陈怀玉, 张文, 成武. 2019: 基于FLAC3D的煤矿采空区变形数值模拟分析. 工程地质学报, 27(s1): 327-333. DOI: 10.13544/j.cnki.jeg.2019068
    引用本文: 陈怀玉, 张文, 成武. 2019: 基于FLAC3D的煤矿采空区变形数值模拟分析. 工程地质学报, 27(s1): 327-333. DOI: 10.13544/j.cnki.jeg.2019068
    CHEN Huaiyu, ZHANG Wen, CHENG Wu. 2019: NUMERICAL SIMULATION ANALYSIS OF DEFORMATION IN COAL CAVITIES BASED ON FLAC3D. JOURNAL OF ENGINEERING GEOLOGY, 27(s1): 327-333. DOI: 10.13544/j.cnki.jeg.2019068
    Citation: CHEN Huaiyu, ZHANG Wen, CHENG Wu. 2019: NUMERICAL SIMULATION ANALYSIS OF DEFORMATION IN COAL CAVITIES BASED ON FLAC3D. JOURNAL OF ENGINEERING GEOLOGY, 27(s1): 327-333. DOI: 10.13544/j.cnki.jeg.2019068

    基于FLAC3D的煤矿采空区变形数值模拟分析

    NUMERICAL SIMULATION ANALYSIS OF DEFORMATION IN COAL CAVITIES BASED ON FLAC3D

    • 摘要: 本文选取拟建国道丹阿线新华至英安段煤矿采空区作为工程背景,在有限差分软件FLAC3D基础上,建立采空区模型。研究了在自重应力作用下,采空区上覆岩层及地表变形规律,并且得出了开采过程中的应力-应变规律。分析结果表明:由于地下煤层的开采,原有的地质状态发生了变化;最大主应力发生在采空区的边界以及顶板位置,出现了明显的应力集中现象,在顶板的上部,其最大主应力呈现出从上至下逐渐增大的变化趋势,主应力主要表现为压应力;在采空区的顶板位置最容易发生沉降变形破坏,越靠近采空区的顶部位置,产生的垂向位移则越大,岩层随着远离采空区,产生的垂向位移则逐渐减少;塌陷盆地不对称,地表沉降位移的最大值发生在塌陷盆地中部、偏于下山方向;多层采空区开采结束后,沉降位移达到最大值,最大位移达到了791 mm。通过概率积分法的理论计算,得到研究区域最大沉降值为830 mm,得出概率积分法和FLAC3D数值模拟方法两者的结果相互吻合。

       

      Abstract: The paper selected the goaf located at Xinhua-Ying'an section of planned Dandong-Altai National Highway as the engineering background. We established the goaf model based on a finite difference software(FLAC3D)to study the deformation pattern of the overburden layer and ground surface under geostatic stress. We also obtained the stress-strain pattern in the mining process. The analysis results show that the original geological state is changed due to the exploitation of underground coal seams. The maximum principal stress occurs at the boundary of the goaf and the roof, and obvious stress concentration occurs. In the upper part of the roof, the maximum principal stress gradually increases from the top to the bottom, and compressive main stress is predominant. Settlement deformation and failure are most likely to occur at the roof of goaf, and the vertical displacement increases with the reduction of the distance to the top of the goaf and vice versa. The vertical displacement of the rock formation with the away from the goaf is gradually reduced. The subsidence basin is asymmetrical. The maximum displacement of the surface subsidence occurs at the downhill side of the middle of the subsidence basin. The settlement displacement reaches a maximum value of 791 mm after the mining of the multi-level goaf. We calculated the maximum settlement value of the study area by the theoretical calculation of the probability integral method, and the calculation result is 830 mm, which is consistent with the result got by FLAC3D numerical simulation method.

       

    /

    返回文章
    返回