Analytical prediction for tunneling-induced ground movements in clays
Analytical prediction for tunneling-induced ground movements in clays
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DOI：
10.1061/(asce)1090-0241(1998)124:9(846
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发表时间：
1998-09-01
影响因子：
3.9
通讯作者：
Poulos, HG
中科院分区：
文献类型：
--
作者：
Loganathan, N;Poulos, HG
目前的设计实践，以预测隧道引起的地面移动一般是基于经验的方法，受到一些重要的限制。为了准确预测隧道开挖引起的地表变形，预测方法应考虑许多参数的影响，如隧道施工方法和隧道掘进细节、隧道深度和直径、初始应力状态以及隧道周围土壤的应力-应变特性。本文将传统的地层损失参数定义重新定义为相对于间隙“g”参数的“等效地层损失参数”，并将其应用于预测粘土隧道周围地层移动的解析解中。这些建议的分析解决方案的适用性，然后检查与五个案例记录，其中包括一系列的地面条件，从非常坚硬的软粘土。新方法的基础上预测的等效地面损失参数与经验报告的地面损失参数，特别是在硬粘土隧道吻合得很好。所提出的新方法往往高估了软土隧道的地面损失参数，预测的地表沉降槽略宽于现场观测。然而，一般而言，对于均匀粘土中的隧道，观测和预测的沉降和水平移动是一致的。
Current design practice to predict tunneling-induced ground movements is generally based on empirical methods that are subjected to some important limitations. For a ground deformation prediction due to tunneling to be accurate, the prediction methods should account for the effect of a number of parameters, such as tunnel construction method and tunnel-driving details, tunnel depth and diameter, initial stress state, and stress-strain behavior of the soil around tunnel. In this paper, the traditional definition of the ground loss parameter is redefined as "equivalent ground loss epsilon parameter" with respect to gap "g'' parameters and incorporated on to analytical solutions to predict the ground movements around the tunnel in clays. The applicability of these proposed analytical solutions is then checked with five case records, which encompass a range of ground conditions from very stiff to soft clays. Equivalent ground loss parameters predicted on the basis of the new approach are in good agreement with reported empirical ground loss parameters, especially for tunnels in stiff clay. The proposed new approach tends to overpredict the ground loss parameter for tunnels in soft clay, and the predicted surface settlement troughs are slightly wider than the field observations. Nevertheless, in general, the observed and predicted settlement and horizontal movements are in good agreement for tunnels in uniform clay.