Experimental study on plane strain of frozen silty clay under different minor principal stresses and negative temperatures
MA Qinyong1，2，3，ZHANG Hongpeng1，2，3，HUANG Kun4，MA Dongdong1，2，3，YAO Zhaoming1，2，3，WU Fei1，2，3
(1. School of Civil Engineering and Architecture，Anhui University of Science and Technology，Huainan，Anhui 232001，China；
2. Engineering Research Center of Underground Mine Construction，Ministry of Education，Anhui University of Science and
Technology，Huainan，Anhui 232001，China；3. State Key Laboratory of Mining Response and Disaster Prevention and
Control in Deep Coal Mine，Anhui University of Science and Technology，Huainan，Anhui 232001，China；
4. School of Civil Engineering，Anhui Jianzhu University，Hefei，Anhui 230009，China)
Abstract：Aiming at the plane strain problem in freezing method construction，the plane strain tests were carried out by using the improved true triaxial apparatus of frozen soil in Anhui University of Science and Technology. Subsequently，the strength and deformation of frozen silty clay were analyzed under different principal stresses and temperatures. Based on Weibull distribution and Drucker-Prager strength criterion，a damage constitutive model was established for frozen silty clay. The theoretical and experimental results demonstrate that the stress-strain curves under different minor principal stress exhibit different degrees of hardening characteristics at the same negative temperature. The failure strength increases first and then decreases with the increase of the minor principal stress，while it increases linearly with decreasing temperature. The established nonlinear Mohr-Coulomb strength criterion can describe the nonlinear correlation between the strength of frozen silty clay and the minor principal stress. Under different test conditions，the strain along the minor principal stress is expansion deformation，and the volume strain exhibits shear contraction. As the minor principal stress increases，the deformation modulus of the sample increases first and then decreases. For the same minor principal stress，the deformation modulus exhibits a negative correlation with temperature. Under the same temperature，the intermediate principal stress at failure also increases first and then decreases with increasing minor principal stress. The performed analysis revealed that the established damage constitutive model effectively considers the influence of minor principal stress and temperature on the strength and deformation of frozen silty clay under complex stresses.
马芹永1，2，3，张鸿朋1，2，3，黄 坤4，马冬冬1，2，3，姚兆明1，2，3，吴 飞1，2，3. 不同小主应力和负温条件下冻结粉质黏土平面应变试验研究[J]. 岩石力学与工程学报, 2024, 43(3): 768-780.
MA Qinyong1，2，3，ZHANG Hongpeng1，2，3，HUANG Kun4，MA Dongdong1，2，3，YAO Zhaoming1，2，3，WU Fei1，2，3. Experimental study on plane strain of frozen silty clay under different minor principal stresses and negative temperatures. , 2024, 43(3): 768-780.
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2024, Vol. 43 
