基于工作面-支护-顶板系统的急倾斜煤层工作面稳定性分析

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.25.3.233
D. Kong, Y. Xiong, Zhanbo Cheng, Nan Wang, Guiyi Wu, Yong Liu
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引用次数: 33

摘要

肋剥落是影响大倾斜煤层安全生产的主要问题。急倾斜煤层破坏工作面与支护系统相互影响,形成恶性循环,诱发大面积围岩坍塌。为了分析急倾斜工作面破坏机理,提出相应的突出控制措施,建立了基于工作面-支护-顶板系统的力学模型和工作面破坏力学模型,揭示了肋层剥落的灾害机理,并对相关因素进行了敏感性分析。并以陈满庄煤矿3402工作面为工程背景,利用FLAC3D软件建立数值模型,对急倾斜煤层中位移场和应力场的传播规律进行了模拟,验证了本文的理论分析。结果表明:急倾斜工作面滑体表现为上层破坏高度小于下层破坏高度,呈不规则四边形棱锥状;而且,裂纹从滑体的上层开始,逐渐向下层发展,最终导致肋层剥落。影响工作面稳定性的因素依次为:上覆岩层压力(P)、煤体力学参数(如:黏聚力(c)、内分数角()、支护强度(F)、护块支护力(F)
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Stability analysis of coal face based on coal face-support-roof system in steeply inclined coal seam
Rib spalling is a major issue affecting the safety of steeply inclined coal seam. And the failure coal face and support system can be affected with each other to generate a vicious cycle along with inducing large-scale collapse of surrounding rock in steeply inclined coal seam. In order to analyze failure mechanism and propose the corresponding prominent control measures of steeply inclined coal working face, mechanical model based on coal face-support-roof system and mechanical model of coal face failure was established to reveal the disaster mechanism of rib spalling and the sensitive analysis of related factors was performed. Furthermore, taking 3402 working face of Chen-man-zhuang coal mine as engineering background, numerical model by using FLAC3D was built to illustrate the propagation of displacement and stress fields in steeply inclined coal seam and verify the theory analysis as mentioned in this study. The results show that the coal face slide body in steeply inclined working face can be observed as the failure height of upper layer smaller than that of lower layer exhibiting with an irregular quadrilateral pyramid shape. Moreover, the cracks were originated from the upper layer of sliding body and gradually developed to the lower layer causing the final rib spalling. The influence factors on the stability of coal face can be ranked as overlying strata pressure (P) > mechanical parameters of coal body (e.g., cohesion (c), internal fraction angle (𝛟)) > support strength (F) > the support force of protecting piece (F
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
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
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