【摘要】：本文針對(duì)淮北礦區(qū)高應(yīng)力、圍巖松散破碎、泥質(zhì)巖性、受水影響顯著等復(fù)雜地質(zhì)條件下的滲水泥化巷道圍巖穩(wěn)定控制技術(shù)難題開(kāi)展了深入研究,通過(guò)深入細(xì)致的工程地質(zhì)調(diào)研,結(jié)合實(shí)驗(yàn)室試驗(yàn)、分子模擬及數(shù)值計(jì)算,分析了高承壓水侵入巷道失穩(wěn)原因,揭示了浸水泥巖泥化流變演化規(guī)律,得到了滲水泥化巷道失穩(wěn)機(jī)理,研發(fā)了適用泥化巷道圍巖控制的安全控制對(duì)策,研究成果如下:(1)通過(guò)深入細(xì)致的現(xiàn)場(chǎng)調(diào)研,發(fā)現(xiàn)巷道是在泥質(zhì)軟巖、地板承壓水及各種應(yīng)力擾動(dòng)的共同作用下出現(xiàn)圍巖泥化流變,最終導(dǎo)致巷道滲流失穩(wěn),其失穩(wěn)變形本質(zhì)上是圍巖滲流場(chǎng)、應(yīng)力場(chǎng)、損傷場(chǎng)三者相互耦合的結(jié)果,而滲流水對(duì)圍巖的侵蝕是巷道變形破壞的關(guān)鍵因素。(2)通過(guò)掃描電鏡與X射線(xiàn)衍射儀對(duì)典型泥巖的微觀結(jié)構(gòu)與物質(zhì)組成進(jìn)行分析,并借助Materials Studio(簡(jiǎn)稱(chēng)MS)軟件建立了蒙脫石的雙晶胞結(jié)構(gòu)模型,揭示了蒙脫石吸附水分子形成1、2、3層飽和水分子層的水化過(guò)程,結(jié)合蒙脫石型泥巖不同浸水程度的微觀結(jié)構(gòu)變化,研究了隨著粘土礦物水化程度加強(qiáng),泥巖微觀顆粒脫落、裂隙增加,致使泥巖在宏觀上出現(xiàn)泥化流變破壞現(xiàn)象的過(guò)程。(3)運(yùn)用MS軟件forcite模塊對(duì)吸附1、2、3層飽和水分子層的蒙脫石模型進(jìn)行分子能量?jī)?yōu)化,發(fā)現(xiàn)蒙脫石分子模型多面體結(jié)構(gòu)發(fā)生不規(guī)則變化,模型總能量大幅度下降,形成能量最小化結(jié)構(gòu)體系,致使泥巖力學(xué)性能降低直至喪失力學(xué)強(qiáng)度,直接導(dǎo)致了泥巖微觀結(jié)構(gòu)發(fā)生破壞,最終形成無(wú)強(qiáng)度的泥化混合物。(4)采用數(shù)值模擬手段研究了滲水泥化巷道位移變化規(guī)律,發(fā)現(xiàn)泥化巷道開(kāi)挖后迅速發(fā)生變形,頂?shù)装寮皟蓭鸵平窟_(dá)到1500mm,巷道凈斷面面積縮小50%,泥化圍巖根本無(wú)法維持巷道穩(wěn)定。(5)針對(duì)滲水泥化巷道失穩(wěn)機(jī)理,制定一套疏水降壓、強(qiáng)化圍巖及構(gòu)造高強(qiáng)度支護(hù)體系的安全控制對(duì)策,其本質(zhì)在于疏導(dǎo)承壓水的基礎(chǔ)上,置換原有的泥化圍巖為混凝土墻體,并配以注漿手段不斷提高泥巖自身整體強(qiáng)度和穩(wěn)定性,從而構(gòu)建多噴漿層、高度密貼巖面的強(qiáng)韌封層結(jié)構(gòu),形成巷道支護(hù)圈體。(6)在淮北礦區(qū)朱仙莊煤礦Ⅱ水平皮帶機(jī)大巷開(kāi)展了滲水泥化巷道治理的驗(yàn)證研究和工業(yè)性試驗(yàn),巷道維控效果良好,表明控制技術(shù)選用得當(dāng),有效保證了巷道的正常使用,取得了良好的經(jīng)濟(jì)與社會(huì)效益。該論文有圖50幅,表6個(gè),參考文獻(xiàn)90篇。
[Abstract]:In this paper, the technical problems of controlling surrounding rock stability of cemented roadway under complex geological conditions, such as high stress, loose broken surrounding rock, muddy lithology and significant influence by water, are studied deeply, and through deep and meticulous engineering geological investigation, the paper makes a thorough research on the stability control of surrounding rock of cemented roadway in Huaibei mining area. Combined with laboratory test, molecular simulation and numerical calculation, the causes of instability of high pressure water intrusion roadway are analyzed, and the rheological evolution law of mudstone soaking is revealed, and the mechanism of instability of cemented roadway is obtained. The research results are as follows: (1) through the thorough and detailed field investigation, it is found that the roadway is in the muddy soft rock. Under the joint action of floor confined water and various stress disturbances, the mudding rheology of surrounding rock appears, which eventually leads to the seepage instability of roadway, which is essentially the result of coupling of surrounding rock seepage field, stress field and damage field. The erosion of surrounding rock by seepage water is the key factor of roadway deformation and failure. (2) the microstructure and material composition of typical mudstone are analyzed by scanning electron microscope and X-ray diffractometer. The double cell structure model of montmorillonite is established by means of Materials Studio (MS) software. The hydration process of montmorillonite adsorbent water molecule forming 1 ~ 2 ~ 2 ~ 3 layer saturated water molecular layer is revealed, and the microstructure changes of montmorillonite mudstone with different degree of water immersion are combined. With the enhancement of hydration degree of clay minerals, the microscopic particles of mudstone fall off and the cracks increase. The process of mudding rheological failure occurred in mudstone macroscopically. (3) using MS software forcite module to optimize the molecular energy of montmorillonite model for adsorbing 1 / 2 layer saturated water molecular layer. It is found that the polyhedron structure of the montmorillonite molecular model changes irregularly, the total energy of the model decreases greatly, and the energy minimization structure system is formed, which results in the decrease of the mechanical properties of mudstone and even the loss of the mechanical strength. It leads directly to the destruction of mudstone microstructure and finally to the formation of non-strength mudding mixture. (4) the displacement law of cemented roadway is studied by numerical simulation, and it is found that the mudstone roadway is rapidly deformed after excavation. The roof and bottom plate and two sides move closer to 1500 mm, the net section area of roadway is reduced by 50%, and the mudded surrounding rock can not maintain the stability of roadway. (5) according to the mechanism of instability of cemented roadway, a set of hydrophobic depressurization is established. To strengthen the safety control measures of surrounding rock and structural high strength support system, its essence lies in replacing the original mudded wall rock with concrete wall on the basis of dredging confined water, and continuously improving the overall strength and stability of mudstone itself with grouting means. Thus, the strong and tough sealing structure of multi-jet layer and highly dense rock surface is constructed, and the supporting ring of roadway is formed. (6) in the roadway of level 鈪，

本文編號(hào)：2162505