摘要
煤矿开采后采空区上覆岩层变形是一个长期过程,往往严重影响后期穿越采空区隧道的施工建设和长期运营。新建桑掌隧道是穿越采空区的典型案例,准确预测采空区残余变形对隧道的影响是保障工程安全的关键。本文采用玻兹曼函数对等价变采厚概率积分法进行优化,并引入时间函数,提出一种改进的变采厚概率积分法。采用该方法对山西省阳泉二矿4个停采时间不同的采空区在2020年之后的残余变形量进行了预测,并分析了采空区残余变形对桑掌隧道的影响。研究结果表明,新建桑掌隧道线路上的最大残余沉降量为325 mm,出现在隧道中段;最大残余侧向位移为168 mm,出现在隧道起点附近。由于隧道轴线与其中3个工作面的长轴方向小角度相交,隧道呈现出侧向移动、竖向下沉与轴向扭转的复合变形趋势。本文的计算结果可为桑掌隧道施工和变形处治提供科学依据,计算方法可为穿越采空区隧道建设提供理论支撑。
The deformation of overburden strata in goaf is a long-term process,seriously affecting the construction of tunnels that pass through the mining-induced subsidence zone.The Sangzhang tunnel is a typical case.Accurate predicting the influence of the residual deformation of goaf to Sangzhang tunnel is crucial to ensure its engineering safety.In this paper,a Boltzmann function is used to optimize the probability integral model of equivalent variable mining thickness,and a time function is introduced to put forward an improved model.We employ this modified model to predict the residual deformation of the four mining-induced subsidence zones in the Yangquan No.2 Mine,Shanxi Province,and then analyse the influence of the residual deformation of goaf to Sangzhang tunnel.The study indicates that the maximum residual settlement on the planned line of Sangzhang tunnel is 325 mm,appearing in the middle of the tunnel;the maximum residual lateral displacement is 168 mm,occurring near the start of the tunnel.As the axis of the Sangzhang tunnel intersects with the long axis of the mining-induced subsidence zone at a small angle,the tunnel shows a compound deformation trend of lateral movement,vertical settlement and axial torsion.Results in this paper can provide a scientific basis for the construction and deformation treatment of Sangzhang tunnel,and the adopted method can provide a theoretical support for the construction of tunnels that pass through mining-induced subsidence zones.
作者
李金洋
臧明东
徐能雄
秦严
陈宇
LI Jinyang;ZANG Mingdong;XU Nengxiong;QIN Yan;CHEN Yu(School of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083,China)
出处
《工程地质学报》
CSCD
北大核心
2021年第2期564-574,共11页
Journal of Engineering Geology
基金
国家自然科学基金(资助号:41772326)
中央高校基本科研业务费专项资金项目(资助号:292019008)
山西交通控股集团有限公司科技项目(资助号:19-JKKJ-10)。
关键词
桑掌隧道
采空区
概率积分法
时间函数
残余变形
Sangzhang tunnel
Goaf
Probability integral method
Time function
Residual deformation
