切割作用下牵引式古滑坡复活机理:以国道S206古滑坡为例  

Resurrection Mechanism of Retrogressive Ancient Landslide under Cutting Action:An Example of an Ancient Landslide on National Way S206

作　　者：李侑军 张红日 朱真 李红明 曾铃 张永杰 LI You-jun;ZHANG Hong-ri;ZHU Zhen;LI Hong-ming;ZENG Ling;ZHANG Yong-jie(Guangxi Transportation Science and Technology Group Co.Ltd.,Nanning 530000,China;School of Naval Architecture,Shanghai Jiao Tong University,Shanghai 210009,China;Guangxi Geological Environment Monitoring Station,Nanning 530000,China;School of Civil Engineering,Changsha University of Science and Technology,Changsha 410083,China)

机构地区：[1]广西交科集团有限公司,南宁530000 [2]上海交通大学船舶海洋与建筑工程学院,上海210009 [3]广西壮族自治区地质环境监测站,南宁530000 [4]长沙理工大学土木工程学院,长沙410083

出　　处：《科学技术与工程》2023年第35期15002-15009,共8页Science Technology and Engineering

基　　金：2023年崇左市科技计划项目-中央引导地方科技发展资金项目(崇科2023ZY0504);交通部2022年度交通运输行业重点科技项目清单(2022-MS5-125);国家重点研发计划(2019YFC1509800);广西道路结构与材料重点实验室开放课题(2021gxjgclkf004)。

摘　　要：为研究切割作用下牵引式古滑坡复活机理,通过现场调研及地质勘测获得了国道S206古滑坡的地层结构特征、变形特征等,得到了古滑坡存在的有力证据,并对滑坡区进行了稳定性分析。结果表明:地质背景、勘察结果表明该古滑坡属牵引式古滑坡;区域结构破碎的岩体、软弱夹层为古滑坡的形成提供了物质基础,前缘深切沟槽提供了空间条件;降雨促使了古滑坡的复活,前缘切割作用是古滑坡复活的直接诱因;不平衡推力法分析结果表明该滑坡在降雨情况下属不稳定状态,监测结果显示古滑坡复活后处于蠕滑状态,雨季时进入变形滑动阶段。可见地质背景是牵引式滑坡形成的内因,降雨、前缘切割是牵引式古滑坡复活的外因。In order to study the resurrection mechanism of retrogressive ancient landslide under cutting action,geological investigation and geological survey were used to investigate the stratigraphic structure characteristics and deformation characteristics of an ancient landslide in National Way S206.The evidence of the existence of ancient landslides was obtained by rock core.Stability analysis of landslide area was done by the investigation results.The analysis shows these as follows.Broken rock mass and weak interlayer in the regional structure provide the material basis for the formation of the retrogressive ancient landslide,and the front deep incision groove provide the space conditions.Rainfall promotes the formation of the ancient landslide revival,and the leading edge cutting is the traction effect.The calculation results show that the landslide is in an unstable state under rainfall conditions.The monitoring results show that the ancient landslide is in a creeping state after its resurrection,and enters the deformation and sliding stage in the rainy season.It is concluded that the geological background is the internal cause of the formation of the retrogressive ancient landslide,and the rainfall and the front edge cutting are the external causes of the resurrection.

关 键 词：岩土工程 工程地质 滑坡 牵引式古滑坡 切割作用 卸荷效应 降雨触滑 

分 类 号：P642[天文地球—工程地质学] TU357[天文地球—地质矿产勘探]