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 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.

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 EXPERIMENTAL COMPARISON OF TWO DESIGNS OF ROAD CLOTHES WITH APPLICATION OF GEOGRID ARRANGED ON THE SLOPES OF LOGGING ROADS WITH WATER-SATURATED CLAY SOIL

2017 ◽  
Vol 7 (1) ◽  
pp. 126-136
Author(s):  
Сушков ◽  
Sergey Sushkov ◽  
Сергеев ◽  
Andrey Sergeev
Keyword(s):  
Experimental Study ◽  
Clay Soil ◽  
Cell Structure ◽  
Road Construction ◽  
Honeycomb Structure ◽  
Experimental Comparison ◽  
Base Surface ◽  
Saturated Clay ◽  
Pavement Structures ◽  
Water Saturated

The article describes the practical experimental study of two road structures, which used geosynthetic grid “Slavros GR” and in the form of honeycomb. Used materials and equipment for experimental research are described in details and graphically shown. A patent search of various designs of geosynthetic grids, used in road construction, is conducted. Materials used for the manufacture of polymer tapes are described in details. Positive and negative sides of geosynthetic gridsused in the experimental study are shown. There is an interesting offer for the location of the geosynthetic grids at a depth of 30 cm from the surface of the subgrade and geotextile material. Due to its location in the depth of 30 cm from the base surface of subgrade of geosynthetic grids and geotextile material the accumulation of moisture and water-saturated clay soil at the junction with the sand reduces, thereby eliminating the influence of frost penetration into the road structure. The authors have developed and proposed a new geosynthetic grid with honeycomb structure, containing seven nodes, with polymeric tapes and with the formation of six triangles which are in its turn are formed by a hexagon with six corner nodes and one central node. In an extended working position grid, stowed in place, represents the structure of a honeycomb with internal triangular cells directed to the center, which is filled with soil or stone bulk materials. The implementation of tapes in this way will increase the overall bearing surface of cell structure that will allow increasing its carrying capacity. The cellular structure of the honeycomb increases the resistance of pavement structures to the processes of cryotolerance soil on the slope by 30-40 %, and presence of the polymeric material of the rubber tape in the composition increases resistance to water erosion by 35-55 %.

CHANGE IN STRENGTH PARAMETERS OF DISPERSED SOILS AFTER HIGH-FREQUENCY VIBRATION

2021 ◽  
Vol 12 (1) ◽  
pp. 46-56
Author(s):  
V. M Polunin ◽  
A. P Cheremhina
Keyword(s):  
High Frequency ◽  
Field Measurements ◽  
Field Studies ◽  
Clay Soils ◽  
Laboratory Studies ◽  
Strength Parameters ◽  
High Frequency Vibration ◽  
Soil Foundation ◽  
Comparison Of The Results ◽  
Water Saturated

The use of the technology of high-frequency sheet piles driving or extraction in conditions of weak, structurally unstable soils inevitably leads to a change in the structure of the soil. This is especially true for buildings which fall into the zone of influence. Often, foundation for historical buildings is water-saturated sands, spread by fluid and fluid-plastic clay soils. In the process of external dynamic action, the soil foundation is been destructing, so their strength and deformation parameters are reduced. In this case, the result of vibration effects on a dispersed water-saturated sample can be both compaction for sandy soil and decompaction of clay soils. These changes lead to additional deformations of buildings and structures of the surrounding area. Therefore, the issue of assessing the limits of applicability of vibration technology in certain conditions is relevant. The object of the study is the changes in the properties of clay soils of various consistencies after exposure to vibration. The results of laboratory studies to determine the strength parameters of dispersed soils after high-frequency vibration are presented. The results of field measurements by CPT "before", "after" vibration immersion and vibration extraction of sheet piles are considered. Comparison of the results of field and laboratory studies is carried out to identify patterns of change in the strength characteristics of weak soils under the influence of vibration loads. A tendency towards a decrease in the strength parameters of dispersed soils is shown. Currently, due to the insufficient number of laboratory and field studies to study the effect of high-frequency vibration on the change in the strength parameters of weak water-saturated clay soils, it is not possible to identify a clear dependence of the change in parameters on the time and frequency of vibration.

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