强涌水隧道长距离反坡施工及涌水处治关键技术研究
  • 作者: 夏邵君,党亮
论文摘要

强涌水隧道长距离反坡施工及涌水处治关键技术研究

夏邵君,党亮

(中交四公局第五工程有限公司,陕西 西安 710065)

[摘要]以跑马山2号隧道通风横洞长距离大反坡施工中发生的围岩脉状高承压涌水为工程依托,对深埋隧道长距离大反坡施工中高承压水分布的特征、处治措施、施工关键技术、组织方式进行研究。结果表明,复杂环境及山体断层和节理发育作用导致隧道围岩结构裂隙水具有显著的水量大、沿裂隙分布特征。大气降雨、冰雪融水、地表溪沟、上部松散土类孔隙水等网状水源补给条件引起隧道围岩长期处于富水状态,高水压特征明显。隧道掘进中出现的高承压水与围岩构造裂隙发育密切相关。隧道涌水沿掌子面喷出,总体呈“钻孔时水量大、高承压,爆破后水量减、水压降”2个变化阶段,而涌水位置则呈沿围岩裂隙变化。结合实际开挖情况,涌水段围岩采用三台阶先行导坑法施工,下台阶前方形成倒坡储水载体及时跟进仰拱施工方法。

[关键词]隧道;强涌水;围岩;降水;施工技术

[中图分类号]U455.1     [文献标识码]A     [文章编号]1002-8498(2021)18-0040-06

Research on Key Technology of Long Sistance Reverse Slope Construction and Water Gushing

Treatment of Strong Water Gushing Tunnel

XIA Shaojun, DANG Liang

(CCCC Fourth Highway Engineering Co., Ltd., Xian, Shaanxi 710065, China)

Abstract: Based on the pulse high pressure water gushing of surrounding rock during the construction of long distance large reverse slope of Paomashan No.2 Tunnel, the distribution characteristics, treatment measures, key construction technology and organization mode of high pressure water in the construction of long distance large reverse slope of deep buried tunnel are studied. The results show that the complex environment and the development of mountain faults and joints lead to the large amount of fissure water in the surrounding rock structure of the tunnel. The water supply conditions of the network water source, such as atmospheric rainfall, ice and snow melt water, surface gullies, upper loose soil pore water, cause the tunnel surrounding rock to be in water rich state for a long time, and the characteristics of high water pressure are obvious. The high pressure water in tunnel excavation is closely related to the development of structural fissures in surrounding rock. The tunnel water gushing out along the face of the tunnel, the overall situation is the amount of water during drilling is high and the pressure is under pressure, and the water quantity after blasting is reduced and the pressure drop. The water gushing position changes along the surrounding rock cracks. Combined with the actual excavation situation, the surrounding rock of the water gushing section is constructed by the three steps first heading method, and the inverted arch construction method is followed up in time with the inverted slope water storage carrier formed in front of the lower step.

Keywords:tunnels;strong water gushing;surrounding rock;dewatering;construction

[作者简介]夏邵君,高级工程师,Email:1356931279@qq.com

 

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