Application research of soil strength criterion under plane-strain condition for loess problems
Zhang Yu1 Shao Shengjun2,3 Zhao Min1 Ding Xiao1 Liu Jin1 She Fangtao2,3
1. Xi’an Technological University, Xi’ an 710021, China;
2. Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an 710048, China;
3. Shanxi Key Laboratory of Loess Mechanics and Engineering, Xi’an University of Technology, Xi’an 710048, China
Abstract：In terms of the intermediate principal stress formula and the plane-strain strength criterion established from the strength criteria of Mohr-Coulomb, Matsuoka-Nakai, the spatially mobilized plane, Lade-Duncan and AC-SMP, the commonly encountered plane-strain loess problems, including the plane-strain upright excavation pit of loess, the earth pressure of retaining structure and the bearing capacity of strip footing, were analyzed and calculated. The results show that the spatial failure plane of the infinitesimal soil element described by the Lade-Duncan criterion is close to the spatially mobilized plane strength criterion; when applied to some specific loess problems, various strength criteria derived from the plane-strain condition may lead to big difference compared to the commonly used Mohr-Coulomb strength criterion, and the Mohr-Coulomb criterion is more conservative so that the loess strength is not fully exploited. In design of plane-strain loess works, the strength criterion suitable for loess shall be selected. Considering the contribution of intermediate principal stress to soil strength under the plane-strain condition, the original structural characteristics of loess shall be fully exploited, so that the economy in construction of works can be improved.
张玉 邵生俊 赵敏 丁潇 刘瑾 佘芳涛. 平面应变条件下土的强度准则在黄土工程问题中的应用研究[J]. 土木工程学报, 2018, 51(8): 71-80.
Zhang Yu Shao Shengjun Zhao Min Ding Xiao Liu Jin She Fangtao. Application research of soil strength criterion under plane-strain condition for loess problems. 土木工程学报, 2018, 51(8): 71-80.
