盾构法隧道地面沉降槽宽度系数取值的研究  

STUDY ON CALCULATION FOR WIDTH PARAMETER OF SURFACE SETTLEMENT TROUGH INDUCED BY SHIELD TUNNEL

作　　者：魏纲[1] 

机构地区：[1]浙江大学城市学院土木工程系,杭州310015

出　　处：《工业建筑》2009年第12期74-79,109,共7页Industrial Construction

基　　金：浙江省教育厅科研资助项目(20070180)

摘　　要：盾构法隧道施工引起的地面沉降槽宽度系数i值与隧道半径R、隧道轴线埋深h及土质条件(土的内摩擦角φ)有关。对13例22个实测数据的统计结果表明:i值与[R+htan〔45°-φ/2〕]值间呈线性关系,i/[R+htan〔45°-φ/2〕]值中共有20个数据在[0.45,0.50],只有2个数据(分别为0.43和0.51)在该范围外;i与h基本呈线性关系,但离散性较大,对于黏性土,k=i/h的范围为[0.37,0.66];i/R与h/(2R)间的关系采用指数函数拟合效果比常用的幂函数要好,但参数取值范围较大。基于分析结果,提出新的i值计算公式,该公式适用于黏性土,考虑了R、h、φ,同时参数取值范围较小,避免经验性参数取值范围较大可能带来的误差。The value of width parameter i of surface settlement trough induced by shield tunnel is related to tunnel radius R, tunnel axis depth h, and soil condition （internal friction angle φ of soil）. The analyses of 22 actual values from 13 constructional cases show that value of i is linear with [ R ＋ htan（45°-φ/2） ]. 20 values of i /[ R ＋ h tan（45°-φ/2）] are in the range of [0.45, 0.50]. Only 2 values （0.43, 0.51） are beyond but close to the bounds, generally within 10% difference. The values of i is linear with h, but their dispersion is great. The values of i/h are in the range of [0.37, 0.66] for cohesive soil. The result shows that the contribution of relationship curve of i/R values with h/（2R） values obtained from exponential function fitting is better than that obtained from power function fitting, but the scope of empirical parameter range is large. Based on the above-mentioned results, new calculation method for i is put forward. This method is applicable in cohesive soil, and R, h and φ are taken into account. The possible error induced by large scope of empirical parameters range is avoided because of small parameter range in this method.

关 键 词：盾构隧道 地面沉降 PECK公式 沉降槽宽度系数 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]