摘要
为了研究不均匀地应力环境下的圆形巷道损伤后的稳定性问题,将巷道围岩的应力场和考虑损伤效应的统一强度理论进行了关联分析,推导了非等压条件下的巷道围岩塑性区半径、位移及应力分布的解析解。通过具体算例,分析了侧压力系数、中间主应力、方位角及损伤特性对围岩变形的综合影响。研究结果表明:侧压力系数对巷道围岩塑性区的形状与尺寸具有显著影响,并且在不同方位角下,塑性区半径随侧压力系数的变化呈现不同的规律性特征,在工程实践中,可依据该规律针对性地指导巷道支护的形式与时机;随着中间主应力的增大,巷道围岩塑性区的半径和位移均呈现出减小的趋势;随着围岩损伤程度的加剧,塑性区的半径及位移均明显增大。
To investigate the stability of circular roadways under an uneven stress environment following damage,an analytical association between the stress field of the roadway surrounding rock and the unified strength theory considering damage effects was performed.Analytical expressions for the radius of the plastic zone,displacement,and stress distribution of the surrounding rock under conditions of non-uniform pressure were formulated and derived.Through specific case studies,the comprehensive impacts of the lateral pressure coefficient,intermediate principal stress,azimuthal angle,and damage characteristics on the deformation of the surrounding rock were analyzed.The findings indicate that the lateral pressure coefficient plays a critical role in shaping the geometry and dimensions of the plastic zone within the surrounding rock of the roadway.Furthermore,the variation of the plastic zone radius with the lateral pressure coefficient exhibits different patterns under varying azimuthal angles.These findings can provide targeted guidance for the form and timing of roadway support in engineering practice.Additionally,as the intermediate principal stress increases,both the radius and displacement of the plastic zone in the surrounding rock tend to decrease.Conversely,with the intensification of rock damage,the plastic zone radius and displacement both show a marked increase.
作者
经来旺
吕将
郑睿
崔子琦
经纬
JING Lai-wang;L Jiang;ZHENG Rui;CUI Zi-qi;JING Wei(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China)
出处
《科学技术与工程》
北大核心
2025年第25期10619-10627,共9页
Science Technology and Engineering
基金
安徽省博士后科研资助项目(2022B640)
国家重点实验室开放基金(SKLMRDPC19KF02)。
关键词
圆形巷道
损伤特性
统一强度理论
侧压力系数
中间主应力
circular roadway
damage characterization
unified strength theory
lateral pressure coefficient
intermediate principal stresses
