Stability analysis of shield operation based on expansive geotechnical environment

摘要

In order to more accurately understand the stability of shield operation in expansive geotechnical environments. In this study, the stability of shield operation in expansive geotechnical environment is studied by ABAQUS software model construction and numerical simulation. The results show that when the support force ratio is lower than 0.2, the sedimentation begins to increase rapidly, and the expansion of the expansive geotechnical soil increases the degree of surface subsidence, which is very unfavorable to the stability of the support force. It can be seen that the ultimate support force ratio is about 0.2. In summary, as the depth of burial increases, the ultimate support force of the ground continues to increase; and as the cohesion and elastic modulus continue to increase, the ultimate support force of the excavation face of the soil continues to decrease. The change of water content affects the minimum support force of soil limit, but when the change of water content increases to a certain value, its initial influence on the limit support force of soil begins to decrease. The analysis of this research provides a reference for the study of the stability of subsequent expansive ground.