折线型复合式滑坡渐进破坏稳定性状态的力学判别  

Mechanical discrimination of stability state of progressive failure of broken-line complex landslides

作　　者：杜毅 晏鄂川[1] 蔡静森 高旭[1] 柳万里[1] DU Yi;YAN Echuan;CAI Jingsen;GAO Xu;LIU Wanli(Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《岩土工程学报》2023年第6期1151-1161,共11页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(41972289,41807264)。

摘　　要：折线型复合式滑坡各区段岩土体性质及应力状态的差异加剧了稳定性判别的难度,以该类滑坡为对象,研究其渐进破坏稳定性状态演化的力学判别。结合滑带土应变软化特性构建滑坡力学模型,将其渐进破坏过程划分为8个演化阶段,并依据静力平衡条件及传递系数法建立与之对应的稳定性计算方程,以示滑坡渐进发展中由首尾向中部区段间的荷载传递机制,揭示滑坡局部和整体所受荷载、应力分布与稳定性状态间的量化差异及演变规律。研究结果表明:演化初期滑坡稳定性降幅较小,当渐进破坏发展至中部锁固段时,滑坡稳定性开始大幅衰减。处于滑坡自主助力阶段之前于首尾两端布设的防治工程将是节能高效的,若处于该阶段内则需结合扰动荷载传递位置及自主荷载积累的大小来判定防治部位,错过该治理关键阶段应考虑以锁固段的稳定为主。The difference in properties and stress states of soils in each section of a broken-line complex landslide exacerbates the difficulty of judging its stability.Taking this kind of landslide as the object,the mechanical discrimination of evolution of stability state of progressive failure is studied.Considering the strain-softening characteristics of soils in sliding zone,the mechanical model for the landslide is established,and its progressive failure process is divided into eight evolutionary stages.According to the static equilibrium principle and the transfer coefficient method,the relevant equation for calculating stability of each stage of the landslide is established.The load transfer mechanism between the front and rear to the middle section in the progressive development of the landslide is shown,and the quantitative difference and evolution law of the loads,stress distribution and stability states between the part and the whole of the landslide are revealed.The results show that the stability of the landslide decreases slightly at the initial stage of evolution,and when the progressive failure develops to the middle locking section,the it begins to decline greatly.The control projects laid at the front and rear before the self-imposed load stage of the landslide are energy-saving and efficient.If it is at this stage,the control position should be determined by combining the position of the equivalent load transfer and the accumulation of the self-imposed loads,and the stability of locking section should be considered when missing the key stage of control.

关 键 词：折线型复合式滑坡 应变软化 渐进破坏 荷载传递 稳定性状态 

分 类 号：TU43[建筑科学—岩土工程]