摘要
为了了解隧道侧部存在溶洞对围岩稳定性的影响,采用数值模拟的方法从水平应力、塑性区、位移量等方面综合分析得出:溶洞对隧道的影响距离约为溶洞半径的2~3倍;侧部存在溶洞将影响隧道两侧的水平压力分布,会使得无溶洞一侧的水平压力及位移增加;随着溶洞与隧道之间距离的增加,塑性区的体积呈峰值曲线变化,溶洞对隧道的影响将逐渐较小;溶洞会影响隧道顶部沉降和底部回弹变形趋势,造成隧道竖向净空高度进一步减小,给隧道的建设和运营将带来一定的危险性。
In order to understand the influence of karst caves on the stability of surrounding rock in the side of the tunnel, numerical si-mulation methods are used to analyze the horizontal stress, plastic zone and displacement. The in-fluence of the cave on the tunnel is about 2~3 times of the radius of the cave;the presence of the cave in the side will affect the horizontal pressure distribution on both sides of the tunnel, which will increase the horizontal pressure and displacement on the side without the cave;As the distance between the cave and the tunnel increases, the volume of the unstable area shows a peak curve, and the influence of the cave on the tunnel will gradually decrease. The existence of the cave will increase the amount of top settlement and bottom rebound, resulting the vertical clearance height of the tunnel is further reduced, which will bring certain risks to the construction and operation of the tunnel and should be taken seriously.
作者
许培
韩龙飞
高华光
Xu Pei;Han Longfei;Gao Huaguang(College of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000,China)
出处
《湖南文理学院学报（自然科学版）》
CAS
2019年第3期51-56,共6页
Journal of Hunan University of Arts and Science(Science and Technology)
关键词
岩溶
隧道稳定性
数值模拟
karst
tunnel stability
numerical simulation
