边坡力的分布特征和稳定性分析

发布时间：2018-06-22 19:21

本文选题：力的分布 + 临界状态　；参考：《岩土工程学报》2017年07期

【摘要】：边坡在渐进破坏过程中,力的分布和稳定性分析是值得研究的。针对推移式和牵引式边坡,分别提出了5种破坏机理,根据边坡现状特征,提出了5种推移式边坡形式;定义了破坏方向,边坡渐进破坏的特征是处于峰值应力状态的地质材料,遵循材料的破坏规律,且一步一步向前移动,一点一点发生破坏;在破坏区,沿滑面的下滑力大于摩阻力,在临界状态,材料所承受的应力达到最大值,且矢量和等于零,在稳定区和欠稳定区下滑力等于摩阻力;在整个滑面,其压力等于反力。对于条块分析,边坡渐进破坏过程中,发生剪破坏时,临界状态存在力平衡,发生拉破坏状态时,存在力矩平衡;两种破坏形式在临界状态均是应力达到材料的极限值,且矢量和为零。提出了抗滑防护措施的刚性、柔性和刚柔性设计,并指明了相应的设置位置;定义了破坏率、破坏比、破坏面积比、力学破坏和工程破坏,并以此评价边坡的破坏程度。分析了力在边坡渐进破坏过程中的规律,提出了传统基于摩阻力和下滑力之比的稳定性系数定义是值得商榷的。并以实例证明主推力法(或主拉力法)、综合位移法、富余位移法和拉破坏法是可用于工程实践的。
[Abstract]:In the process of progressive failure, the analysis of force distribution and stability is worth studying. In this paper, five failure mechanisms are put forward for the bedload slope and the traction slope respectively. According to the current characteristics of the slope, five kinds of displacement slope forms are put forward, and the failure direction is defined. The characteristic of progressive failure of slope is that the geological material in the state of peak stress follows the law of material failure, and moves forward step by step, and the damage occurs at one point; in the failure area, the sliding force along the sliding surface is greater than the friction force, and in the critical state, The stress of the material reaches the maximum value, and the vector sum is equal to zero, the sliding force in the stable region and the unstabilized region is equal to the friction resistance, and the pressure is equal to the reaction force in the whole sliding surface. For strip analysis, in the process of progressive failure of slope, there is force balance in critical state, moment equilibrium in tensile failure state, stress in critical state reaches the limit value of material. And the sum of vectors is zero. The rigid, flexible and rigid flexible design of anti-slide protection measures is proposed, and the corresponding setting position is pointed out, and the failure rate, failure ratio, failure area ratio, mechanical failure and engineering failure are defined, and the failure degree of slope is evaluated. The law of force in the process of progressive failure of slope is analyzed, and the traditional definition of stability coefficient based on the ratio of friction and sliding force is put forward. It is proved by examples that the main push force method, the synthetic displacement method, the surplus displacement method and the tensile failure method can be used in engineering practice.
【作者单位】：湖北工业大学土木学院;三峡库区地质灾害防治工作指挥部;
【基金】：国家自然科学基金面上项目(41372363,41641027,50879044) 三峡后续工作地质灾害防治项目(0001212015CC60005))
【分类号】：TU43

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