考虑成层土变异性的等效基床系数分析

发布时间：2018-03-27 07:48

本文选题：隧道工程　切入点：等效基床系数　出处：《岩石力学与工程学报》2014年S1期

【摘要】：基床系数是利用荷载结构法求解工程问题的关键。为研究具有变异性成层土地基的等效基床系数的分布特征及统计参数,基于最终沉降量一致原理推导以压缩模量为参数的等效基床系数计算方法,利用Monte Carlo方法考虑地层的变异性。在此基础上,借助Matlab软件实现求解,并将计算结果应用于港珠澳沉管隧道工程中,建立基于荷载结构法的二维分析模型。主要得到如下结论:(1)典型断面K9+843处的等效基床系数近似符合正态分布,均值为985 kPa/m,变异系数为0.265;(2)考虑地基变异性得到的沉降量近似符合对数正态分布,且差异显著;(3)断面沉降量与地层结构法三维有限元模型计算结果接近,证明上述计算方法是合理的。
[Abstract]:In order to study the distribution characteristics and statistical parameters of equivalent bed coefficients in layered soils with variability, the coefficient of foundation is the key to solve the engineering problems by using the load-structure method. Based on the consistent principle of final settlement, the equivalent bed coefficient calculation method with compression modulus as the parameter is derived, and the variation of stratum is considered by Monte Carlo method. On this basis, the solution is realized by means of Matlab software. The calculation results are applied to the engineering of Hong Kong-Zhuhai-Macao immersed tube tunnel, and a two-dimensional analysis model based on the load-bearing structure method is established. The main conclusions are as follows: 1) the equivalent bed coefficient at K9843 of typical cross section approximately accords with normal distribution. The mean value is 985 KPA / m, and the coefficient of variation is 0.265 / 2) the settlement obtained by taking into account the variation of the ground is approximately in accordance with the logarithmic normal distribution, and the difference is significant (3)) the settlement of the section is close to that of the 3-D finite element model of the stratigraphic structure method. It is proved that the above calculation method is reasonable.
【作者单位】：同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;河海大学水利水电学院;中交公路规划设计院有限公司;港珠澳大桥管理局;
【基金】：上海市科委课题(12231201000) 港珠澳大桥岛隧工程沉管隧道接头张开位移量控制技术研究(20122451)
【分类号】：U455.46;U452.11

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