【摘要】 研究目的：Peck公式是研究隧道地表沉降的重要方法之一，其预测结果主要受沉降槽宽度i和地层损失率η等参数影响，因各参数区域性特点较强，不同地区参数取值大有差别。所以，本文以昆明湖相沉积地层双线盾构隧道为研究对象，分别探讨各参数之间的变化规律及取值分布，最后得到适用于该地区的双线隧道地表沉降预测公式，填补国内研究空白。研究结论：（1）受右线先行影响，左线Peck公式拟合程度有所降低；（2）i与隧道埋深z呈正比关系，可用沉降槽宽度系数k进行表征，与加权压缩模量E的相关性较弱；（3）η与z呈正相关，与注浆率g呈负相关，与E基本无规律；（4）双线隧道地表沉降预测公式取先行隧道k1为[0.23,0.68],η1为[0.31%,1.66%]，取后行隧道k2为[0.21,0.58],η2为[0.31%,1.79%];(5)以某线路实测数据验证公式合理性，其预测结果与实际沉降基本吻合，均位于上、下限之间，同时根据上限曲线的最大沉降可大致判断预测沉降值是否超过工程预警，可为类似隧道安全施工提供参考。更多还原

【Abstract】 Research purposes:The Peck formula is one of the important methods for studying tunnel surface settlement. Its prediction results are mainly affected by parameters such as settlement groove width i and formation loss rate η,and due to the strong regional characteristics of each parameter,the parameter values vary greatly in different regions. Therefore,this paper takes the double line shield tunnel in the sedimentary strata of Kunming Lake as the research object,explores the variation rules and value distribution of each parameter,and finally obtains a surface settlement prediction formula for the double line tunnel applicable to the region,filling the research gap in China.Research conclusions:(1)Due to the influence of the right line leading,the fitting degree of the Peck formula on the left line has decreased.(2)i is directly proportional to the tunnel depth z and can be characterized by the settlement groove width coefficient k. Its correlation with the weighted compression modulus E is weak.(3) η is positively correlated with z,negatively correlated with grouting rate g,and has little regularity with E.(4)The double line tunnel surface settlement prediction formula takes the leading tunnel k1[0.23,0.68],η1[0.31%,1.66%],and the following tunnel k2[0.21,0.58],η2[0.31%,1.79%].(5)The rationality of the formula was verified by the measured data of a certain line,and the predicted results were basically consistent with the actual settlement,both located between the upper and lower limits. At the same time,based on the maximum settlement of the upper limit curve,it can be roughly judged whether the predicted settlement value exceeds the engineering warning,which can provide reference for safe construction of similar tunnels.更多还原