摘要
长春轨道交通某暗挖隧道穿越富水裂隙地层,制订技术方案前,借助构建流固耦合数值计算模型,对注浆止水加固圈的厚度进行了优化。通过工程现场试验证明:当加固圈厚度增加,拱顶沉降量和渗漏水量呈下降趋势,当隧道周围注浆加固区域厚度达到5 m后,拱顶沉降和渗水量下降趋缓;随着注浆止水加固圈渗透率越来越高,加固圈注浆效果越来越好。结合数值模拟分析结果与施工成本,该项目确定富水裂隙地层注浆止水加固圈最佳厚度为5 m,可满足初期支护防水要求。
Some undercut tunnel of Changchun Rail Transit crosses water-rich fractured stratum. Before formulating the technical scheme, the thickness of grouting water stop reinforcement ring is optimized through establishing a fluid solid coupling numerical calculation model. The field test of the project shows that when the thickness of the reinforcement ring increases, the settlement and the seepage amount of the vault show a downward trend;when the thickness of the grouting reinforcement area around the tunnel reaches 5 m, the settlement and seepage amount of the vault decrease slowly;with the increasing permeability of the grouting water stop reinforcement ring, the grouting effect of the reinforcement ring is getting better and better. Combined with the results of numerical simulation analysis and construction cost, the project determines that the optimal thickness of grouting water stop reinforcement ring in water-rich fractured stratum is 5 m, which can meet the waterproofing requirements of initial support.
作者
金鑫
Jin Xin(The Third Engineering Co.,Ltd.of China Railway 18th Bureau Group,Zhuozhou,Hebei 072750,China)
出处
《中国建筑防水》
2023年第1期51-55,共5页
China Building Waterproofing
关键词
地铁
暗挖隧道
富水裂隙地层
注浆技术
注浆加固圈厚度
subway
undercut tunnel
water rich fractured stratum
grouting technology
thickness of grouting reinforcement ring
