CAJ | 학술논문

牵引式滑坡在山区公路滑坡中占有相当的比重，其治理工程往往耗资巨大、环境破坏严重。针对某高速公路牵引式滑坡，通过地质调查、变形迹象分析、岩土体应力-应变分析及数值模拟等方法，指出具体破坏机制为：（1）坡脚开挖致使阻滑关键块体缺失，应力集中导致剪切应变软化；（2）地表降水与地下水对岩土体物理力学性能的改造；（3）滑体变形不协调，导致拉裂缝产生，滑坡后缘得以继续向后扩展。目前监测表明，已施工的组合加固措施效果良好。最后讨论挖方引起的牵引式滑坡的工程地质特征，对牵引式滑坡进行评价应坚持安全系数分区原则，滑坡总体加固应按安全系数控制，同时对后缘加固按位移控制。
견인식활파재산구공로활파중점유상당적비중，기치리공정왕왕모자거대、배경파배엄중。침대모고속공로견인식활파，통과지질조사、변형적상분석、암토체응력-응변분석급수치모의등방법，지출구체파배궤제위：（1）파각개알치사조활관건괴체결실，응력집중도치전절응변연화；（2）지표강수여지하수대암토체물리역학성능적개조；（3）활체변형불협조，도치랍렬봉산생，활파후연득이계속향후확전。목전감측표명，이시공적조합가고조시효과량호。최후토론알방인기적견인식활파적공정지질특정，대견인식활파진행평개응견지안전계수분구원칙，활파총체가고응안안전계수공제，동시대후연가고안위이공제。
The retrogressive landslide occupies a considerable proportion among expressway landslides in the mountain area. The reinforcement projects often cost enormously and the environment around is usually damaged severely. Taking a certain expressway retrogressive landslide for example, through approaches of geological survey, deformation investigation, stress-strain behavior analysis and numerical modeling, the failure mechanism is confirmed as follows:(1) the loss of resisting key block is caused by slope foot excavation, shear strain softening is induced by stress concentration;(2) physico-mechanical properties alternation of the rock and soil mass are remolded by the surface rainfall and groundwater;(3) tensile cracks are fromed deformation incompatibility and its expanding backward. The monitoring results show that the applied combined reinforcement measures work well. The geological characteristics of excavation-induced retrogressive landslides are discussed. A principle that“the safety factor should be calculated by section should use to evaluate retrogressive landslide; the reinforcement of the whole landslide should be controlled by the predetermined safety factor;while the reinforcement of landslide rear should be controlled by displacement.