考虑参数空间差异的复合式滑坡推力计算分析  

Computational analysis of composite landslide thrust considering spatial differences in parameters

作　　者：赵健[1] 姚嘉昊 ZHAO Jian;YAO Jiahao(School of Traffic&Transportation Engineering,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410114

出　　处：《铁道科学与工程学报》2024年第8期3189-3199,共11页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51878666);中铁二十一局集团科技开发项目(22C-6)。

摘　　要：由于复合式滑坡不同滑区同一岩土计算参数数值存在差异性,导致滑坡推力大小判别难度加大。根据复合式滑坡破坏模式,概化构建滑坡地质模型,在此基础上建立滑坡物理力学模型,并对各区参数进行理论分析。根据滑坡失稳特征以及前人对复合式滑坡演化阶段划分的研究,将滑坡演化过程划分为前后裂隙开裂、前后滑带局部软化、前后滑带扩展、中部滑带软化、边坡整体失稳5个阶段,基于传递系数法和静力平衡条件构建不同演化阶段下的滑坡推力计算式。以汉巴南铁路某复合式滑坡为例,揭示了滑坡推力随水平距离增加的变化规律,并将计算结果与不考虑不同滑区同一岩土计算参数数值差异得出的计算结果进行对比分析。研究结果表明:1)在计算复合式滑坡推力时,考虑不同滑区同一岩土计算参数数值差异性的影响,其计算结果更加准确,规避因单一取值而导致计算推力不合理等问题。2)根据复合式滑坡不同演化阶段下的推力变化规律,在滑坡初期应以推移区和牵引区加固为主,当中部锁固区开始滑动,应以中部锁固区加固为主,同时也要加强推移区和牵引区的加固。3)在识别复合式滑坡演化阶段的基础上,根据此阶段构建的滑坡推力计算式得出推力空间变化规律,从而可提出较为合理的防治措施。Due to the variability of the values of the same geotechnical calculation parameters in different landslide zones of composite landslides,it exacerbates the difficulty of discerning the size of landslide thrust.According to the damage mode of composite landslide,the geological model of landslide was constructed by generalization,on the basis of which the physio-mechanical model of the landslide was established,and the parameters of each zone were analyzed theoretically.According to the characteristics of landslide destabilization and the previous research work on the division of composite landslide evolution stages,the landslide evolution process was divided into five stages:front and back fissure cracking,front and back slip zone local softening,front and back slip zone expansion,central slip zone softening,and overall slope destabilization.The landslide thrust calculation formula under different evolution stages was constructed based on the transfer coefficient method and static equilibrium conditions.By taking a composite landslide of Han-Banan Railway as an example,it revealed the change rule of landslide thrust with the increase of horizontal distance,and compared and analyzed the calculation results with the calculation results derived from the numerical differences of the same geotechnical calculation parameters without considering different slip zones.The results show that:(1)when calculating the composite landslide thrust,by considering the influence of the difference in the value of the same geotechnical calculation parameter in different slip zones,the calculation results are more accurate and problems such as irrationality of the calculated thrust due to a single value can be avoided.(2)according to the different evolution stages of composite landslide under the change rule of thrust,in the early stage of landslide,the pushed area and traction area should be primarily reinforced.When the central locking area begins to slide,the central locking area should be mainly reinforced;meanwhile,the pushed area

关 键 词：复合式滑坡 演化过程 参数差异 传递系数法 推力计算 

分 类 号：P642.22[天文地球—工程地质学]