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    2. 強涌水隧道長距離反坡施工及涌水處治關鍵技術研究
      • 作者: 夏邵君,黨亮
      論文摘要

      強涌水隧道長距離反坡施工及涌水處治關鍵技術研究

      夏邵君,黨亮

      (中交四公局第五工程有限公司,陜西 西安 710065)

      [摘要]以跑馬山2號隧道通風橫洞長距離大反坡施工中發生的圍巖脈狀高承壓涌水為工程依托,對深埋隧道長距離大反坡施工中高承壓水分布的特征、處治措施、施工關鍵技術、組織方式進行研究。結果表明,復雜環境及山體斷層和節理發育作用導致隧道圍巖結構裂隙水具有顯著的水量大、沿裂隙分布特征。大氣降雨、冰雪融水、地表溪溝、上部松散土類孔隙水等網狀水源補給條件引起隧道圍巖長期處于富水狀態,高水壓特征明顯。隧道掘進中出現的高承壓水與圍巖構造裂隙發育密切相關。隧道涌水沿掌子面噴出,總體呈“鉆孔時水量大、高承壓,爆破后水量減、水壓降”2個變化階段,而涌水位置則呈沿圍巖裂隙變化。結合實際開挖情況,涌水段圍巖采用三臺階先行導坑法施工,下臺階前方形成倒坡儲水載體及時跟進仰拱施工方法。

      [關鍵詞]隧道;強涌水;圍巖;降水;施工技術

      [中圖分類號]U455.1     [文獻標識碼]A     [文章編號]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

      [作者簡介]夏邵君,高級工程師,Email:1356931279@qq.com

       

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