Study on fracture characteristics of surrounding rock of twin tunnels under various crack inclination and location conditions

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering Pub Date : 2024-08-19 DOI:10.1016/j.ijimpeng.2024.105084

Ze Deng , Zheming Zhu , Lei Zhou , Yao Zhang , Hongdan Zhang , Fukuan Nie , Bang Liu

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Abstract

In some practical projects, two neighboring tunnels are often constructed in natural rock bodies that have a significant number of fractures with unpredictable inclination angles and locations. To study dynamic fracture characteristics of the surrounding rock mass of the twin tunnels containing a crack with different crack inclinations and crack locations, an experimental model of a cracked twin tunnel was designed and proposed, dynamic experimental analyses were carried out by using a traditional split Hopkinson pressure bar (SHPB) device and digital image correlation (DIC) method, followed by simulation conducted by using LS-DYNA code. The findings indicate that the spandrels and corners of the twin tunnels nearest the pre-cracks are more vulnerable to failure under dynamic loads, resulting in tunnels joining the ends of the pre-cracks. With various crack inclinations and crack locations, the initial cracks are typically produced at the roof and floor of the tunnel, as well as at the points of the pre-cracks. The specimen's kind of crack and its emergence site are connected. Crack inclination and location have little influence on the maximum displacement value in the twin tunnels. The study's findings could offer a fresh theoretical direction for evaluating the stability of twin tunnels when there are numerous joints and flaws.

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不同裂缝倾角和位置条件下双线隧道围岩的断裂特性研究

在一些实际工程中，往往会在天然岩体中建造两条相邻的隧道，而天然岩体中存在大量裂缝，且裂缝的倾角和位置难以预测。为了研究含有不同裂缝倾角和裂缝位置的裂缝双隧道围岩体的动态断裂特征，设计并提出了裂缝双隧道的实验模型，利用传统的分体式霍普金森压力棒（SHPB）装置和数字图像相关（DIC）方法进行了动态实验分析，然后利用 LS-DYNA 代码进行了模拟。研究结果表明，在动荷载作用下，最靠近预裂缝的双隧道拱顶和拐角处更容易发生破坏，导致隧道与预裂缝两端相连。在不同的裂缝倾斜度和裂缝位置下，隧道顶部和底部以及预裂缝点通常会产生初始裂缝。试样的裂缝类型与裂缝出现的位置有关。裂缝的倾斜度和位置对双隧道的最大位移值影响不大。研究结果可为评估存在大量接缝和缺陷的双隧道的稳定性提供新的理论方向。

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

International Journal of Impact Engineering 工程技术-工程：机械

CiteScore

8.70

自引率

13.70%

发文量

241

审稿时长

52 days

期刊介绍： The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications