楔形体模型的简化计算方法  

A Simplified Calculation Method for the Wedge Model

作　　者：赵红泽[1] 郑群飞[1] 朱建明[2] 高晓将 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083 [2]华北科技学院安全工程学院,北京101601 [3]北京志能祥赢节能环保科技股份有限公司,北京100160

出　　处：《现代隧道技术》2017年第1期83-88,共6页Modern Tunnelling Technology

摘　　要：目前用于求解盾构开挖面极限支护力的理论计算公式参数都较多且计算较为繁琐。文章基于目前使用较为普遍的楔形体理论计算模型对极限支护力的简化计算方法进行了研究。研究发现:当砂土的内摩擦角在20°~70°范围内时,其计算值的对数Inσ_T与砂土的内摩擦角ψ近似呈线性关系;而且在不考虑地面附加应力的影响下,当砂土的重度、盾构开挖面直径和盾构埋深不同时,lnσ_T与ψ的关系曲线近似平行。文章通过线性拟合的方法,在一定范围内通过引入砂土重度影响系数a、盾构开挖面直径影响系数6和埋深影响系数c得到了考虑砂土重度、盾构开挖面直径和埋深等因素影响的盾构开挖面极限支护力的简化计算公式,简化了盾构开挖面极限支护力的求解过程。There are so many parameters in theorectical calculation formulas for the limit support force of a shield excavation face, and the calculations are very complex. Based on the popular wedge calculation model, a simplified calculation for the limit support force was studied. The results show that the relationship between the logarithm lnσT of the calculated value and the internal friction angle φ of sandy soil is approximately linear when the internal fric- tion angle is in the range of 20°～70°; and without considering the influence of additional stress on ground, the rela- tion curve of lnσT and φ is approximately parallel under the different factors of sandy soil gravity, the diameter of the shield excavation face and the buried depth. A simplified calculation method for the limit support force of a shield excavation face was obtained by way of linear fitting and introducing the influence coefficients of the sandy soil grav- ity a, the diameter of the shield tunnel excavation face b and the buried depth c, which simplifies the solving process of the limit support force of a shield excavation face.

关 键 词：楔形体模型 盾构开挖面 极限支护力 线性拟合 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]