Influence of stress anisotropy on the cylindrical cavity expansion in undrained elastic-perfectly plastic soil  

作　　者：ZHOU Hang LIU HanLong ZHA YaHui YIN Feng 

机构地区：[1]Key Laboratory of New Technology for Construction of Cities in Mountain Area,School of Civil Engineering, Chongqing University [2]State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology

出　　处：《Science China(Technological Sciences)》2018年第3期370-380,共11页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51420105013&51708063);the State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology(Grant No.SKLGDUEK1713);Chongqing Research Program of Basic Research and Frontier Technology(Grant No.cstc2017jcyjAX0261)

摘　　要：This work presents an analysis of the influence of stress anisotropy on cylindrical cavity expansions in an undrained elastic-perfectly plastic soil. This problem was formulated by assuming a large strain in both the elastic and plastic zones around the cavity and a plain strain condition during the cavity expansion process. The solutions for the limit pressure, stress, and excess pore pressure were obtained by introducing the anisotropic initial stress coefficient K_0 into the conventional cylindrical cavity expansion method.The proposed solutions were then used to interpret the piezocone penetration test, and the suitability of the solutions was verified by comparing the prediction with the piezocone penetration test data. Subsequently, parametric studies were carried out to investigate the influence of stress anisotropy on the stress, excess pores pressure distributions around an expanding cylindrical cavity, and limit pressure. The results show that the proposed cylindrical cavity expansion method under stress anisotropy is suitable and can be used to investigate the piezocone cone test. The present work improves upon the conventional theoretical framework of cavity expansion and can be applied to the determination of the stresses around axially loaded piles and around in-situ testing devices such as penetrometers.

关 键 词：anisotropy cylindrical cavity expansion undrained elastic-perfectly plastic 

分 类 号：O344.3[理学—固体力学]