【作者】 齐春； 何川； 汪冬兵； 胡雄玉；

【Author】 QI Chun;HE Chuan;WANG Dongbing;HU Xiongyu;MOE Key Laboratory of Transportation Tunnel Engineering,Southwest Jiaotong University;

【机构】 西南交通大学交通隧道工程教育部重点实验室；

【摘要】 以神华新街台格庙煤矿TBM斜井工程为依托,采用数值计算手段对煤矿斜井深埋段围岩压力拱的确定进行了初步探讨。研究考虑了单一地层、软硬不均复合地层和穿越煤层段等工况,压力拱体范围以斜井洞室拱顶上方的为代表。研究表明:对于洞室拱顶而言,压力拱内边界为最大主应力出现位置,外边界为最大主应力方向发生偏转的位置。当围岩等级处于条件较好时,拱体内边界位于洞周;压力拱外边界距拱顶约0.85D。当围岩等级降低时,由于洞室开挖引起的应力重分布需要调用更大范围的围岩进行承载,使得压力拱边界远离洞室断面。当斜井洞室埋深较大时,软硬不均对压力拱的影响有限。斜井断面范围内存在煤层时,会使压力拱体厚度增大。研究结果可为深埋隧道、井巷等工程的设计提供参考意义。更多还原

【Abstract】 Basedon the shield inclined shafts of Shenhua Xinjie Taigemiao Coal Mine Project,the determination of pressure arch around the caverns is studied employing numerical simulation method.Single stratum,uneven hardness compound strata as well as coal seam are considered in this paper,and the region of pressure arch upon the crown is taken as the representative in the study.The results show that for pressure arch upon the crown,the inner boundary can be defined as the position where the maximum principal stress exists,as the outer boundary can be defined as the position where the maximum principal stress direction-deflexion exists.When the surrounding rock grade is good,the inner arch boundary is at the cavern perimeter,and the outer boundary is about 0.85 D away from the cavern crown.When the rock grade goes worse,the stress redistribution caused by the cavern excavation needs a larger range of surrounding rock,which makes the pressure arch boundary far away from the tunnel section.For compound strata,the uneven hardness has limited effects on pressure arch for deep-buried shafts.The existence of coal seam in cavern section causes the increase of pressure arch thickness.The results can provide references for the design of deep-buried tunnel,shaft or drift.更多还原