隧道工程饱水充填型溶洞处理技术研究  

Research on Treatment Technology for Krast Cave with Abundant Ground Water in Tunnel Engineering

作　　者：马涛[1] 

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道工程学报》2010年第6期74-78,共5页Journal of Railway Engineering Society

基　　金：铁道部科技研究开发计划课题(2003G036)

摘　　要：研究目的:宜万铁路马鹿箐隧道"+978"大型富水溶洞充填物为饱水淤泥质粉质黏土夹碎石、块石及孤石,颗粒细、含水量高、强度低、施工风险大。通过本研究,拟找到一个安全可靠、结构合理的支护体系。研究结论:(1)超前帷幕注浆能够起到改良土体、堵水的效果,对充填型溶洞加固效果显著,可以大幅度降低充填物含水率、改善物理力学指标,为顺利开挖创造有利条件,是溶洞处理有效的手段;(2)溶洞段采用双层喷混凝土支护形式的初期支护,有效控制了围岩变形,分担了大部分围岩压力,大大降低了传递至二次衬砌上的荷载;(3)鉴于岩溶水的季节性很强,在雨季地表强降雨的补给下,溶洞内水位会短时间内急剧上升,因此隧道二次衬砌应预留抵抗高水压的安全储备,以保证运营安全。Research purposes： The huge krast cave with abundant ground water of Malujing Tunnel of Yichang - Wanzhou Railway is filled with saturated silt and silty clay mixed with gravel, rubble and boulder, featured with small particle, high water content, low strength and high construction risk. The research is done on the treatment technology to seek one bracin~ system with high safety and reasonable structure.Research conclusions： （ 1 ） Curtain pre - grouting to the krast cave can improve the soil, block the water, much reduce the water content of filling materials, improve the physical and mechanical performances, create the favorable conditions for excavation, and achieve the good effect of reinforcing the karst cave, so it is an effective to treat the karst cave. （2） Application of the primary support of the double -layer shotcrete support structure to the karst cave can effectively control the deformation of the surrounding rock, bear the most pressure of the surrounding rock and much reduce the loading on the secondary lining. （3） In consideration of the high seasonality of karst water, the water level in the karst cave will much raise raoidlv due to heavy waterfall in the rain season, so the secondary lining of the tunnel should have excellent capacity of resisting the high - pressure water to guarantee the safe service of the tunnel.

关 键 词：隧道工程 溶洞 注浆加固 支护结构 

分 类 号：U457.2[建筑科学—桥梁与隧道工程]