富水砂卵石地层土压平衡盾构隧道碴土改良试验研究  

Soil Conditioning Experiments for EPB Shield Tunneling in Water-Rich Sandy Cobble Strata

作　　者：胡长明[1] 张延杰[1] 谭博 穆世旭 梅源[1] 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]中铁一局集团城市轨道交通工程有限公司,西安710054

出　　处：《现代隧道技术》2017年第6期45-55,共11页Modern Tunnelling Technology

基　　金：国家自然科学基金青年科学基金项目(51408463);包头市科技计划项目(2011X1006);西安建筑科技大学科技计划项目(RC1375)

摘　　要：文章以成都地铁3号线盾构隧道工程为背景,进行针对性的富水砂卵石地层碴土改良试验。通过室内试验研究,得出改良剂的合理浓度配比以及在不同含水率条件下泡沫改良的优化掺入比范围。在现场试验中,使用盾构主要参数作为间接评价碴土改良效果的指标,分析了在保证土体改良剂质量的前提下,采用泡沫剂+水在稍密卵石和中密卵石为主的富水砂卵石地层中进行碴土改良的可行性。运用三维有限元数值模拟进一步验证了其室内和现场碴土改良试验结果,得出的盾构隧道碴土改良剂优化配比值以及主要掘进参数值,可为类似在建和拟建工程提供参考。Based on the shield tunneling of the Chengdu Metro line 3, the soil conditioning experiment for waterrich sandy cobble strata is conducted. In light of the laboratory experiments, a reasonable mix proportion of the moditier and the optimized mixing proportion range of the foam improvement are obtained for different moisture content conditions. In a field test, the main parameters for the shield are used as indicators to evaluate the effects on soil improvement and to analyze the feasibility of soil conditioning with a foaming agent in the water-rich sandy gravel stratum dominated by slightly dense pebbles in order to ensure the quality of the soil modifier. Through a FEM numerical simulation, the laboratory and field soil conditioning test results are further verified, and the research results of the optimized mix proportion of the improvement agent and the principal excavation parameters of shield tunneling can be used as a reference for similar construction scenarios.

关 键 词：盾构隧道 富水砂卵石 碴土改良 泡沫 配比 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]