
Vol 3 (2) ◽  
pp. 90-95
Author(s):  
Роман Шенкман ◽  
Roman Shenkman ◽  
Андрей Пономарев ◽  
Andrey Ponomarev
Keyword(s):  
Large Scale ◽  
Experimental Studies ◽  
Stone Columns ◽  
Clay Soils ◽  
Weak Bases ◽  
Saturated Clay ◽  
Scale Modelling ◽  
The Subject ◽  
Water Saturated ◽  
Perm Region

The article provides information about improvement of the weak clay subgrade using geotextile encased stone columns. The article also presents overview of the technology, the state of knowledge on this topic. Article gives materials about relevance of the study of this technology for applying in Perm region which is characterized by the presence of weak bases represented by water-saturated clay soils. The overview and analysis of existing experimental studies of various scholars on the subject, which allows to identifying the area of the current study which aim is applying this technology to improve the weak bases of the foundations of buildings and structures, are presented. Also it considers the problem of planning of the experimental studies of geotextile encased stone columns in the laboratory conditions. The paper presents developed experimental schemes. Conclusions on the relevance and novelty are given. The objectives of the planned experimental studies are made.

scholarly journals An Experimental Study on the Effect of Tire Powder on the Geotechnical Properties of Clay Soils

2018 ◽  
Vol 4 (3) ◽  
pp. 594 ◽  
Author(s):  
Davood Akbarimehr ◽  
Esmael Aflaki
Keyword(s):  
Clay Soil ◽  
Geotechnical Properties ◽  
Atterberg Limits ◽  
Clay Soils ◽  
Positive Effects ◽  
Advantages And Disadvantages ◽  
Different Types ◽  
Problematic Soils ◽  
Geotechnical Problems ◽  
Comprehensive Study

With respect to the increasing production of tire wastes, the use of these wastes as an additive in civil engineering has always gained attentions of researchers due to their positive effects on material properties and reduction of environmental problems. Clay soils, as problematic soils, have always caused geotechnical problems including high Atterberg limits and consequently low workability. Tire powder, as one of the products of tire wastes, lacks clay cohesion and it can be effective in altering the plasticity of clay soils. As no comprehensive study has been conducted in this regard specifically on Tehran clay soil yet, this research studies experimentally the effect of adding different percentages of tire powder to clay soil at the Atterberg limits of clay soils with two different types of plasticity. More over according to previous studies, the effect of tire powder on other geotechnical properties of clay soils and the advantages and disadvantages of using tire powder in clay soils are discussed. The results indicate that addition of tire powder to clay soils has positive effects on reducing the Atterberg limits, increasing efficiency, and improving resistance, permeability, swelling reduction, and settlement properties, and reducing soil density and it can be used as an additive in improving clay soils.

scholarly journals Application of modern geotechnologies for protection of territories against rockfall processes

2016 ◽  
Vol 3 (2) ◽  
pp. 74-78
Author(s):  
Сергей Нуйкин ◽  
Sergey Nuykin
Keyword(s):  
Clay Soils ◽  
Concrete Piles ◽  
Advantages And Disadvantages ◽  
Scope Of Application

The method of pressing installation factory concrete piles is proposed. Main advantages and disadvantages of the method and it’s analyze, defined the scope of application are described. Authors give recommendations on using installation in clay soils for construction-confined projects. In the publication constructive units, elements and components to improve this method are given

Application of Energy-Saving Building Materials and Economic Comparison

2012 ◽  
Vol 193-194 ◽  
pp. 448-451
Author(s):  
Zhong Min Liu ◽  
Wei Gao ◽  
Jing Ji
Keyword(s):  
Energy Saving ◽  
Building Materials ◽  
Reactive Power ◽  
Construction Project ◽  
Future Directions ◽  
Advantages And Disadvantages ◽  
Cost Of Energy ◽  
Frp Reinforcement ◽  
Engineering Cost ◽  
Economic Comparison

This article introduces several common building materials and new-style energy-saving materials, and their advantages and disadvantages are given. Reactive power concrete and FRP reinforcement will be applied widely in actual engineering. Through specific examples engineering cost of energy-saving materials is introduced, finally gives the building developments and future directions, these can provide reference for application of novel materials in construction project.

Study of Shear Constitutive Model for Schistose Rock Mass

2013 ◽  
Vol 838-841 ◽  
pp. 800-804
Author(s):  
Shang Ge Liu ◽  
Hua Xu ◽  
Jian Liu ◽  
Xiao Tao
Keyword(s):  
Rock Mass ◽  
Constitutive Model ◽  
Engineering Practice ◽  
Direct Shear ◽  
Shear Tests ◽  
Peak Displacement ◽  
Direct Shear Tests ◽  
Advantages And Disadvantages ◽  
Piecewise Exponential ◽  
Water Saturated

Based on the direct shear tests of schist and shale at dry and water-saturated states, combed with the advantages and disadvantages of models for rock mass and structure surface, we proposed shear stress-displacement constitutive model of schistose rock mass. The model is in the form of piecewise exponential function and its advantages are as follows: Piecewise function can reasonably describe the nonlinear pre-peak shear hardening and post-peak shear softening characteristics; Regard peak strength, peak displacement and residual strength as critical points, so it can accurately describe the strength characteristics of the material; The fitting degree is high with direct shear tests both at dry and water-saturated states; Only one parameter value is needed to obtain by fitting experimental curves while others are convenient to determine. All of those are benefit to applications in engineering practice.

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