应变软化土坡渐进破坏的可靠度分析

发布时间：2018-01-18 00:28

本文关键词：应变软化土坡渐进破坏的可靠度分析　出处：《岩土力学》2015年S2期 　论文类型：期刊论文

【摘要】：在考虑土性参数的不确定性和土体应变软化特性的基础上,以可靠度方法建立了边坡渐进破坏的极限状态方程。通过计算边坡局部破坏概率,确定边坡中最危险的土条,并推导出破坏起始于该土条,逐渐向两侧扩展的渐进破坏概率计算公式。该方法能很好地反映边坡局部破坏的产生、扩展及对边坡整体稳定性的影响,找到最贴近实际情况的破坏传播路径,为边坡稳定分析提供了理论依据。通过算例分析可知,滑动面上各个土条的局部破坏概率均不相等,破坏起始于中部第8土条,破坏先向上传递,后向下传递至坡脚,并非从坡脚向坡顶传递的牵引式破坏,或从坡顶向坡脚传递的推移式破坏。
[Abstract]:On the basis of considering the uncertainty of soil parameters and the strain softening characteristics of soil, the limit state equation of progressive failure of slope is established by reliability method, and the local failure probability of slope is calculated. The most dangerous soil strip in the slope is determined, and the formula for calculating the probability of progressive failure, which starts from the soil strip and extends to both sides, is derived. The method can well reflect the occurrence of local failure of the slope. The extension and the influence on the whole stability of the slope can find the damage propagation path which is closest to the actual situation, which provides the theoretical basis for the slope stability analysis. The local failure probability of each soil strip on the sliding surface is not equal. The failure begins in the eighth soil strip in the middle. The damage is transmitted up first, then down to the foot of the slope, not the traction failure from the foot of the slope to the top of the slope. Or transmissible from the top to the foot of the slope.
【作者单位】：浙江大学滨海和城市岩土工程研究中心;浙江大学宁波理工学院土木建筑工程学院;杭州绿城海企房地产开发有限公司;
【基金】：浙江省自然科学基金(No.Y1111240)
【分类号】：TU43
【正文快照】： 1引言可靠性理论在边坡稳定性分析中已有较多的研究及应用,大多都建立在传统的极限平衡的基础上,假定边坡破坏时滑动面上土体塑性区内各点剪应力同时达到抗剪强度,边坡呈现整体性破坏。但对土坡破坏外观或者破坏机制的研究都表明,土体的强度并非在整个滑裂面上同时发挥作用,而

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