D-P本构模型在某均质土坝稳定性分析中的应用

摘要

M-C模型是当前使用最为广泛的土体本构模型,但其未考虑中间主应力的影响,而中间主应力对计算结果影响较大. 基于有限单元法,采用考虑了中间主应力的D-P模型,对某竣工的均质土坝进行稳定性分析. 结果表明,D-P模型计算的安全系数比M-C模型计算结果更小,结果偏安全;大坝竣工后,发生了较大的水平和垂直位移,坝体表面材料处于受拉状态,应采取相应的处理措施. 为保障工程安全,建议在类似工程中采用D-P模型进行稳定性分析.%The M-C model is the most widely used constitutive model , but it did not consider the influence of intermediate principal stress , and the intermediate principal stress has a great influence on the calculation results.Based on the finite element method , using the D-P model considering the intermediate principal stress , the completion of a homogeneous earth dam stability are analyzed , re-sults show that:the safety factor calculation results of D -P model was smaller than the M -C mod-el, the calculation results of partial safety; when dam completed , the dam showed large horizontal and vertical displacement , the surface material was in tension , and should taken appropriate meas-ures to deal with.In order to guarantee the engineering safety , suggestions using the D -P model to analyze the stability in similar projects .