scholarly journals Undrained solution of cylindrical cavity expansion for unsaturated soils with modified Cam-clay model

2021 ◽  
Vol 787 (1) ◽  
pp. 012159
Author(s):  
Zhanghui Zhai ◽  
Shengjun Ma ◽  
Yaguo Zhang ◽  
Changliang Zhang
Keyword(s):  
Cylindrical Cavity ◽  
Unsaturated Soils ◽  
Cavity Expansion ◽  
Clay Model ◽  
Cylindrical Cavity Expansion ◽  
Modified Cam Clay ◽  
Cam Clay

Drained solution for cylindrical cavity expansion in modified Cam clay soil under constant vertical stress

2020 ◽  
pp. 1-14
Author(s):  
D. Su
Keyword(s):  
Plane Strain ◽  
Cylindrical Cavity ◽  
Stress Condition ◽  
Vertical Stress ◽  
Plane Strain Condition ◽  
Cavity Expansion ◽  
Strain Condition ◽  
Cylindrical Cavity Expansion ◽  
Modified Cam Clay ◽  
Cam Clay

Cavity expansion is a fundamental theoretical problem in geomechanics. For the cylindrical cavity expansion problem, derivations of solutions are usually based on the assumption that the soil is subject to the plane strain condition. However, this is untrue for cavity expansion in pressuremeter tests. This study first derived the equilibrium equation for cylindrical cavity expansion under the constant vertical stress condition. Then, the equilibrium equation was solved for modified Cam clay soils with different overconsolidation ratios (OCRs). The solutions were compared with the responses in the same soils under the plane strain condition. It was found that the ratio of the limiting cavity pressure in the latter to that in the former ranged from 1.31 to 2.76 and increased with an increase in the OCR. Under the constant vertical stress condition, significant heaving occurred in the vicinity of the cavity, and volumetric strain evolved from contraction to dilation as the OCR increased. Significant differences were noted in the stress paths of the two different loading conditions. These results indicate that the assumption of the plane strain condition will lead to overestimation of the limiting cavity pressure and inaccurate prediction of the stress path in the pressuremeter test, especially for heavily overconsolidated soils.

scholarly journals Pressure-controlled cavity expansion in clay

2006 ◽  
Vol 43 (7) ◽  
pp. 714-725 ◽  
Author(s):  
Alfred SK Au ◽  
Albert T Yeung ◽  
Kenichi Soga
Keyword(s):  
Numerical Simulation ◽  
Aspect Ratio ◽  
Experimental Studies ◽  
Cavity Expansion ◽  
Reliable Technique ◽  
Clay Model ◽  
Modified Cam Clay ◽  
Pressure Controlled ◽  
Cam Clay ◽  
Good Agreement

Experimental studies and numerical simulation of experiments were conducted on pressure-controlled cavity expansion in clay. The modified Cam-clay model was used to describe the clay behaviour. The experimental data are in good agreement with the simulation results, indicating that the adopted numerical simulation procedure is a plausible and reliable technique to study the fundamental behaviour of pressure-controlled cavity expansion. A new parameter, cavity aspect ratio (CAR), was defined to better describe the cavity shape. Different phenomena during the cavity expansion process are thus studied numerically, and the results are presented in this paper.Key words: pressure-controlled cavity expansion, numerical simulation, laboratory investigation, modified Cam-clay model, cavity aspect ratio (CAR), ABAQUS.

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