Dynamic stability analysis of rock tunnels subjected to impact loading with varying UCS

IF 2.5 3区工程技术 Q2 ENGINEERING, CIVIL

Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.24.6.505

Mohammad Zaid

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引用次数: 21

Abstract

The present paper has been carried out to understand the effects of impact loading on the rock tunnels, constructed in different region corresponding to varying unconfined compressive strength (UCS), through finite element method. The UCS of rockmass has substantial role in the stability of rock tunnels under impact loading condition due to falling rocks or other objects. In the present study, Dolomite, Shale, Sandstone, Granite, Basalt, and Quartzite rocks have been taken into consideration for understanding of the effect of UCS that vary from 2.85 MPa to 207.03 MPa. The Mohr-Coulomb constitutive model has been considered in the present study for the nonlinear elastoplastic analysis for all the rocks surrounding the tunnel opening. The geometry and boundary conditions of the model remains constant throughout the analysis and missile has 100 kg of weight. The general hard contact has been assigned to incorporate the interaction between different parts of the model. The present study focuses on studying the deformations in the rock tunnel caused by impacting load due to missile for tunnels having different concrete grade, and steel grade. The broader range of rock strength depicts the strong relationship between the UCS of rock and the extent of damage produced under different impact loading conditions. The energy released during an impact loading simulation shows the variation of safety and serviceability of the rock tunnel.

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冲击荷载作用下岩石隧道动力稳定性分析

本文采用有限元方法，研究了冲击荷载对不同区域不同无侧限抗压强度(UCS)下围岩隧道的影响。在落石或其他物体的冲击荷载作用下，岩体的单轴稳定性对岩石隧道的稳定性有着重要的影响。在本研究中，考虑了白云岩、页岩、砂岩、花岗岩、玄武岩和石英岩岩石，以了解在2.85 MPa至207.03 MPa范围内的UCS影响。本文采用Mohr-Coulomb本构模型对隧道开口周围所有围岩进行了非线性弹塑性分析。模型的几何和边界条件在整个分析过程中保持不变，导弹的重量为100公斤。一般的硬接触已被分配，以纳入模型不同部分之间的相互作用。本文主要研究了不同混凝土等级和钢等级隧道在导弹冲击荷载作用下的岩石隧道变形。岩石强度范围的扩大说明岩石的单抗强度与在不同冲击载荷条件下产生的损伤程度之间有很强的关系。冲击荷载模拟过程中释放的能量反映了岩石隧道安全性和使用性能的变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL

CiteScore

5.20

自引率

25.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions