郑州市某高速公路下方采空区稳定性分析与评价

发布时间：2018-05-20 01:00

本文选题：郑州市 + 高速公路　；参考：《西安科技大学》2017年硕士论文

【摘要】：本论文以焦铜高速至小訾殿穿越南官庄煤矿采空区的稳定性为研究背景,通过对该煤矿工程地质条件分析,采取经验公式计算评价路基稳定性,并利用GTS数值模拟对煤层采空区及地表的应力与变形规律进行研究。在以上基础上,分析煤矿采空区对高速公路改扩建工程的影响以及采空区处理措施问题,主要得出以下结论:(1)该煤矿开采方式为走向长臂后退式开采,全部陷落法顶板管理,木质支护,回采率较低。该矿自2005年底一直处于停采状态。研究区内煤矿及老煤窑主采区的采煤深度在70m～127m之间,煤层平均厚度为5m。煤层采空区为单层采空区,平均倾角为20°。根据实地调查,地面发现沉降裂缝、以及采空区塌陷坑,采空变形还没有完成。(2)研究区煤层采深采厚比为23～42,采空区地表极易产生突发性的塌陷坑和沉降盆地。通过经验公式就算得出,该采空区最大剩余地表沉降量为0.48m,最大剩余地表水平位移量为0.14m,最大剩余水平变形值为2.7～6.8 mm/m,剩余倾斜值为6.1～10.9mm/m,剩余曲率值为±0.04～±0.38mm/m2,研究区属于路基不稳定区,建议采取措施对其进行治理。(3)利用GTS软件进行数值模拟,结果显示煤层采出后地表最大沉降量达到-1.43～-3.1m,最大水平位移量达到-0.64m～0.77 m。改建高速公路修筑以后,在长期附加荷载作用下,路基下方最大剩余地表沉降量为-0.32～-0.45m,最大剩余地表水平位移量为-0.1～-0.13 m,采空区区域附近煤柱在荷载作用下会产生破坏失稳,剩余水平和沉降变形量严重威胁拟建公路安全。(4)通过采空区治理方案比较,建议采取注浆法对采空区进行治理。利用GTS数值模拟方法对注浆后采空区的应力和变形特征进行分析,计算结果表明:采用注浆法对煤层采空区治理加固后,最大剩余地表沉降量和最大水平位移量都大幅度降低,能够达到治理预期的效果。
[Abstract]:In this paper, based on the research background of the stability of the mined-out area in Nanguanzhuang Coal Mine from the high speed of Jiao Copper to the Xiaodian Temple, through the analysis of the engineering geological conditions of the coal mine, the stability of the roadbed is calculated and evaluated by the empirical formula. The stress and deformation of coal seam goaf and surface are studied by GTS numerical simulation. On the basis of the above, the influence of goaf on highway reconstruction and extension project and the treatment measures of goaf are analyzed. The main conclusions are as follows: 1) the mining mode of this coal mine is long arm backward mining, all roof management of falling method. Wood support, the recovery rate is low. The mine has been in a state of stoppage since the end of 2005. The coal mining depth in the main mining area of coal mine and old coal kiln is between 70m~127m and the average thickness of coal seam is 5 m. The goaf of coal seam is a single-layer goaf with an average inclination of 20 掳. According to field investigation, subsidence cracks and subsidence pits in goaf are found on the ground. The mining deformation has not been completed. The mining depth mining thickness ratio in the study area is 23 ~ 42.The surface of goaf is prone to produce sudden collapse pits and subsidence basins. The empirical formula shows that the maximum residual surface subsidence is 0.48 m, the maximum residual surface displacement is 0.14 m, the maximum residual horizontal deformation is 2.76.8mm / m, the residual tilt value is 6.1 ~ 10.9mm / m, and the residual curvature is 卤0.04 ~ 卤0.38mm / m ~ 2. It is suggested that measures should be taken to control it. (3) numerical simulation is carried out by using GTS software. The results show that the maximum subsidence of coal seam after mining is -1.43 ~ 3.1mand the maximum horizontal displacement is -0.64m- 0.77m. After rebuilding the expressway, under the action of long-term additional load, the maximum residual surface settlement under the roadbed is -0.32 ~ 0.45 m, and the maximum residual horizontal displacement is -0.1 ~ 0.13 m. The coal pillar near the goaf area will be destroyed and unstable under the load. The residual level and settlement deformation seriously threaten the safety of the proposed highway. (4) through the comparison of goaf treatment schemes, it is suggested that the goaf should be treated by grouting method. The GTS numerical simulation method is used to analyze the stress and deformation characteristics of goaf after grouting. The results show that the maximum residual surface subsidence and the maximum horizontal displacement are greatly reduced after the grouting method is used to reinforce the goaf in coal seam. Can achieve the desired effect of governance.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U412.22

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