Asymmetric support technology for gob side entry retaining with high water material

IF 0.9 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Acta Geodynamica et Geomaterialia Pub Date : 2021-06-18 DOI:10.13168/agg.2021.0023

Q. Shan

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引用次数: 2

Abstract

The gob side entry retaining with high water material is often used in coal mines. To study the stress evolution characteristics of surrounding rock and asymmetric support control technology of gob side entry retaining with high water material, the evolution law of stress and deformation of surrounding rock in gob side entry retaining during working face mining is studied by theoretical analysis, numerical simulation and field measurement. According to the stress variation of overlying strata during the mining process of the working face, the mechanical models before and after the basic roof fracture were established respectively. The stress and deformation of the filling body and the roof on the side of the filling body are larger, and the stress and deformation of the solid coal and the roof on the side of solid coal are smaller. The maximum stress is at 3 m away from the roadway. The first weighting step distance is 40 m and the periodic weighting step distance is 30 m. Based on the stress and deformation characteristics of the roadway surrounding, the roadway surrounding support is divided into filling bodyside, solid coal side, and middle part of roadway roof. The asymmetric support technology of "filling body+ double row hydraulic prop+ I-beam+ high-strength pretension anchor cable+ high-strength bolt" is proposed. The field engineering practice shows that the surrounding rock control effect of asymmetric support technology with high water material is good. ARTICLE INFO

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高含水材料沿空留巷非对称支护技术

高含水材料沿空留巷支护是煤矿常用的一种支护方式。为研究高含水材料沿空留巷围岩应力演化特征及非对称支护控制技术，采用理论分析、数值模拟和现场实测相结合的方法，研究了工作面开采沿空留巷道围岩应力和变形的演化规律。根据工作面开采过程中上覆岩层的应力变化，分别建立了基本顶板破裂前后的力学模型。充填体和充填体侧顶板的应力和变形较大，固体煤和固体煤侧顶板的受力和变形较小。最大应力在距离道路3m处。首次加重步长为40m，周期加重步长为30m。根据巷道围岩的应力和变形特征，将巷道围岩支护分为充填体侧、固体煤侧和巷道顶板中部。提出了“填充体+双排液压支柱+工字钢+高强度预应力锚索+高强度螺栓”的不对称支护技术。现场工程实践表明，高含水材料非对称支护技术对围岩的控制效果良好。文章信息

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来源期刊

Acta Geodynamica et Geomaterialia 地学-地球化学与地球物理

CiteScore

2.30

自引率

0.00%

发文量

期刊介绍： Acta geodynamica et geomaterialia (AGG) has been published by the Institute of Rock Structures and Mechanics, Czech Academy of Sciences since 2004, formerly known as Acta Montana published from the beginning of sixties till 2003. Approximately 40 articles per year in four issues are published, covering observations related to central Europe and new theoretical developments and interpretations in these disciplines. It is possible to publish occasionally research articles from other regions of the world, only if they present substantial advance in methodological or theoretical development with worldwide impact. The Board of Editors is international in representation.