武汉地铁隧道与隐伏溶洞的安全距离研究  

Safe Distance Between Subway Tunnel and Peripheral Karst Caves in Wuhan

作　　者：高坛 周传波[1] 屈若枫[1,2] 吴红博 GAO Tan;ZHOU Chuan-bo;Qu Ruo-feng;WU Hong-bo(Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;Wuhan Metro Group Co.,Ltd.,Wuhan 430030,China)

机构地区：[1]中国地质大学(武汉)工程学院,武汉430074 [2]武汉地铁集团有限公司,武汉430030

出　　处：《长江科学院院报》2018年第8期106-111,共6页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(41372313);武汉市"黄鹤英才(科技)计划"资助项目

摘　　要：武汉地区溶洞存在埋深较浅、溶洞高度较小、地下水"高水头"等特征。基于这些特征,利用MIDAS GTS进行数值正交试验,分析了武汉地铁27号线围岩水平、侧压力系数、溶腔跨度、溶腔高跨比、渗透系数等对隧道与溶洞安全距离的影响规律和显著性。研究结果表明:隐伏溶洞位于隧道下方、侧方或上方工况条件下,围岩水平、溶腔跨度均会对隧道与溶洞的安全距离有显著影响,而渗透系数对其并无显著影响;侧压力系数只在隐伏溶洞位于隧道下方时有显著影响;溶腔高跨比只在隐伏溶洞位于隧道侧方时有显著影响。结合试验结果的非线性多元回归分析,分别建立溶洞在隧道下方、侧方、上方时的隧道与溶洞安全距离预测模型;通过工程实例的检验与应用,该分析方法可靠合理,可为类似工程提供借鉴和参考。Karst caves in Wuhan are featured with shallow buried depth,small height,and high-head groundwater.Through numerical orthogonal test by MIDAS GTS,the significance of five major factors affecting the safe distance between the tunnel of Wuhan metro line 27 and the hidden karst caves is examined. The five major factors involve surrounding rock level,lateral pressure coefficient,span of cave,ratio of height to span of cave,and permeability coefficient. Results suggest that surrounding rock level and span of cave have significant impact on the safe distance between tunnel and cave whether the peripheral cave is located below,lateral to or above the tunnel,while permeability coefficient has no significant effect. Lateral pressure coefficient has a significant effect only when the peripheral cave is located beneath the tunnel. The ratio of height to span of cave has a significant influence only when the peripheral cave is located lateral to the tunnel. In association with nonlinear multiple regression analysis on the results,formulas for estimating the safe distance between tunnel and cave when caves are located below,lateral to and above tunnel are obtained. Case study proves that the proposed formulas are reliable.

关 键 词：隐伏溶洞 地铁隧道 安全距离 正交试验 方差分析 多元回归分析 

分 类 号：TU91[建筑科学—建筑理论]