隧道深埋富水滑动型软弱带突水突泥处理技术

摘要

研究目的：厦深铁路梁山隧道 DK 96＋505～DK 96＋530里程段发育有富水全～强风化花岗岩软弱带，长度25 m。该段隧道埋深270 m。软弱带呈陡倾状，倾角为75°～85°，两端为完整的花岗岩。软弱带沿隧道横向延伸长度约2．3 km。2009年3月14日，隧道开挖至软弱带时发生突水突泥，涌泥总量约3万 m3，淤积隧道长度230 m，致使地表塌陷200 m2，陷坑深度20 m。随后在隧道左侧设置迂回导坑，施工中再次发生突水突泥，使地表陷坑加剧，施工受阻。因此，必须研究施工技术方案处理该深埋富水滑动型软弱带。研究结论：（1）针对深埋富水滑动型软弱带突水突泥，采用“排水降压、旋喷加固、超前管棚”综合处理方案是可行的；（2）针对大跨度复杂地质隧道，采用“高扬工法”，施工期间总变形量约2 mm，该工法安全可靠，施工相对简单；（3）该研究成果可用于隧道深埋富水滑动型软弱带的处理。%Research purposes:DK 96 +505 ~DK 96 +530 paragraph of Liangshan tunnel on Xiamen -Shenzhen Railway developed water rich granite weak zone in which the length is 25 m,buried depth is 270 m.The weak zone is steeply inclined with a dip angle of 75 degrees to 85 degrees,and the two ends are complete granite.The lateral extension length of the weak zone is about 2.3 km.On March 1 4,2009,when the tunnel excavated to the weak zone, water and mud bursting occurred,mud total is about 30 thousand m3 ,and siltation tunnel length is 230 m,resulting in surface collapse 200 m2 and pit depth of 20 m.Then set the circuitous heading at the left side of the tunnel,water gushing occurred again in the construction,the construction was blocked.Therefore,it is necessary to study the construction technology scheme to deal with the deep water rich sliding type weak zone. Research conclusions:(1 )For deep water slide type soft with water and mud bursting,the comprehensive treatment scheme of "drainage and pressure lowering,grouting reinforcement,advanced pipe shed"is feasible.(2)For a large span tunnel,the "Gaoyang construction method"is adopted,the total deformation during construction is 2 mm,this method is safe and reliable,and the construction is relatively simple.(3)The research results can be used for the treatment of water rich sliding weak zone on tunnel.