| 孟建宇.基于随机场理论的盾构隧道地表沉降槽曲线研究[J].地质与勘探,2020,56(3):597-604 |
| 基于随机场理论的盾构隧道地表沉降槽曲线研究 |
| Study on surface settlement trough curves of shield tunnels based on random field theory |
| 投稿时间：2019-06-11 修订日期：2019-11-19 |
| DOI：10.12134/j.dzykt.2020.03.012 |
| 中文关键词: 盾构隧道 随机场理论 空间变异性 沉降槽 Peck公式 |
| 英文关键词: shield tunnel,random field theory,spatial variability,settlement trough,Peck formula |
| 基金项目:新疆维吾尔自治区高校科研计划（编号：XJEDU2018Y008）资助 |
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| 中文摘要: |
| 在对地表变形产生的沉降槽的研究中，通常将土性参数看作确定值，并且假定沉降槽是关于隧道轴线对称的，这样往往忽略土体的非均质性特点，对沉降槽的假定也偏于理想化。为此，借助随机场的计算机模拟方法，在引入曲线偏移量对经典Peck公式改进基础上，开展Monte-Carlo随机分析，分析土体弹性模量空间变异性对沉降槽曲线的影响。研究结果表明：（1）引入曲线偏移量是可行的，并且可以表现沉降槽在隧道轴线位置的不对称性；（2）土体弹性模量空间变异性对沉降槽的形态影响不明显，但对沉降槽宽度、最大沉降值和最大沉降位置有重要影响。 |
| 英文摘要: |
| In the study of the settlement trough caused by surface deformation, soil parameters are usually considered as definite values, and the settlement groove is assumed to be symmetrical about the axis of the tunnel. Thus the heterogeneity of the soil is neglected, and the assumption of the settlement trough is biased towards idealization. To further address this issue, a Monte-Carlo stochastic analysis is carried out to analyze the influence of spatial variability of soil’s elastic modulus on the settlement trough curve by means of computer simulation of the random field on the basis of introducing curve offset to improve the classical Peck formula. The results show that (1) the introduction of curve offset is feasible, which can show the asymmetry of the settlement trough on the tunnel axis. (2) The spatial variability of soil’s elastic modulus has no obvious influence on the shape of the settlement trough, but can pose notable effects on the width of the settlement trough, maximum sinking amplitude and the location of the maximum subsidence. |
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