Checking method for basal heave stability of deep excavation in saturated cohesive soil
Song Erxiang1,2 Fu Hao1,2 Li Xianjie1,2 Guo Hongxian1,2
1. School of Civil Engineering, Tsinghua University, Beijing 100084, China;
2. Key Laboratory of Civil Engineering Safety and Durability of the Ministry of Education, Tsinghua University, Beijing 100084, China
Abstract： For checking the basal heave stability of deep excavation in saturated cohesive soils, it is firstly clarified that the undrained strength shall be employed. Then an evaluation method for the ground bearing capacity is proposed in consideration of the approximately linear increase of the undrained strength with depth. Thereafter, the checking method is given for the basal heave stability of deep excavation in saturated cohesive soils by referring to the authors’previous studies. The proposed method is composed of the safety factor calculation in terms of ground bearing capacity for relatively small embedded depth of the supporting structure, the stability checking by assuming circular slip surface for relatively large embedded depth and the formula for determining the critical embedded depth beyond which the safety factor remains almost unchanged. By comparing with the refined numerical calculations, the proposed method was validated. Through the analyses of two practical projects involving layered ground of cohesive soil and cohesionless soil, the practical applicability of the proposed method was demonstrated.
宋二祥 付浩 李贤杰 郭红仙. 饱和黏性地层中基坑坑底抗隆起稳定验算方法[J]. 土木工程学报, 2021, 54(10): 97-105.
Song Erxiang Fu Hao Li Xianjie Guo Hongxian. Checking method for basal heave stability of deep excavation in saturated cohesive soil. 土木工程学报, 2021, 54(10): 97-105.
