%0 Journal Article
%A LI He-zhi
%A ZHAO Yong-qing
%A CHEN Chun-ming
%T Depth of Driven Excavations in Foundation Pit Based on Limit Analysis Method
%D 2015
%R 10.11988/ckyyb.20140206
%J Journal of Yangtze River Scientific Research Institute
%P 99-103
%V 32
%N 9
%X According to upper bound theorem of the limit analysis method, we analyzed the velocity field at the bottom of active slip zone <i>ABC</i> and transition zone <i>BCD</i> and passive slip zone <i>BDE</i> in a foundation pit. Virtual work-rate equation of plastic area at the bottom of the foundation pit was established. On this basis, the upper-bound solution to the depth of support excavations which meets the requirement of stability against upheaval was induced, and the stability safety factor <i>k</i> was solved when the support depth <i>t</i> was given. Engineering examples verified that the upper-bound solution and the formula of stability safety factor <i>k</i> are rational. The results could provide reference for the calculation of support depth in similar foundation pits, and improve the correctness of bottom soil stability in foundation pit.
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20140206