宝成铁路K227+404～+467大型岩质崩塌破坏机制分析

崩塌是山区最为常见的地质灾害之一，以2018年7月12日发生于宝成铁路乐素河-王家沱区间K227+404～+467段大型岩质崩塌为研究背景，采用理论分析与Midas-GTS 有限元软件模拟相结合的方法对不同工况下崩塌体的整体稳定系数、坡体位移、塑性应变等响应进行了计算，研究了崩塌体空间结构形态和破坏机制。研究发现该崩塌发生是由3组节理面组成的“V”型楔形体在降雨影响下后缘结构面发生拉张破坏，底座结构面发生剪压破坏而形成的大型滑移式崩塌灾害。

Analysis on Destruction Mechanism of Large Rock Collapse of Baoji—Chengdu Railway K227+404 ~ +467

Collapse is one of the most common geological hazards in mountainous area. The rock collapse in the Lesuhe—Wangjiatuo region (K227+404～+467) of the Baoji-Chengdu Railway took place in July 12, 2018 was studied as a subject. The overall stability factor, slope displacement and plastic strain of the collapse under different working conditions were calculated by means of theoretical analysis and Midas-GTS finite element software simulation. The spatial structural morphology and destruction mechanism of the collapse were studied too. It is found that the collapse is a large sliding collapse caused by the tensile failure of the trailing edge structural surface of the "V" shaped wedge composed of three sets of joint surfaces and the shear failure of the base structure under the influence of rainfall.