基于不完全土拱效应盾构隧道土压力计算方法  

Calculation Method of Earth Pressure in Shield Tunnels Based on Incomplete Soil Arching Effect

作　　者：王道远 马涛[2] 张高翔 贺少辉[1] 惠云杰[4] 马济文 宋宝禄 袁金秀[7] WANG Daoyuan;MA Tao;ZHANG Gaoxiang;HE Shaohui;HUI Yunjie;MA Jiwen;SONG Baolu;YUAN Jinxiu(Beijing Jiaotong University,Beijing 100044,China;China Railway Siyuan Survey and Design Group Co.Ltd,Wuhan,Hubei 430061,China;Hebei Provincial Seasonal Frozen Area Highway Service Safety and Early Warning Technology Innovation Center,Shijiazhuang,Hebei 050035,China;China Railway 18th Bureau Group Fifth Engineering Co.Ltd,Tianjin 300459,China;Ningxia Intercity Railway Co.Ltd,Yinchuan,Ningxia 750200,China;China Railway 16th Bureau Group Co.Ltd,Beijing 100018,China;Hebei Jiaotong Vocational and Technical College,Shijiazhuang,Hebei 050091,China)

机构地区：[1]北京交通大学,北京100044 [2]中铁第四勘察设计院集团有限公司,武汉430061 [3]河北省季冻区公路服役安全与预警技术创新中心,石家庄050035 [4]中铁十八局集团第五工程有限公司,天津300459 [5]宁夏城际铁路有限责任公司,银川750200 [6]中铁十六局集团有限公司,北京100018 [7]河北交通职业技术学院,石家庄050091

出　　处：《铁道工程学报》2025年第2期57-62,共6页Journal of Railway Engineering Society

基　　金：国家自然科学基金项目(52178378);河北省自然科学基金项目(E2021419001);河北省高等学校科学技术研究项目(ZD2022086)。

摘　　要：研究目的:盾构隧道在黏土地层和砂土地层掘进时开挖面及隧顶具有完全不同的破坏模式,基于非垂直滑裂面假定,考虑不完全土拱效应、主应力偏转等因素,推导了黏土地层圆形盾构隧道垂直土压力和竖向支护土压力计算公式。通过算例验证了计算方法的合理性,并对参数进行了敏感性分析。研究结论:(1)当埋深较小时,隧顶垂直土压力曲线呈现线性变化特征;(2)当埋深较大时,土拱效应导致土压力曲线呈现非线性变化特征,即先增大后减小的分布规律;(3)隧顶垂直土压力随内摩擦角的增大而增大,随主应力偏转角度、滑裂面角度、黏聚力的增大而减小;(4)各参数敏感性关系为:黏聚力>主应力偏转角度>滑裂面角度>内摩擦角;(5)本研究成果可为完善盾构隧道设计计算理论体系提供借鉴和参考。Research purposes:The excavation face and tunnel top of shield tunnels have completely different failure modes during excavation in clay and sand layers.Based on the assumption of a non-vertical sliding surface,taking into account factors such as incomplete soil arching effect and principal stress deflection,this paper proposes calculation formulas for vertical soil pressure and vertical support soil pressure of circular shield tunnels in clay layers.The rationality of the theoretical model is verified through numerical examples,and sensitivity analysis is conducted on the parameters.Research conclusions:(1)When the burial depth is shallow,the soil pressure curve approaches linear variation.(2)When the burial depth is deep,the soil arching effect causes the curve to exhibit nonlinear changes,and the soil pressure first increases and then decreases.(3)The vertical soil pressure at the top of the tunnel increases with the increase of internal friction angle,and decreases with the increase of principal stress deflection angle,sliding surface angle,and cohesive force.(4)The sensitivity relationship of each parameter is:cohesion>principal stress deflection angle>soil sliding surface angle>internal friction angle.(5)This research achievement can provide reference and guidance for improving the theoretical system of shield tunnel design and calculation.

关 键 词：盾构 松动土压力 不完全土拱效应 主应力偏转 计算方法 

分 类 号：U45[建筑科学—桥梁与隧道工程]