摘要
文章提出近距离双线水平平行盾构施工引起的总的土体沉降曲线符合正态分布规律,并对现有双线平行盾构施工引起的地面沉降计算方法进行了综述。针对现有各种方法存在的不足,建立了修正的二维Peck公式,可以计算双线平行盾构施工引起的深层土体沉降,同时能够考虑沉降曲线的不对称性。对计算参数取值进行研究,实测数据统计结果表明i总/i先跟h/D成明显的线性减小关系,提出了参数i总和η总的计算公式。首次提出两条隧道轴线的相对水平距离系数C=L/(h+R),认为总的地面沉降曲线形状与C值大小有关,本文公式适用于C<0.6的工况。算例分析结果表明:本文方法预测值与实测值比较吻合,且计算比较简便。
This paper presents that the curve of soil settlement induced by small-interval double-bore parallel shield tunnel construction conforms with the normal distribution, and summarizes the calculation method for surface settlement. Aiming at the deficiencies of various calculation methods, the modified 2D Peck formula is established to calculate the deep soil settlement while considering the asymmetry of the settlement curve. Based on the re- search of calculation parameters, the measured results show that iTotal/ iAdvancing tunnel （i： width coefficient of the set- tlement trough） decreases linearly with the increase of h/D, thus giving the formula for iTotal and ηTotal（η ： Soil loss rate）. Additionally, this paper firstly proposes the coefficient C of relative horizontal distance between two tunnel axes （C〈0.6; C=U（h＋R））, to which the shape of the total ground settlement curve is related. According to the case study, the predicted values agree with the measured ones and the calculation is relatively simple.
出处
《现代隧道技术》
EI
北大核心
2014年第2期63-69,75,共8页
Modern Tunnelling Technology
基金
国家自然科学基金资助(项目批准号:51078332)
浙江省自然科学基金资助项目(Z1100016)
关键词
双线平行盾构施工
土体沉降
计算方法
Double-bore parallel shield tunnel construction
Soil settlement
Calculation method
