武汉地区盾构穿过粉细砂层时地表沉降规律分析及施工参数优化  

Ground Surface Subsidence Law and Optimization Design of Construction Parameters for the Shield Passing through the Fine Sand Layer in Wuhan

作　　者：周春梅 王勇 程月 Zhou Chunmei;Wang Yong;Cheng Yue(School of Civil Engineering Architecture,Wuhan Institute of Technology,Wuhan 430073,China)

机构地区：[1]武汉工程大学土木工程与建筑学院,武汉430073

出　　处：《地质科技情报》2018年第5期222-228,共7页Geological Science and Technology Information

基　　金：国家自然科学基金青年基金项目(41002112);湖北省教育厅科学技术研究项目(Q20151511);武汉工程大学青年科学研究基金项目(2014);武汉工程大学重点教学建设工程项目

摘　　要：为研究盾构开挖粉细砂层对地表沉降的影响问题,基于武汉市地铁7号线香港站-三阳路站区间盾构施工监测数据,分析了开挖粉细砂层时地表沉降的一般规律,得出沉降曲线基本符合Peck沉降槽,地表沉降最大位置为盾构开挖面距监测点10环以内和盾构开挖面正前方。通过三维数值模拟,研究了优化注浆压力和掌子面平衡压力对减小地表沉降的影响,结果表明,优化掌子面平衡压力对地表沉降的影响大于优化注浆压力,两者合理优化对减小地表沉降效果最佳,盾构穿过粉细砂层时的最佳注浆压力为140 kN/m^2,掌子面平衡压力为30 kN/m^2。In order to study the influence of shield excavated fine sand layer on surface subsidence,the law of surface subsidence in excavating fine sand layer was analysed based on shield construction monitoring from Hongkong Road Station to Sanyang Road Station of Metro Line 7 in Wuhan City.The optimized design of construction parameters were studied by 3D numerical simulation.The results show that the maximum location of the surface subsidence was at the shield tail within 10 rings from the monitoring point and in the front excavation face.The effect of optimizing balance force acting at the tunnel face is greater than optimizing the grouting pressure.If both of them are reasonably optimized,that would be useful for the controlling of the surface subsidence.The best grouting pressure 140 kN/m^2 and the balance force acting at the tunnel face is 30 kN/m^2 when shield passing through the fine sand layer.

关 键 词：盾构 地表沉降 掌子面平衡压力 注浆压力 粉细砂层 

分 类 号：P642.26[天文地球—工程地质学]