双线平行盾构开挖引起的地表沉降随机介质预测  

Stochastic Medium Prediction for Ground Settlement Induced by Double-Line Parallel Shield Tunnelling

作　　者：魏纲[1] 周杨侃 

机构地区：[1]浙江大学城市学院土木工程系,杭州310015

出　　处：《现代隧道技术》2016年第5期92-99,107,共9页Modern Tunnelling Technology

基　　金：浙江省科技厅公益技术研究项目(2016C33051);住房和城乡建设部2015年科学技术项目计划(2015-K5-026)

摘　　要：针对双线水平平行盾构隧道施工引起的地表沉降计算方法,文章建立修正的随机介质理论简化方法,分别计算先行盾构和后行盾构施工引起的地表沉降,并考虑两者参数取值不同以及后行盾构最大沉降量位置的偏移,最终叠加得到双线水平平行盾构施工引起的总的地表沉降。研究结果表明:文章提出的方法能够计算地表沉降和水平位移,计算值与实测地表沉降值比较吻合,且适用范围较广;由于先行盾构施工的影响,导致后行盾构施工时周围土体受到扰动,后行盾构的半径收敛值要大于先行盾构,但主要影响角则会变小,且后行盾构引起的最大地表沉降位置会向中轴线方向产生偏移。According to the calculation method of ground settlement induced by double-line parallel shield tunnel- ling （DLPST）, a simplified method of stochastic medium theory is modified in this paper that： calculates the ground settlements induced by both prior and later shield tunnelling, respectively; considers different parameter values and the shifting of maximum ground settlement induced by later shield tunnelling; and eventually obtains the total ground settlement induced by double-line parallel shield tunnelling. Research findings show that the proposed method can be used to calculate the ground settlement and horizontal displacement; its calculated values mostly co- incide with the measured values of ground settlement, and it therefore has a wide application. Because of the im- pacts of prior shield tunnelling, the surrounding soil mass is disturbed during later shield tunnelling and the radius convergence of the second shield tunnelling is larger than that of the prior shield, while the main influential angle becomes smaller and the maximum ground settlement is shifted to the direction of the central axis.

关 键 词：双线平行盾构隧道 随机介质理论 地表沉降 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]