Improvement of calculation method for safety factor of#br#
basal heave stability of deep excavation
Song Erxiang1,2 Fu Hao1,2 Li Xianjie1,2
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：The calculation of safety factor with regard to basal heave stability of deep excavation is an importance issue in the design of excavation support system, in which it is difficult to consider the effect of the retaining structural embedment depth. In this paper, the drawbacks of the current calculation methods are thoroughly analyzed, and then a set of improved methods are presented based on deep thinking and a large amount of comparative computations. The proposed method is based on the modification of the existing methods, with clear indication being given with regard to the applicable conditions of different methods in terms of the embedment depth of the retaining structures. A formula is proposed to determine the critical value of embedment depth, beyond which the safety factor will remain unchanged, and the safety factor should be evaluated by using that critical value. Thus the calculation of base stability safety factor of deep excavations can be reliably conducted. By comparing with the results calculated by the more refined finite element method of limit analysis for various deep excavation projects, the rationality and applicability of the presented method are validated.
宋二祥 付浩 李贤杰. 基坑坑底抗隆起稳定安全系数计算方法改进研究[J]. 土木工程学报, 2021, 54(3): 109-118.
Song Erxiang Fu Hao Li Xianjie. Improvement of calculation method for safety factor of#br#
basal heave stability of deep excavation. 土木工程学报, 2021, 54(3): 109-118.
