Simple methods of determining compressional thermal creep in the skeleton of a water-saturated clay soil

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 %.

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Design of experiments to consolidate the water-saturated clay soil base by magnesium sulfate in the construction of buildings and structures

PNRPU Construction and Architecture Bulletin ◽

10.15593/2224-9826/2016.4.10 ◽

2016 ◽

Vol 7 (4) ◽

pp. 102-110

Author(s):

Liubov Igosheva ◽

◽

Alla Grishina

Keyword(s):

Design Of Experiments ◽

Magnesium Sulfate ◽

Clay Soil ◽

Soil Base ◽

Saturated Clay ◽

Water Saturated

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Improving the efficiency of pile foundations, organized in heaving soils

On-line Journal Naukovedenie ◽

10.15862/09ko615 ◽

2015 ◽

Vol 7 (6) ◽

Author(s):

Anton Dobrynin

Keyword(s):

Comparative Analysis ◽

Calculation Method ◽

Clay Soil ◽

Point Of View ◽

Pile Foundations ◽

Frost Heaving ◽

Method Of Calculation ◽

Saturated Clay ◽

Water Saturated

The recommendations about calculation offered in this article extend on the ferroconcrete two-conical piles immersed by cave-in for the bases of buildings and constructions which design is developed by "Highways and Bridges" chair of the Perm national research polytechnical university. Two-conical piles are characterized by the increased resilience to action of forces of a frost heaving in comparison with traditionally applied prismatic piles at the expense of the return orientation of the top cone.The description of a method of calculation of the base in the form of a bush from two-conical piles is provided in frosty water-saturated clay soil from the point of view of its stability against action of forces of a frosty heaving. The comparative analysis of the obtained settlement data with experimental is carried out. The technique of determination of size of a frosty heaving of two-conical piles as a part of base bushes is developed and in number realized by forces of a frosty heaving when modeling soil as linearly -deformable space. The calculation method which basis the condition of equality of the works made by forces of a frosty heaving, and forces interfering a frosty heaving of not loaded pile bases from two-conical piles is is offered. The method allows to project with an accuracy sufficient for practical purposes the bases in water-saturated clay soil.

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

Soil Mechanics and Foundation Engineering ◽

10.1007/s11204-018-9545-x ◽

2018 ◽

Vol 55 (5) ◽

pp. 333-339 ◽

Cited By ~ 1

Author(s):

M. Yu. Abelev ◽

I. V. Averin ◽

D. Yu. Chunyuk ◽

O. V. Kopteva

Keyword(s):

Clay Soils ◽

Saturated Clay ◽

Water Saturated

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Variation for Soil Stress on CPTU Model Test

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.44-47.2597 ◽

2010 ◽

Vol 44-47 ◽

pp. 2597-2601

Author(s):

Yan Chun Tang ◽

Gao Tou Meng

Keyword(s):

Stress Field ◽

Maximum Stress ◽

Clay Soil ◽

Cell Layer ◽

Compression Stress ◽

Soil Pressure ◽

Piezocone Penetration Test ◽

Main Stress ◽

Saturated Clay ◽

Soil Stress

Through a series of Piezocone Penetration Test (CPTU) model tests with saturated clay soil, by CPTU probe penetrating soil stress measured by soil pressure mini-cells embedded into soil has been acquired, the variation rules of soil stress by penetrating has been analyzed, the results show that with probe close to the second cell layer, the stress measured by the cells has been increased rapidly; when probe has arrived at the position of the second cell layer, the maximum stress value has been attained; and with probe away from the second cell layer, the stress value has been decreased rapidly. Based on the achieved soil stress value, the axial and radial subsidiary stress field causing by penetrating has been acquired, the conclusions can be obtained that the main stress style of the axial subsidiary stress is compression stress, around the probe the highest stress field has been occurred; the stress style of the radial subsidiary stress is compression stress, this phenomenon shows that by penetrating the compaction effect of the soil around the probe has been created; during the course of penetrating, the radial subsidiary stress is less than the axial subsidiary stress obviously. The achieved result can provide a foundation for further study for CPTU mechanism.

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Optimizing the sand cushion

Construction and Architecture ◽

10.29039/2308-0191-2019-7-4-32-35 ◽

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.

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