摘要
以赤水市旺隆边坡为工程实例,依据野外调查和地质分析成果建立平缓反倾红层边坡概念模型,并结合离散元数值模拟研究贵州平缓反倾红层边坡的变形破坏机制。结果表明:旺隆边坡是砂泥岩不等厚互层的典型平缓反倾红层边坡,差异风化和降雨是主要的诱发因素。边坡的变形演化过程经历4个阶段:卸荷回弹、浅表生改造-局部变形、裂隙扩展延伸、裂隙贯通深部蠕滑。变形破坏机制根据不同变形阶段划分为3种不同形式:压缩-拉裂-倾倒、风化剥落-坠落、蠕滑-压致拉裂。
An engineering example of Wanglong slope with gently anti-inclined red bed was studied.A conceptual model was first established based on the results of field investigation and geological analysis. Then the deformation and failure mechanism of gently anti-inclined red-bed slope in Guizhou was discussed through discrete element numerical simulation.The results show that Wanglong slope in Chishui City is a typical red-bed slope in Guizhou province with gently anti-inclined bedding and interbedded sand and mudstone of unequal thickness.Differential weathering and rainfall are the two important inducing factors for slope failure.The deformation process of the slope undergoes four stages,that is,unloading rebound,shallow epigenetic transformation and local deformation,fracture extension and propagation, fracture coalescence and deep creeping.The deformation and failure mechanism are divided into three different forms according to deformation stages:compression-cracking and dumping,weathering-spalling and falling,creeping-compression cracking.
作者
史文兵
李洪建
曾臻
梁风
王勇
SHI Wenbing;LI Hongjian;ZENG Zhen;LIANG Feng;WANG Yong(School of Resource and Engineering,Guizhou University,Guiyang 550025,China;No.4Team of Guizhou Non-ferrous Metals and Nuclear Industry Geological Exploration Bureau,Duyun 558000,China;School of Urban Construction,Guizhou Industry Polytechnic College,Guiyang 550081,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2018年第5期881-888,共8页
Journal of Disaster Prevention and Mitigation Engineering
基金
贵州大学引进人才科研项目(贵大人基合字(2017)77号)
贵州省交通运输厅科技项目(2016-123-029)
贵州省土木工程一流学科建设项目(QXNYL[2017]0013)
贵州省山地地质灾害防治工程技术研究中心项目(黔科合平台人才[2017]5402号)资助
关键词
平缓反倾
红层边坡
变形破坏机制
数值模拟
gently anti-inclined bedding
red-bed slope
deformation and failure mechanism
numerical simulation