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杜学才,龚振宇,肖钢,等. 上软下硬地层富水浅埋隧洞初支沉降及注浆止水防控技术[J]. 科学技术与工程, 2021, 21(19): 8218-8224.
Du Xuecai,Gang Zhenyu,Xiao Gang,et al.Grouting Water-stopping Technology and Primary Support Settlement of Shallow Buried Tunnel with Rich-water in Upper Soft and Lower Hard Stratum[J].Science Technology and Engineering,2021,21(19):8218-8224.
上软下硬地层富水浅埋隧洞初支沉降及注浆止水防控技术
Grouting Water-stopping Technology and Primary Support Settlement of Shallow Buried Tunnel with Rich-water in Upper Soft and Lower Hard Stratum
投稿时间:2020-12-25  修订日期:2021-04-21
DOI:
中文关键词:  隧洞  地表注浆  上软下硬  C-S双液浆  地表沉降
英文关键词:tunnel  surface grouting  upper-soft lower-hard ground  C-S double grout  ground settlement
基金项目:
              
作者单位
杜学才 云南省滇中引水工程有限公司
龚振宇 中铁五局集团电务城通工程有限责任公司
肖钢 中铁五局集团电务城通工程有限责任公司
冯志耀 中南大学土木工程学院
王树英 中南大学土木工程学院
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中文摘要:
      针对上软下硬地层中隧洞上台阶拱脚未坐落于基岩时,容易引起初支整体下沉、地表沉降过大等问题。以滇中引水龙泉隧洞出口段为工程背景,分析了隧洞开挖引起的沉降规律及原因,并进行了C-S双液浆胶凝试验和地表注浆现场试验,研究结果表明:地下水入渗是引起初支整体下沉和地表沉降过大的主要原因;上台阶开挖是引起地表沉降和拱顶沉降的主要阶段,约占各自沉降的68.01%和76.28%;基于双液浆胶凝试验和地表注浆现场试验,认为胶凝时间控制在25秒左右较为合理,采用地表注浆取得了较好的止水效果,地表沉降和拱顶沉降显著减小。
英文摘要:
      When the arch foot of the upper bench of the tunnel in the upper soft and lower hard strata is not located on the bedrock, it is easy to cause the overall settlement of the primary support and excessive surface settlement. The exit section of Longquan tunnel of central Yunnan provincial water diversion project was taken as engineering background, the law and reason of settlement caused by excavation was analyzed, and the C-S double grout gelation experimental and surface grouting field experiment was conducted. The research results show that groundwater infiltration is the main reason for the overall settlement of the primary branch and excessive surface settlement; and the upper bench excavation is the main stage that causes ground settlement and vault settlement, accounting for about 65.3% and 76.28% of the total settlement, respectively; Based on the C-S double grout gelation experimental and surface grouting field experiment, it is reasonable to control the gelation time about 25 seconds, a good water sealing effect was achieved by surface grouting, and the ground settlement and vault settlement were significantly reduced.
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