大直径泥水盾构地层损失参数GAP的修正与应用研究  

On the Modification of the Ground Loss Parameter GAP for Large-Diameter Slurry Shield Tunnelling and its Application

作　　者：江强[1,2] 程海峰[3] 陈君平 

机构地区：[1]河海大学土木与交通学院,南京210098 [2]江阴市人民政府重点工程建设办公室,江阴214400 [3]北方工业大学建筑工程学院,北京100144

出　　处：《现代隧道技术》2013年第5期92-97,共6页Modern Tunnelling Technology

基　　金：无锡市2011年度建设系统科技项目(锡建总[2011]302号)

摘　　要：文章基于大直径泥水盾构施工特点及横向沉降槽理论未考虑切口压力欠压率及注浆压力超压率造成的地层损失,提出了GAP参数的修正公式;依托江苏江阴澄江西路过江隧道工程,研究分析了大直径泥水盾构施工对软土地层的扰动影响,将其运用于修正的Peck公式及基于Sagseta理论的解析解,并通过现场实测数据进行了验证。结果表明:由于考虑到施工质量、切口压力欠压率及注浆压力超压率等因素造成的等效地层损失,因此得到的计算沉降值更大,与实测数据更为符合,且在理论上更为合理。The fact of large-diameter slurry shield construction related to problems of high ground losses （causedby low cutting face pressures and high grouting pressures） is not sufficiently considered in transverse settlement trough theory. Therefore, a modified formula for the GAP parameter is proposed. Using the construction of the Chengjiang west road river-crossing tunnel in Jiangyin City as an example, a modified GAP parameter was incor- porated into the modified Peck formula and the analytical solution based on the Sagseta theory in order to study the influence of large-diameter slurry shield construction on soft soil. It was verified that due to the equivalent ground losses caused by factors such as construction quality, under-pressure of the cutting face, and and high grouting pressures, calculated settlements are larger, but are more consistent with the measured data and more reasonable theoretically.

关 键 词：泥水盾构土体变形地层损失 GAP参数修正公式 

分 类 号：U455.43[建筑科学—桥梁与隧道工程] U456.3[交通运输工程—道路与铁道工程]