本文選題：鄭州市 + 高速公路�。� 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：本論文以焦銅高速至小訾殿穿越南官莊煤礦采空區(qū)的穩(wěn)定性為研究背景,通過對(duì)該煤礦工程地質(zhì)條件分析,采取經(jīng)驗(yàn)公式計(jì)算評(píng)價(jià)路基穩(wěn)定性,并利用GTS數(shù)值模擬對(duì)煤層采空區(qū)及地表的應(yīng)力與變形規(guī)律進(jìn)行研究。在以上基礎(chǔ)上,分析煤礦采空區(qū)對(duì)高速公路改擴(kuò)建工程的影響以及采空區(qū)處理措施問題,主要得出以下結(jié)論:(1)該煤礦開采方式為走向長(zhǎng)臂后退式開采,全部陷落法頂板管理,木質(zhì)支護(hù),回采率較低。該礦自2005年底一直處于停采狀態(tài)。研究區(qū)內(nèi)煤礦及老煤窯主采區(qū)的采煤深度在70m～127m之間,煤層平均厚度為5m。煤層采空區(qū)為單層采空區(qū),平均傾角為20°。根據(jù)實(shí)地調(diào)查,地面發(fā)現(xiàn)沉降裂縫、以及采空區(qū)塌陷坑,采空變形還沒有完成。(2)研究區(qū)煤層采深采厚比為23～42,采空區(qū)地表極易產(chǎn)生突發(fā)性的塌陷坑和沉降盆地。通過經(jīng)驗(yàn)公式就算得出,該采空區(qū)最大剩余地表沉降量為0.48m,最大剩余地表水平位移量為0.14m,最大剩余水平變形值為2.7～6.8 mm/m,剩余傾斜值為6.1～10.9mm/m,剩余曲率值為±0.04～±0.38mm/m2,研究區(qū)屬于路基不穩(wěn)定區(qū),建議采取措施對(duì)其進(jìn)行治理。(3)利用GTS軟件進(jìn)行數(shù)值模擬,結(jié)果顯示煤層采出后地表最大沉降量達(dá)到-1.43～-3.1m,最大水平位移量達(dá)到-0.64m～0.77 m。改建高速公路修筑以后,在長(zhǎng)期附加荷載作用下,路基下方最大剩余地表沉降量為-0.32～-0.45m,最大剩余地表水平位移量為-0.1～-0.13 m,采空區(qū)區(qū)域附近煤柱在荷載作用下會(huì)產(chǎn)生破壞失穩(wěn),剩余水平和沉降變形量嚴(yán)重威脅擬建公路安全。(4)通過采空區(qū)治理方案比較,建議采取注漿法對(duì)采空區(qū)進(jìn)行治理。利用GTS數(shù)值模擬方法對(duì)注漿后采空區(qū)的應(yīng)力和變形特征進(jìn)行分析,計(jì)算結(jié)果表明:采用注漿法對(duì)煤層采空區(qū)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,能夠達(dá)到治理預(yù)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 擄. 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 鹵0.04 ~ 鹵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.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U412.22

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本文編號(hào)：1912463