含软弱基座危岩体倾倒崩塌机制试验研究  

Experimental Study on Toppling and Collapse Mechanism of Dangerous Rock Mass with Weak Foundation

作　　者：曾茹梦 杨晓雨 张飞 ZENG Rumeng;YANG Xiaoyu;ZHANG Fei(Key Laboratory of the Ministry of Education for Road and Railway Engineering Safety Assurance,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043 [2]石家庄铁道大学土木工程学院,河北石家庄050043

出　　处：《石家庄铁道大学学报(自然科学版)》2025年第1期71-76,共6页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：河北省高层次人才资助项目(B2021003021)。

摘　　要：通过室内模型试验,深入探究了含软弱基座危岩体的倾倒崩塌机制。试验选取砂土模拟脆性基座、黏土模拟塑性基座,以红砖模拟上部结构。脆性基座模型试验中,随着倾斜角度增加,砂土基座因合力改变致使前缘压溃,出现贯通裂隙,上部结构崩塌,崩塌前缘压力变化明显,崩塌体位移呈“台阶状”且变形速率有3阶段特征。塑性基座模型试验里,倾角增大时黏土基座与上部崩塌体变形增大、后缘裂缝间距增大,最终崩塌,其基座压力变化与位置相关,崩塌体位移变化也具有3阶段特征。Through indoor model experiments,the toppling and collapse mechanism of dangerous rock masses with weak bases was explored.In the experiments,sandy soil was selected to simulate the brittle base,clay was chosen to simulate the plastic base,and red bricks were used to simulate the upper structure.In the model test of the brittle base,as the inclination angle increased,the sandy soil base collapsed at the front edge due to the change of the resultant force,resulting in a through crack.The upper structure collapsed,and the pressure change at the front edge of the collapse was significant.The displacement of the collapse body presented a“step-like”pattern with a three-stage deformation rate.In the model test of the plastic base,when the inclination angle increased,the deformation of the clay base and the upper collapse body increased,and the crack spacing at the rear edge increased.Eventually,the collapse occurred.The pressure change of the base was related to the position,and the displacement change of the collapse body also had a three-stage characteristics.

关 键 词：倾倒崩塌类危岩 破坏特征 脆、塑性基座 模型试验 

分 类 号：P642.21[天文地球—工程地质学]