不同侧压力系数下软岩巷道围岩裂缝分布特征及控制技术研究

IF 3.5 3区 工程技术 Q3 ENERGY & FUELS Energy Science & Engineering Pub Date : 2024-07-25 DOI:10.1002/ese3.1841
Yujie Ma, Weijun Wang, Lei Fan, Chao Yuan, Xinyu Tian, Shihai Shu
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引用次数: 0

摘要

为解决深层软岩巷道围岩大变形控制问题,采用数值模拟、理论分析和现场实测等方法,研究了不同侧压力系数下软岩巷道围岩裂缝的分布特征和变形机理。结果表明,在不同侧压力系数下,围岩裂缝范围呈现出圆形、椭圆形和蝶形三种形态。无论巷道处于何种侧压力系数下,围岩裂缝始终出现在塑性区,且围岩裂缝范围与塑性区之间存在较高的相关性。塑性区围岩的应力特征主要包括两个方面。一是围岩的主应力方向发生偏移,表现为最大主应力方向在巷道周围呈环状分布。巷道上部的最小主应力方向指向巷道中心,而巷道下部的最小主应力方向偏离巷道中心。其次,围岩中最大主应力与最小主应力的比值较大。在这种应力特性下,塑性区围岩具有强烈的剪切扩张。剪切扩张使围岩裂隙张开,围岩被挤入巷道空间,进而使巷道产生较大变形。由于蝶形塑性区裂隙范围大,蝶形塑性区产生的剪切扩张变形远大于圆形/椭圆形塑性区。根据不同侧压力系数下巷道围岩的裂缝范围,提出了相应的支护方案。现场试验表明,该支护方案能有效控制围岩变形,满足巷道使用要求。
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Research on crack distribution characteristics and control technology of surrounding rock in soft rock roadway under different lateral pressure coefficients

To solve the problem of controlling large deformation of surrounding rock in deep soft rock roadway, the distribution characteristics and deformation mechanism of surrounding rock cracks in soft rock roadway under different lateral pressure coefficients are studied using numerical simulation, theoretical analysis, and field measurement. The results show that under different lateral pressure coefficients, the range of surrounding rock cracks shows three forms: round, oval, and butterfly. No matter what lateral pressure coefficient the roadway is in, the surrounding rock cracks always appear in the plastic zone, and there is a high correlation between the surrounding rock crack range and the plastic zone. The stress characteristics of the surrounding rock in the plastic zone include two main aspects. One is that the direction of the principal stress of the surrounding rock is deflected, which is manifested as an annular distribution of the direction of the maximum principal stress around the roadway. The direction of the minimum principal stress in the upper part of the roadway points to the center of the roadway, and the direction of the minimum principal stress in the lower part of the roadway deviates from the center of the roadway. Second, the ratio of the maximum to minimum principal stress in the surrounding rock is large. Under this stress characteristic, the surrounding rock in the plastic zone has strong shear dilation. The shear dilation makes the crack of the surrounding rock open so that the surrounding rock is squeezed into the roadway space, and then the roadway produces large deformation. Due to the large range of cracks in the butterfly-shaped plastic zone, the shear dilation deformation produced by the butterfly-shaped plastic zone is far more than that of the round/oval plastic zone. According to the crack range of roadway surrounding rock under different lateral pressure coefficients, the corresponding support scheme is put forward. Field experiments show that the support scheme can effectively control the deformation of surrounding rock and meet the requirements of roadway use.

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来源期刊
Energy Science & Engineering
Energy Science & Engineering Engineering-Safety, Risk, Reliability and Quality
CiteScore
6.80
自引率
7.90%
发文量
298
审稿时长
11 weeks
期刊介绍: Energy Science & Engineering is a peer reviewed, open access journal dedicated to fundamental and applied research on energy and supply and use. Published as a co-operative venture of Wiley and SCI (Society of Chemical Industry), the journal offers authors a fast route to publication and the ability to share their research with the widest possible audience of scientists, professionals and other interested people across the globe. Securing an affordable and low carbon energy supply is a critical challenge of the 21st century and the solutions will require collaboration between scientists and engineers worldwide. This new journal aims to facilitate collaboration and spark innovation in energy research and development. Due to the importance of this topic to society and economic development the journal will give priority to quality research papers that are accessible to a broad readership and discuss sustainable, state-of-the art approaches to shaping the future of energy. This multidisciplinary journal will appeal to all researchers and professionals working in any area of energy in academia, industry or government, including scientists, engineers, consultants, policy-makers, government officials, economists and corporate organisations.
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