• 学报（中文） •

### 方竖井基坑平动模式挡墙的主动土压力

1. 浙江大学 a. 滨海和城市岩土工程研究中心; b. 软弱土与环境土工教育部重点实验室, 杭州 310058
• 作者简介:应宏伟（1971-），男，江西省萍乡市人，副教授，主要从事土力学、地下工程等方面研究.E-mail：ice898@zju.edu.cn.
• 基金资助:
国家自然科学基金资助项目（51678523， 51278462， 51338009）

### Spatial Active Earth Pressure Against Translating Retaining Walls in Square Shaft Excavations

YING Hongwei,LIANG Wenpeng

1. a. Research Center of Coastal and Urban Geotechnical Engineering; b. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China

Abstract: In order to study the distribution of spatial active earth pressure against retaining walls in square shaft excavations, a 3-dimensional finite element analysis model of orthogonal rigid retaining walls is established, and the distribution of spatial active earth pressure and variation of the spatial slip block against translating retaining walls with different aspect ratios are studied. A theoretical model for determining spatial active earth pressure against translating rigid retaining walls with different aspect ratios is proposed. The definition of deep shaft excavations is given. The theoretical formulae for the resultant earth pressure and its acting point and the active earth pressure in the middle section of the wall are presented. Comparing the theoretical and numerical results, it is found that the two are in good agreement. The studies indicate that the spatial slip block consists of Coulomb’s active soil wedge in the middle of the wall and object with curved surfaces in the corner when the aspect ratio of the retaining walls is larger than the critical aspect ratio. When the aspect ratio of the retaining walls is less than the critical aspect ratio, it can be defined as a deep shaft excavations whose sliding block does not have straight section. As the decrease of aspect ratio, the active earth pressure coefficient decreases gradually from the Coulomb’s solution and the sliding angle increases.