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  隧道 您当前位置:首页 > 隧道  
铁峰山2号隧道左线涌水段施工技术交底
点击率:1 资料整理: 来源:公路造价网 发布人:公路造价-冯 时间:2012-8-20
一、涌水情况概述
2004年9月24日,铁峰山2号隧道万州端左线ZK26+155处发生突水,突水点距洞口1918m,突水地层岩性为巴东三组三段的泥灰岩及白云岩,涌水量在9月25日左线约60327m³/d,9月26日左线约56415m³/d,直到10月19日涌水量有所减少,但左线仍有45000m³/d,水质清澈。
二、涌水段工程地质
1.地表水
隧道附近各溶洞、泉点、沟流水量变化不大,在背斜南翼没有溶洞。
2.地质雷达探测情况
地质雷达探测结果:左线出水点有一层间滑动的逆断层,地下清水是从左侧拱顶断层面溶层以瀑布形式向下倾泄。左线出水是局部滑动断层面不均匀溶蚀而形成的溶洞暗河所引起的。出水点前方60m范围内未发现其他溶洞。出水点左右上下发现一些以溶蚀层状形式出现的局部含水溶蚀层。
三、隧道过涌水段施工技术要求
1.施工原则
隧道过涌水段采取“以排为主,排堵结合”的施工原则,确保隧道施工安全进行。
2.施工方案要点
过隧道涌水段施工采取“对涌水段地层周边深孔注浆封闭岩溶缝隙,暂时将水汇集到隧道下部集中排放”的施工措施。
(1)施工步骤:
(2)注浆孔布置
注浆加固范围为开挖轮廓线外10m。注浆孔布置由工作面向开挖方向呈伞形辐射状,钻孔布置成数圈,梅花形排列,以达到注浆充分,不留死角的目的。
(3)注浆材料及配比
注浆材料选用水泥—水玻璃浆液。
参数如下:水泥:水玻璃(体积比)=1:(0.6~1.0);
水泥浆水灰比0.8:1~1:1;
水玻璃模数2.6~2.8,水玻璃浓度35Be。
3、隧道涌水段支护及防水措施
初期支护采用20cm厚的喷射砼,格栅钢架50cm/榀,辅以超前注浆小导管。二次衬砌按80cm厚预留位置,以便下一步处治。
加强隧道内临时排水,隧道内涌水应汇集到临时排水沟中,集中引出洞外。
四、施工注意事项
1.施工时应作好地质超前钻探,并随时观察掌子面的情况是否异常。超前钻的起点应在预测突水前5~10m处。
2.施工钻孔时,应密切注意孔内情况的变化,以便及时采取措施。
3.注浆时应根据浆液流动情况及围岩变化情况,及时调整浆液参数。
4.施工时应密切注意围岩及地下水的变化情况,加强监控量测,确保施工及结构的安全。
5.施工时应作好应付各种突发事件的准备。发现异常及时汇报,以便及时判断和处理。
 

 

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