摘要
针对现有盾构施工中地层材料参数测量计算不准确、不同掘进参数对地表沉降影响难以评价的问题,依托某富水砂层盾构施工的引水隧洞,通过三维数值模拟,设计地表沉降为指标的正交试验,分析了不同材料参数的敏感性;此外,依据实测沉降,反演了材料的力学参数,并计算不同开挖仓压力、同步注浆压力和推进速度等盾构掘进参数下的地表沉降曲线。结果表明,砂层内摩擦角对地表沉降影响较大,增加砂土内摩擦角和衬砌弹性模量会减小沉降;盾构掘进速度对地表沉降影响较大,增加掘进速度会增加最大沉降量和“沉降槽”宽度,增加开挖仓压力或增加同步注浆压力会减小最大沉降量和“沉降槽”宽度。
There are some problems in construction,such as inaccurate material parameters and unclear influence of shield operation parameters on ground settlement.Based on a water-rich sand layer shield construction diversion tunnel,an orthogonal experiment is designed by setting the index of ground surface settlement,and a three-dimensional numerical simulation is used to analyze sensitivity of different material's parameter.Mechanical parameters of materials are inverted according to the observed settlement.The subsidence lines under different excavation pressures,different synchronous grouting pressures and different speeds of the shield are calculated.The result shows that the surface subsidence is most sensitive to the change of internal friction angle of sand layer.Increasing the internal friction angle of the sand layer and the elastic modulus of the lining will reduce the settlement.The speed of the shield has a great influence on the subsidence.Increasing the speed of the shield,the maximum settlement of the surface settlement curve will increase,and the width of the "settlement tank" will also increase.The maximum settlement and the width of "settlement tank" decrease with the increase of excavation chamber pressure or synchronous grouting pressure.
作者
马子昌
张继勋
任旭华
张玉贤
王长生
赵亮
朱代富
陆嘉伟
MA Zi-chang;ZHANG Ji-xun;REN Xu-hua;ZHANG Yu-xian;WANG Chang-sheng;ZHAO Liang;ZHU Dai-fu;LU Jia-wei(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Henan Province Xixiayuan Water Conservancy Project Water Conveyance and Irrigation District Engineering Construction Administration,Zhengzhou 450000,China;PowerChina Zhongnan Engineering Corporation Limited,Changsha 410014,China;Shanghai Municipal Engineering Design Institute(Group)Corporation Limited,Shanghai 200092,China)
出处
《水电能源科学》
北大核心
2023年第10期149-153,共5页
Water Resources and Power
基金
云南省重大科技专项计划项目(202102AF080001)
中央高校业务费项目(B220204001)。
关键词
富水砂层盾构
地表沉降
地层参数
掘进参数
参数敏感性分析
tunnel shield in water rich sand layer
ground surface settlement
soil parameters
tunneling operation parameters
parametersensitivityanalysis
作者简介
马子昌(1998-),男,硕士研究生,研究方向为盾构隧洞数值模拟,E-mail:1121269271@qq.com;通讯作者:张继勋(1974-),男,博士、副教授,研究方向为水工地下洞室,E-mail:zhangjixun@hhu.edu.cn。
