CAJ | 학술논문

永宁高速公路 K117滑坡路段原为在泥质粉砂岩单斜地层内开挖2级形成的路堑边坡，开挖后产生典型平面滑动，在中部滑床形成长约25m 的滑动槽，产生最远达35m 的远程滑距，其成因机制复杂。本文在对滑坡基本特征及孕育过程开展详细调查研究的基础上，采用节理有限单元法对该滑坡经路堑开挖导致高位坍滑、刷方变更后触发高速远程滑塌、滑塌后壁残留滑体牵引松动，以及对其实施卸载、支挡回填及锚固的治理过程开展数值模拟，再现了该滑坡孕育发展全过程及其稳定性演化规律；分析了该边坡破坏的平面滑动机构及滑动面的物理力学特征，论述了该类滑坡启动高速远程滑动的开挖松弛致滑机理和裂隙充水致滑机理，最后提出了预测及治理该类滑坡的6点建议。研究表明，在单斜地层开挖路堑，使顺倾向软弱结构面临空暴露时，可能诱发边坡整体卸荷松弛，产生较大的不平衡滑坡推力，而卸荷松动产生的张裂隙导致滑坡对降雨入渗十分敏感，不平衡力和裂隙水压力的共同作用可迅速剪断滑面，伴随势能向动能的转化，产生高速远程滑动。
영저고속공로 K117활파로단원위재니질분사암단사지층내개알2급형성적로참변파，개알후산생전형평면활동，재중부활상형성장약25m 적활동조，산생최원체35m 적원정활거，기성인궤제복잡。본문재대활파기본특정급잉육과정개전상세조사연구적기출상，채용절리유한단원법대해활파경로참개알도치고위담활、쇄방변경후촉발고속원정활탑、활탑후벽잔류활체견인송동，이급대기실시사재、지당회전급묘고적치리과정개전수치모의，재현료해활파잉육발전전과정급기은정성연화규률；분석료해변파파배적평면활동궤구급활동면적물리역학특정，논술료해류활파계동고속원정활동적개알송이치활궤리화렬극충수치활궤리，최후제출료예측급치리해류활파적6점건의。연구표명，재단사지층개알로참，사순경향연약결구면림공폭로시，가능유발변파정체사하송이，산생교대적불평형활파추력，이사하송동산생적장렬극도치활파대강우입삼십분민감，불평형력화렬극수압력적공동작용가신속전단활면，반수세능향동능적전화，산생고속원정활동。
K117 landslide of Yong-Ning highway is a cutting slope with two excavation stages in argillaceous siltstone of monoclinic layer.The formation mechanism of this landslide is complex because it is the long run-out plane sliding as far as 35m and the sliding pit as long as 25m on slide bed when excavated.Based on the detailed investigation to its basic characteristics and development process,the landslide is simulated by joint finite element method in the process of its slide of three stages and landslide treatment.Firstly,the paper reappears the whole gestating process and stability evolving regulations of the landslide.It analyzes the plane sliding mechanism and the physical and mechanical characteristics of sliding surface.Next,it discusses the long run-out sliding mechanism induced by excavating relaxation and filling water within fissure.Lastly,it proposes six suggestions to predict and control this landslide.The results shows that,when the weak structure planes in monoclinic layer is exposed on free surface after excavating,it can activate unloading relaxation of the whole slope and cause the great imbalance thrust of landslide.Meanwhile,landslide is very sensitive because of rainfall infiltration in stretched cracks.Due to change of potential energy to kinetic energy,sliding surface can be cut off rapidly by the interaction of imbalance thrust and fissure water pressure.Then it can be converted into high-speed and long run-out sliding.