發(fā)布時間：2018-05-02 16:00

  本文選題：粘塑性支座 + 接頂充填��； 參考：《西安科技大學(xué)》2015年碩士論文

【摘要】：現(xiàn)今沿空留巷隔離墻兩種充填模式中剛性充填方式會造成充填體變形不能匹配圍巖變形;柔性充填方式不易控制充填體的變形。針對此問題,本文提出了一種新型粘塑性支座隔離墻。這種隔離墻主體結(jié)構(gòu)為高強(qiáng)度以提供較高的支護(hù)阻力,頂部支撐接觸面為粘塑性膠凝體能達(dá)到密封、變形讓壓保護(hù)支護(hù)主體。兩種充填材料的組合而成的新型隔離墻解決了沿空留巷的礦壓耦合適應(yīng)性和密封性問題。本文通過對巷道圍巖變形規(guī)律的分析,支護(hù)前期巷旁支護(hù)體要具備足夠的切頂阻力。同時,巷旁充填體在達(dá)到極限的承載能力后,其自身要具備一定的可縮量。提出主體采用高強(qiáng)早硬混凝土結(jié)構(gòu),頂部采用粘塑性材料的粘塑性支座隔離墻。通過“疊加層板”原理進(jìn)行了巷旁支護(hù)阻力的計算,從而確定出頂部材料的要求。采用理論分析、實驗室試驗、數(shù)值模擬等方法對新型粘塑性支座隔離墻進(jìn)行了研究。根據(jù)隔離墻頂部材料的特性需要,分析了各種配比成分對其物理力學(xué)性能的影響程度,采用正交設(shè)計法優(yōu)化配比。新型粘塑性接頂材料是在普通混凝土中加入膨潤土、粉煤灰和活性添加劑。頂部充填材料可保持長時間流動性,凝結(jié)時間滿足工程需要。混凝土28d抗壓強(qiáng)度可達(dá)20.34MPa,彈性模量可降低至1690 MPa。通過MIDAS/GTS軟件對接頂充填隔離墻和整體隔離墻巷道周圍圍巖位移變形、應(yīng)力分布及塑性區(qū)域進(jìn)行模擬對比,結(jié)果表明頂部充填隔離墻具有較好的性能;所以新型隔離墻技術(shù)因其早撐早強(qiáng)的特性能夠適應(yīng)巷道頂板變形規(guī)律,支護(hù)效果顯著,因此具有廣泛的應(yīng)用前景。
[Abstract]:In the two filling modes of the wall wall along the goaf, the rigid filling mode will cause the deformation of the filling body not to match the deformation of the surrounding rock, and the flexible filling method is difficult to control the deformation of the filling body. In order to solve this problem, a new viscoplastic support wall is proposed in this paper. The main structure of the wall is high strength to provide high support resistance, the top supporting contact surface is viscoplastic cementing physical ability to seal, and the deformation allows pressure to protect the main body of the support. The new wall formed by the combination of two kinds of filling materials solves the problems of coupling adaptability and sealing of mine pressure along goaf roadway. Based on the analysis of the deformation law of roadway surrounding rock, enough roof cutting resistance is required for the supporting body beside roadway in the early stage of support. At the same time, after reaching the ultimate bearing capacity, the backfill should have a certain amount of shrinkage. The viscoplastic wall with high strength early hardening concrete structure and viscoplastic material at the top of the wall is put forward. Based on the principle of "superposition laminate", the resistance of roadway side support is calculated, and the requirement of top material is determined. The new viscoplastic support wall is studied by theoretical analysis, laboratory test and numerical simulation. According to the characteristics of the material at the top of the wall, the influence of various proportioning components on the physical and mechanical properties of the wall is analyzed, and the orthogonal design method is used to optimize the proportion. The new viscoplastic top joint material is the addition of bentonite, fly ash and active additives in ordinary concrete. Top filling material can maintain long time flow, setting time to meet engineering needs. The compressive strength of concrete can reach 20.34 MPA and the elastic modulus can be reduced to 1690 MPA. The displacement and deformation, stress distribution and plastic region of surrounding rock around the wall wall are simulated and compared by MIDAS/GTS software. The results show that the top filling wall has better performance. Therefore, the new wall technology can adapt to the roof deformation law of roadway because of its characteristics of early supporting and early strength, so it has a wide application prospect.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD322.4;TD353

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