徐州地铁1号线岩溶处理设计与施工

Design and Construction of Karst Treatment on Xuzhou Metro Line 1

徐州地铁1号线东西向贯穿徐州市,工程地质复杂,大范围穿越灰岩层,灰岩地带岩溶发育。在岩溶发育地段,隧道施工易发生塌方及涌水等事故;若岩溶处理不当,如底板下空洞未填充处理,造成地层承载力不够,给后期地铁运营造成了相当大的安全隐患。由于徐州及周边地区尚无地铁修建的经验,对该地区的岩溶发育特点及分布规律也未进行过研究,因此亟需一套有效的岩溶探测、处理方案解决施工中遇到的岩溶问题。通过先期开展设计和施工的1号线试验段,结合现场施工遇到的问题及岩溶揭露情况,研究出适用于徐州灰岩地区的岩溶处理方法,并总结出徐州地区岩溶发育特点及分布规律,可对徐州1号线全线及类似工程提供经验参考。

Xuzhou Metro Line 1 passes through Xuzhou city from west to east,the engineering geologic condition is very complicated,the limestone is widely distributed and Karst is well developed.In the Karst area,collapse,water inflow and other accidents are apt to occur. If the treatment measure for Karst is not sufficient,such as the unfilled cavity under tunnel floor will decrease the stratum bearing capacity,and then will affect metro operation. There is no experience of metro construction in Xuzhou before,the features and distribution law of Karst in this region has not been studied. So we need a valid Karst detection and treatment program to address the problems encountered in the construction of Karst tunnel. We studied on Xuzhou Metro Line 1 experimental section,and combined with problems and Karst encountered in the construction. Valid Karst treatments are developed and the features and distribution law of Karst in Xuzhou are summarized,which will provide a reference to Xuzhou Line 1 and other similar projects.