摘要
基于理论分析和数值仿真,结合湖南省汝郴(汝城—郴州)高速公路K65+400—K65+690段吊坎垄峡谷隧道与桥梁搭接处的前缘锁固型高陡边坡的变形,对该边坡的失稳源、失稳机理和失稳过程进行综合分析。研究结果表明:该边坡浅层和中层的变形失稳机理为蠕滑—拉裂破坏,失稳源为前部破碎岩体;深层的变形失稳机理为滑移—拉裂—剪断“三段”式破坏,失稳源位于断层F13的中部;吊坎垄前缘锁固型峡谷边坡的深部主控结构面是近似平行于边坡坡面的顺坡向逆断层;起到锁固作用的坡脚岩体受结构面交叉分割,在自重应力场驱动下,结构面逐渐被破坏直至稳定状态,天然边坡浅层和中层处于欠稳定状态,深层处于稳定状态;受施工扰动触发,岩体内部结构面因损伤积累、抗剪强度弱化及应力集中等因素继续扩展,相应地,深部断层中部出现塑性区并具有累进性破裂和变形失稳的趋势。
Based on theoretical analysis and numerical simulation methods,focusing on the deformation of a leading-edge locking canyon slope at the overlap between the Diaokanlang Tunnel and the bridge on the K65+400—K65+690 section of the Ru—Chen(Rucheng—Chenzhou)Expressway in Hunan Province,the instability sources,mechanisms and processes were studied.The results show that the failure mechanism of the shallow and the intermediate landslides is creep and slip-tension,and the instability source is the fractured rock in the foreground of slope.The failure of the deep landslide is in a"three-stage"mechanism of slip—tension—shearing,and the instability source is located in the middle of fault F13.The main controlling structural surface in the deep of the slope is a fault that is approximately parallel to the slope profile,and the locking rock mass at the slope toe is cross-segmented by structural surfaces.Driven by the self-weight stress field,the structural surfaces are progressively damaged to a stable state,and the natural slope is unstable at shallow and intermediate depths while stable at deeper depths.Triggered by the construction disturbance,the internal structural surface of the rock mass continues to extend due to the damage accumulation,shear strength weakening and stress concentration,and plastic deformation occurs in the middle of the corresponding deep fault,showing a tendency of progressive rupture and destabilization.
作者
胡惠华
鲁光银
陈怡帆
尹湘杰
张鹏
林杭
陈昌富
HU Huihua;LU Guangyin;CHEN Yifan;YIN Xiangjie;ZHANG Peng;LIN Hang;CHEN Changfu(Hunan Provincial Communications Planning,Survey&Design Institute,Changsha 410200,China;School of Geosciences&Info-physics,Central South University,Changsha 410083,China;School of Resources&Safety Engineering,Central South University,Changsha 410083,China;School of Civil Engineering,Hunan University,Changsha 410082,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第11期4461-4471,共11页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(42277175,41974148)
湖南省交通运输厅科技进步与创新计划项目(201003,202120)。
关键词
峡谷
边坡失稳源
锁固段
演化过程模拟
canyon
instability source of slope
locking section
simulation of evolution process
