Discussion of Stress-Strain Characteristics of a Saturated Clay Soil at Various Rates of Strain

1970 ◽  
Vol 13 (5) ◽  
pp. 0690-0690
Author(s):  
Yu-Tang Chou
Keyword(s):  
Clay Soil ◽  
Stress Strain ◽  
Saturated Clay

Stress-Strain Characteristics of a Saturated Clay Soil at Various Rates of Strain

1970 ◽  
Vol 13 (5) ◽  
pp. 0685-0689 ◽  
Author(s):  
Awatif M. El-Domiaty ◽  
William J. Chancellor
Keyword(s):  
Clay Soil ◽  
Stress Strain ◽  
Saturated Clay

Variation for Soil Stress on CPTU Model Test

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.

Study of Infiltration into Partially Saturated Clay Soil Railway Embankment

2017 ◽  
pp. 477-495
Author(s):  
Taifeng Li ◽  
Qianli Zhang ◽  
Degou Cai ◽  
Jianping Yao ◽  
Feng Chen
Keyword(s):  
Clay Soil ◽  
Partially Saturated ◽  
Saturated Clay

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 %.

scholarly journals Numerical simulation of the stress strain state of base of the multi-helix screw pile under static loading in clay soil

2020 ◽  
pp. 28-36
Author(s):  
Volodymyr Sedin ◽  
Vladyslav Kovba ◽  
Yurii Volnianskyi ◽  
Kateryna Bikus
Keyword(s):  
Numerical Modeling ◽  
Bearing Capacity ◽  
Static Loading ◽  
Strain State ◽  
Clay Soil ◽  
Full Scale ◽  
Stress Strain ◽  
Foundation Construction ◽  
Stress Strain State ◽  
Screw Pile

A full-scale experiment was conducted to study the operation of a multi-helix screw pile under static pressing and pulling load in dusty clay soil. Based on the full-scale test of a multi-helix screw pile under static loading in dusty clay soil, numerical modeling of the stress-strain state of the base of the multi-helix screw pile was performed. Multi-helix screw piles are actively used all over the world, and have also become widespread in Ukraine. Foundations made of multi-helix screw piles are often used for industrial construction as well as the foundations of low-rise buildings and structures. Despite the growing demand for the use of multi-helix screw piles in modern construction, there is no official document calculating the features of their design and bearing capacity of a multi-helix screw pile. This poses a number of new tasks for engineers and geotechnical: a) development of new modern calculation methods; b) development and use of modern normative documents and recommendations for the calculation of foundations from multi-helix screw piles in various soil conditions; с) use of computer-aided design systems for calculation of complex geotechnical tasks; d) development of calculation models that will take into account nonlinear models of deformation of materials and soil base. Foundations made of multi-helix screw piles are a promising direction in the field of foundation construction due to the reduction of the duration of the foundation and its economic. This requires the development of regulations with recommendations for the calculation and use of multi-helix screw piles in the field of foundation construction, development of modern calculation models for the calculation of bearing capacity and settling of multi-helix screw piles in different geological conditions. Based on the results of the field study of the work of multi-helix screw piles in clay soils, numerical modeling of the stress-strain state of the base of the multi-turn pile was performed, and their results were compared.

THE EFFECTIVE STRESS RESPONSE OF A SATURATED CLAY SOIL TO REPEATED LOADING

1969 ◽  
Vol 6 (3) ◽  
pp. 241-252 ◽  
Author(s):  
D. A. Sangrey ◽  
D. J. Henkel ◽  
M. I. Esrig
Keyword(s):  
Pore Water ◽  
Effective Stress ◽  
Critical Level ◽  
Clay Soil ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Triaxial Tests ◽  
Repeated Loading ◽  
Repeated Stress ◽  
Saturated Clay

The results of a series of tests designed to examine the behavior of saturated clay soil under repeated loading are reported. Triaxial tests, under conditions of axial symmetry, were used and the rates of deformation were chosen so as to permit the accurate measurement of pore water pressure at all stages of the tests.It was found that, for any particular consolidation history, a critical level of repeated stress existed. Below this critical level, a state of nonfailure equilibrium was reached in which the stress-strain curves followed closed hysteresis loops. Above the critical level of repeated stress, effective stress failure occurred; and each cycle of loading produced cumulative increases in deformation.An interesting feature of the test results was that a linear relationship between the magnitude of the applied repeated stress and the increase in pore water pressure was found for stress levels below the critical value.

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