CAJ | 학술논문

向家滑坡形成于南秦岭北大巴山构造带紫阳-平利滑脱逆冲推覆带。该滑坡位于局部南东倾向韧性剪切带之中。韧性剪切带以压扭性和张扭性为特征,经历了多期（次）活动,形成了二长岩脉和多期（次）石英脉的生成,韧性剪切带后期转化为脆性断层。因此,洪山镇向家滑坡的发生、发展与韧性剪切带和寒武系多期变形密切相关,高剪切应变带主要表现为岩石发生了强烈塑性变形,形成塑性流动构造;岩脉侵位,致使局部构造应力场中主应力方位σ1近于垂直,加上绢云母石英片糜岩中片理构造非常发育,绢云母和石英两类岩石力学性质差别很大的矿物均沿片理面集中分布,在雨水侵蚀过程中极易产生滑动而生成滑坡。
향가활파형성우남진령북대파산구조대자양-평리활탈역충추복대。해활파위우국부남동경향인성전절대지중。인성전절대이압뉴성화장뉴성위특정,경력료다기（차）활동,형성료이장암맥화다기（차）석영맥적생성,인성전절대후기전화위취성단층。인차,홍산진향가활파적발생、발전여인성전절대화한무계다기변형밀절상관,고전절응변대주요표현위암석발생료강렬소성변형,형성소성류동구조;암맥침위,치사국부구조응력장중주응력방위σ1근우수직,가상견운모석영편미암중편리구조비상발육,견운모화석영량류암석역학성질차별흔대적광물균연편리면집중분포,재우수침식과정중겁역산생활동이생성활파。
Xiangjia landslide is located at the Ziyang-Pingli detachment thrust belt,which belongs to South Qinling-North Dabashan tectonic zone.The landslide is imbricated into a southeast-vergent ductile shear zone which has experienced multi-time activity.The ductile shear zone has the characteristics of both twist-compression and twist-tension deformation,together with the appearance of Monzonlite dykes and quartz veins,finally turns into the brittle faults.Therefore,it is clear that the occurrence,development of Xiangjia landslide has the important relationships with regional ductile shear zone and Cambrian polyphase deformation.The characteristics take as follows： primarily,the rock has produced strong plastic deformation and formed plastic flow structure at the high shear strain zone.Moreover,the diapir emplacement makes the principal strain direction sigma 1 nearly vertical in a portion of the tectonic stress field.In addition,there are many schistosities extremely developing in the sericite-quartz phylonite;and the two minerals,mica and quartz,have the obviously distinctive mechanical properties,also distribute along the schistosity plane on a large scale.On top of this,sericite-quartz phylonite are inclined to slide in the rain erosion,given to the weather factor,and usually generate the larger landslide.