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首页> 外文会议>Proceedings of 2009 international symposium on risk control and managment of design, construction and operation in underground engineering >Discrete Element Analysis on Shallow-buried Jointed Ground Characteristic Curves around Tunnel
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Discrete Element Analysis on Shallow-buried Jointed Ground Characteristic Curves around Tunnel

机译：隧道浅埋节理地面特征曲线的离散元分析

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摘要

Characteristic Curve Method, based on New Austrian Tunneling Method and also called Convergenceconfinement Method, is an approach which explains the interaction of the surrounding rock and supporting system of underground engineering. The key to this method is the accurate knowledge of ground characteristic curves around tunnel. This calls for the accurate numerical simulation of the relation between the reaction force acts on the tunnel support and the surrounding rock radial displacement. Many other research methods can not directly achieve this due to the complexity of rock joints. This paper studied the properties of two densely-distributed shallow-buried jointed ground areas and their ground characteristic curves by applying discrete element method (DEM). The discrete element numerical simulation models of the shallow-buried cracked surrounding rocks were set up; the relation between the reaction force acts on the tunnel support and the surrounding rock radial displacement of the U-shape double lane tunnel were studied by the calculation on the tunnel linings of varying stiffness. The paper indicates that the existence of joints leads to the ground characteristic curves at different spots in the crown and bottom showing varied properties and certain discreteness. It offers significant reference for the designing of the tunnel lining in real projects.
机译：基于新奥地利隧道法又称为收敛约束法的特征曲线法是一种解释围岩与地下工程支护系统相互作用的方法。该方法的关键是准确了解隧道周围的地面特性曲线。这要求对作用在隧道支座上的反作用力与围岩径向位移之间的关系进行精确的数值模拟。由于岩石节的复杂性，许多其他研究方法无法直接实现这一目标。本文应用离散元方法研究了两个密集分布的浅埋节理地面的特性及其地面特征曲线。建立了浅埋裂隙围岩的离散元数值模拟模型。通过计算不同刚度的隧道衬砌，研究了反作用力作用于隧道支座与U型双线隧道围岩径向位移之间的关系。文章指出，节理的存在导致冠和底部不同部位的地面特性曲线表现出不同的特性和一定的离散性。它为实际工程中隧道衬砌的设计提供了重要参考。

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