富水岩溶隧道衬砌结构水压力分布特征模型试验研究  

Model Test Study on Water Pressure Distribution Characteristics of Lining Structure in Water-Rich Karst Tunnel

作　　者：徐强 宋玉香[1,2] 樊浩博 谭信荣 杨海宏[1,2] XU Qiang;SONG Yuxiang;FAN Haobo;TAN Xinrong;YANG Haihong(Key Laboratory of Roads and Railway Engineering Safety Control,Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang Hebei 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang Hebei 050043,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu Sichuan 610031,China)

机构地区：[1]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043 [2]石家庄铁道大学土木工程学院,河北石家庄050043 [3]中国中铁二院工程集团有限责任公司,四川成都610031

出　　处：《中国铁道科学》2022年第4期74-83,共10页China Railway Science

基　　金：国家自然科学基金青年基金资助项目(52108378);河北省自然科学基金资助项目(E2020210068);河北省重点研发计划项目(21375403D);中铁二院工程集团有限责任公司院控项目(KYY2018071(18-20))。

摘　　要：为解决岩溶地区富水型隧道运营时易发生的衬砌病害,依托郑万高铁高家坪岩溶隧道设计优化排水方案,并开展模型试验研究;在考虑岩溶均质地层条件下不同水头高度带来影响的基础上,分不排水、常规排水和优化排水3种方案,揭示富水岩溶隧道分别沿纵向和断面的衬砌水压力分布特征。结果表明:常规排水和优化排水2种方案下,设置了纵向排水措施的各测点处衬砌水压力变化均不明显,但其余测点则越靠近环向排水管衬砌水压力越小,且环向排水管之间各测点处的纵向衬砌水压力呈倒“V”型分布;常规排水方案下,墙脚处水压力的优化效果最好,但仰拱中心处衬砌水压力较大且折减不明显,水压折减系数仅为0.1~0.15;优化排水方案下,不仅各测点处的衬砌水压力进一步减小,而且仰拱中心处折减明显,折减系数达0.9;优化排水方案对衬砌水压力有更好的优化效果,能够针对性地解决现有常规排水方案下隧道仰拱处水压较大的问题。In order to solve lining diseases prone to occur during the operation in tunnels of water-rich karst areas,an optimized drainage scheme was designed based on the Gaojiaping Karst Tunnel of Zhengzhou-Wanzhou high-speed railway,and a model test study was carried out.On the basis of considering the influence caused by different head heights in karst homogeneous stratum conditions,three schemes of no drainage,conventional drainage,and optimized drainage revealed the characteristics of lining water pressure distribution along the longitudinal and cross-sectional directions in water-rich karst tunnels.The results show that the lining water pressures at each monitoring point with longitudinal drainage measures barely change under the two schemes of conventional and optimized drainage.The lining water pressures at the remaining monitoring points decrease as the distance from the circumferential drainpipe decreases.And the longitudinal lining water pressures at each monitoring point between the circumferential drainpipe present an inverted“V”shape distribution.When the conventional drainage scheme is adopted,the optimization effect of water pressure at the foot of the wall achieves the best performance.However,the lining water pressure at the center of the inverted arch is large and the reduction is not obvious.The reduction factor of water pressure is only 0.1-0.15.When the optimized drainage scheme is adopted,not only the lining water pressure at each measuring point is further reduced,but also the reduction at the center of the inverted arch is obvious.The reduction factor of water pressure is up to 0.9.The optimized drainage scheme has a better optimization effect on the lining water pressure and can be targeted at solving the problem of high water pressure at the inverted arch of the tunnel with the conventional drainage scheme.

关 键 词：富水岩溶隧道 模型试验 水压力 分布特征 优化排水 水压折减系数 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]