CAJ | 학술논문

向家坝水电站一期蓄水后，刚刚完成挖填方工程的307省道复建公路所途经的观音坪滑坡发生明显变形，滑坡变形究竟是蓄水触发还是复建公路施工触发存在着较大争议。本文基于滑坡变形特征与现场监测结果，探讨了该滑坡的变形机制。通过有限元数值模拟对该滑坡的稳定性进行分析，采用强度折减法计算出不同工况下滑坡的安全系数。计算结果表明：（1）复建公路施工和库水位上涨都不利于滑坡整体稳定，而且库水位上涨对滑坡稳定性的影响程度更大；（2）施工结束，且水库蓄水至354m后，滑坡已接近临界稳定状态；如不采取措施，库水位上升至二期蓄水位370m和正常蓄水位380m时，安全系数将进一步降低；（3）对该滑坡采取削坡减载治理措施后，滑坡在二期蓄水位和正常蓄水位的条件下安全系数均满足规范的要求，分析成果可为同类滑坡防治提供参考。
향가패수전참일기축수후，강강완성알전방공정적307성도복건공로소도경적관음평활파발생명현변형，활파변형구경시축수촉발환시복건공로시공촉발존재착교대쟁의。본문기우활파변형특정여현장감측결과，탐토료해활파적변형궤제。통과유한원수치모의대해활파적은정성진행분석，채용강도절감법계산출불동공황하활파적안전계수。계산결과표명：（1）복건공로시공화고수위상창도불리우활파정체은정，이차고수위상창대활파은정성적영향정도경대；（2）시공결속，차수고축수지354m후，활파이접근림계은정상태；여불채취조시，고수위상승지이기축수위370m화정상축수위380m시，안전계수장진일보강저；（3）대해활파채취삭파감재치리조시후，활파재이기축수위화정상축수위적조건하안전계수균만족규범적요구，분석성과가위동류활파방치제공삼고。
The Guanyinping landslide turned up evident deformation.There were two possible cause factors.One is the first-stage impoundment of Xiangjiaba hydropower station and the other is the rebuilding construction of the the 307 provincial road whose cutting and filling project had just been finished.The real cause triggering the landslide deformation remains to be controversial between the reservoir impoundment and the construction of the rebuilt road. Based on the landslide deformation behaviors and the results of in-situ monitoring,the deformation mechanism of the landslide is discussed specifically in this paper.In order to analyze the stability of the landslide,a 2D model is developed by using the finite element numerical simulation.The factors of safety under various operational conditions are calculated through shear strength reduction method.The result shows the following three points:(1) Construction of the rebuilt road and the rising of reservoir water level are both against the whole stability of the landslide,especially the rising of reservoir water level;(2)After the construction of the rebuilt road and the first-stage impoundment,the landslide is in the critical stable state.Supposing no reinforcement measure is taken,the factor of safety reduces continually under the second-stage impoundment and the normal impoundment;(3 )The treatment measure of cutting slope and unloading is presented.The factor of safety can meet the requirements of norms under the second-stage impoundment and the normal impoundment after being controlled.The relevant conclusions and methods proposed can provide the references for the treatment for the similar landslides.