小直径管幕工法横导洞施工现场试验及参数优化  

Excavation Field Test and Parameters Optimization of the Transverse Pilot Tunnel with Small Diameter Tube Curtain Construction Method

作　　者：赵文[1] 孙远 柏谦 夏云朋 ZHAO Wen;SUN Yuan;BAI Qian;XIA Yun-peng(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China;The Fifth Department of China Railway No.4 Bureau Group Co.,Ltd.,Jiujiang 332000,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]中铁四局集团第五工程有限公司,江西九江332000

出　　处：《东北大学学报（自然科学版）》2023年第3期432-439,共8页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51878127).

摘　　要：对沈阳地铁市府大路站采用的小直径管幕工法进行研究,首先通过现场监测分析了车站横导洞施工对地表沉降和拱顶变形的影响,然后利用Midas GTS NX数值软件建立车站三维模型,并与监测数据对比验证了模型的准确性,最后分析了横导洞数量及施工顺序对地表沉降的影响.研究结果表明:横导洞开挖施工引起的地层损失率为0.08%,管幕结构有效地抑制了地表沉降;相比于其他开挖方案,采用先边后中的开挖顺序可有效减少地表沉降24.7%;当横导洞开挖数量为5~7时,引起的地表沉降差较小仅为8%,采用4个横导洞和3个横导洞施工时,相比于7个横导洞施工方案可分别减少地表沉降18.0%和28.3%.Shifudalu station of Shenyang Metro is constructed by small diameter tube curtain construction method.The influence of the excavation of the transverse pilot tunnels on the surface settlement and vault deformation was firstly analyzed by on-site monitoring,and then the three-dimensional model of station structure was established by Midas GTS NX.The accuracy of the model was verified by comparing with on-site monitoring data,and the influence of the number of transverse pilot tumels and the construction sequence on the surface settlement was finally analyzed.The results show that the stratum loss rate caused by the excavation of the transverse pilot tunnel is 0.08%,and the pipe curtain structure can effectively restrain the surface settlement.Compared with other excavation schemes,it’s better to excavate from side tunnel to central tunnel,which can effectively reduce the surface settlement by 24.7%.The difference in surface settlement is only 8%when the number of excavated transverse pilot tunnels is five to seven.Compared with the construction scheme of seven transverse pilot tunnels,the construction of four and three transverse pilot tunnels can reduce surface settlement by 18.0%and 28.3%,respectively.

关 键 词：小直径管幕工法 数值模拟 横导洞 地表沉降 参数优化 

分 类 号：TU94[建筑科学—建筑技术科学]