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Discontinuous deformation analysis of super section tunnel surrounding rock stability based on joint distribution simulation

机译：基于联合分布模拟的超断面隧道围岩稳定性非连续变形分析

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Based on binocular stereo photography measurement technology, the actual distribution information of joints and fractures in the tunnel face were obtained via image processing and feature extraction, and the preliminary evaluation of surrounding rock stability of Laohushan tunnel was conducted according to surrounding rock classification method. Since all available surrounding rock classification approaches didn't consider the influences of the size effect of tunnel excavation span and unfavorable geologic bodies such as weak-fracture zones, an improved discontinuous deformation analysis (DDARF) method was adopted to conduct a numerical simulation of the deformation and fracture processes of the surrounding rock. Using the traveling wave method, triangle DDA blocks were automatically generated in the calculation zone, and the block boundaries were divided into real joints and virtual joints. Based on the real joint information obtained via aforementioned photographic measurement, the real joints in the tunnel face were dynamically modified, in order to achieve the simulation of joint distribution. The results revealed that the fracture evolution regularity, deformation failure mechanism, and block dropping phenomenon that the DDARF joint simulation model calculated are in good agreement with actual conditions, while those obtained based on conventional models present differences from field situation. Additionally, focusing on the localised rockfall phenomenon of Laohushan tunnel, the crack extension rate was introduced to conduct a quantitative comparison of the rock crack evolution process with or without anchor supporting. The research results offer practical guidance for field construction and anchorage support scheme optimization. (C) 2017 Elsevier Ltd. All rights reserved.
机译：基于双目立体照相测量技术，通过图像处理和特征提取，获得了巷道缝隙和裂缝的实际分布信息，并根据围岩分类方法对老虎山隧道的围岩稳定性进行了初步评价。由于所有可用的围岩分类方法都没有考虑隧道开挖跨度和不利地质体（如弱裂缝带）的尺寸效应的影响，因此采用改进的非连续变形分析（DDARF）方法对隧道进行数值模拟。围岩的变形和破裂过程。使用行波法，在计算区域中自动生成三角形DDA块，并将块边界划分为真实关节和虚拟关节。基于通过上述摄影测量获得的真实节理信息，对隧道工作面中的真实节理进行了动态修改，以实现节理分布的模拟。结果表明，DDARF联合仿真模型计算出的裂缝演化规律，变形破坏机理和块体掉落现象与实际情况吻合较好，而基于常规模型得到的模拟结果与现场情况存在差异。另外，针对老虎山隧道局部落石现象，引入裂缝扩展率，对有无锚固支护的岩石裂缝演化过程进行定量比较。研究结果为现场施工和锚固支护方案的优化提供了实用指导。 （C）2017 Elsevier Ltd.保留所有权利。

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