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首页> 外文期刊>Australian Geomechanics >Geotechnical modelling of station caverns for the Epping to Chatswood rail line project
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Geotechnical modelling of station caverns for the Epping to Chatswood rail line project

机译：Epping到车士活铁路项目的车站洞室岩土工程建模

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The Epping to Chatswood Rail Line project comprises a twin rail tunnel, three new underground stations and the upgrading of one existing station. The station caverns intersect a sequence of horizontally bedded shale and sandstone. The major rock defects consist of bedding planes, bedding plane seams, low angled cross bed partings and sub-vertical joint sets. Local experiences in the Sydney Basin have indicated that the behaviour of the defects and their interaction with the roof support system are critical to the performance of underground excavations. Another key geological feature that can have significant performance impact is the relatively high locked-in in situ lateral stresses. Each of the new stations comprises a large span platform cavern, an adjoining concourse cavern, associated escalator shafts and service buildings. The design roof support system is cable bolts with cement grouted end anchorage. The interaction between the bolts and the jointed rock mass within the influences of the various facilities is complex and thus rigorous modelling was employed. This modelling included 3D distinct element and boundary element analyses and 2D finite element approach. The complexity of the numerical models varied from homogeneous rock to layered rock with various discontinuities. Furthermore, both end-anchored and fully grouted bolts have been incorporated. Various parametric studies were undertaken to assess the effects of various model components (rock mass, defects, in situ stresses, sequencing and roof support installations) on cavern performance. Based on the modelling results, a system of rock bolts and construction staging has been adopted to optimise the permanent support system. This paper is confined to the geotechnical modelling aspects of the project and presents the geological setting and the various analytical procedures undertaken. The results of the parametric studies and their impact on the final selection of the support systems are also outlined.
机译：Epping到Chatswood铁路线项目包括一条双铁路隧道，三个新的地下车站以及一个现有车站的升级。车站洞穴与一系列水平层状页岩和砂岩相交。主要的岩石缺陷包括层理平面，层理接缝，低角度的交叉层分离和次垂直节理组。悉尼盆地的当地经验表明，缺陷的行为及其与屋顶支撑系统的相互作用对于地下挖掘的性能至关重要。可能会对性能产生重大影响的另一个关键地质特征是相对较高的锁定原位侧向应力。每个新站均包括一个大跨度平台洞穴，一个相邻的大厅洞穴，相关的自动扶梯井和服务楼。设计的屋顶支撑系统是带有水泥灌浆末端锚固的电缆螺栓。在各种设施的影响下，锚杆与节理岩体之间的相互作用非常复杂，因此采用了严格的建模方法。该建模包括3D不同元素和边界元素分析以及2D有限元方法。数值模型的复杂性从均质岩石到具有各种不连续性的层状岩石不等。此外，还结合了端部锚固和完全灌浆的螺栓。进行了各种参数研究，以评估各种模型组件（岩体，缺陷，原地应力，排序和屋顶支撑装置）对洞室性能的影响。根据建模结果，采用了锚杆和施工阶段的系统来优化永久支撑系统。本文仅限于该项目的岩土工程建模方面，并介绍了地质环境和进行的各种分析程序。还概述了参数研究的结果及其对支持系统最终选择的影响。

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