An undrained expansion solution of cylindrical cavity in SANICLAY for K_(0)-consolidated clays  

作　　者：Haohua Chen Pin-Qiang Mo 

机构地区：[1]China University of Mining and Technology,Xuzhou 221116,China [2]The University of Arizona,Tucson,AZ 85716,USA

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2022年第3期922-935,共14页岩石力学与岩土工程学报（英文版）

基　　金：the funding support from National Natural Science Foundation of China (Grant Nos. 51908546 and 52178374);China Postdoctoral Science Foundation (Grant No. 2020T130699)

摘　　要：This paper proposes a rigorous undrained solution for cylindrical cavity expansion problems in K_(0)-consolidated clays,adopting a simple non-associated and anisotropic model,SANICLAY.The cavity expansion theory is well extended to consider non-associativity,K_(0)-consolidation and stress-induced anisotropy with combined rotational and distortional hardening of yield surface and plastic potential in the multiaxial stress space.The developed solution can be recovered for validation against the modified Cam-clay(MCC)solution by simply setting model constants,avoiding non-associativity and anisotropy.The source code is provided to facilitate the use for extensions.After investigating the effects of overconsolidation ratio on the cavity pressure curves,stress distributions,evolutions of anisotropic parameters and stress paths,the variations with three-dimensional(3D)evolutions of yield surface and plastic potential during undrained cavity expansion are shown for various K_(0)-consolidated clays.A parametric study on the model constants is presented to depict the influences on the stress distributions and paths,critical state surfaces and Lode’s angles at failure.The proposed solution also provides a general framework for formulating equations for undrained expansion of cylindrical cavities under an initial cross anisotropic condition using sophisticated anisotropic soil models.It serves as a precise benchmark for extensions of analytical solutions,numerical simulations of cavity expansion,and backcalculations of geotechnical problems.

关 键 词：Undrained cavity expansion SANICLAY K_(0)-consolidation ANISOTROPY 

分 类 号：TU43[建筑科学—岩土工程]