發(fā)布時(shí)間：2018-02-25 16:33

  本文關(guān)鍵詞： 注漿 結(jié)石體 裂隙 抗剪強(qiáng)度 收縮變形　出處：《科學(xué)技術(shù)與工程》2016年36期 　論文類(lèi)型：期刊論文

【摘要】：為了提高裂隙巖體的力學(xué)性能,保證工程的質(zhì)量和安全,采用水玻璃-水泥混合注漿液對(duì)裂隙巖體進(jìn)行加固。通過(guò)直剪試驗(yàn)、顯微鏡實(shí)時(shí)觀測(cè)試驗(yàn),研究注漿結(jié)石體的強(qiáng)度與變形特性,以此評(píng)價(jià)水玻璃-水泥混合液作為注漿材料的可行性。試驗(yàn)結(jié)果表明,水玻璃-水泥混合注漿液有效的提高了裂隙巖體的力學(xué)性能。水玻璃-水泥注漿溶液不但改變了裂隙巖體的微結(jié)構(gòu)、裂隙率和巖體的物質(zhì)組成成分,使巖體的致密度和強(qiáng)度增加;而且注漿溶液在巖體結(jié)構(gòu)面中凝固后對(duì)結(jié)構(gòu)面進(jìn)行填充加固,有效的提高了注漿結(jié)石體的黏聚力c,增強(qiáng)了注漿結(jié)石體抵抗外力破壞的能力。裂隙率對(duì)注漿結(jié)石體的強(qiáng)度影響顯著,隨裂隙巖體裂隙率的增加,注漿結(jié)石體(裂隙巖體與注漿材料經(jīng)過(guò)物理化學(xué)變化后形成的結(jié)合體)的抗剪強(qiáng)度減小;在裂隙率相差不大時(shí),裂隙巖體的裂隙條數(shù)對(duì)注漿結(jié)石體的抗剪強(qiáng)度有重大影響,隨著裂隙條數(shù)的增加,注漿結(jié)石體的抗剪強(qiáng)度減小。在注漿結(jié)石體抗剪強(qiáng)度減少過(guò)程中,注漿結(jié)石體的黏聚力c不斷減小,內(nèi)摩擦角φ基本保持不變。注漿結(jié)石體在第12 d時(shí)達(dá)到最佳抗剪強(qiáng)度,而水玻璃-水泥質(zhì)量比為1.3∶1注漿液工程性能最為理想,期最佳抗剪強(qiáng)度為6.243 MPa。
[Abstract]:In order to improve the mechanical properties of fractured rock mass and ensure the engineering quality and safety, the water-glass cement grouting fluid is used to reinforce the fractured rock mass. The strength and deformation characteristics of grouting stone are studied to evaluate the feasibility of water-glass cement mixture as grouting material. The mechanical properties of fractured rock mass are improved effectively by water-glass and cement mixed grouting fluid. The water-glass cement grouting solution not only changes the microstructure of fractured rock mass, fracture rate and the composition of rock mass, but also improves the mechanical properties of fractured rock mass. The density and strength of the rock mass are increased, and the grouting solution is filled and strengthened after solidification in the structural plane of the rock mass. The cohesion of grouting stone is improved effectively, and the ability of grouting stone to resist external force failure is enhanced. The fracture rate has a significant effect on the strength of grouting stone body, and with the increase of fracture rate of fractured rock mass, The shear strength of grouting stone (a combination formed by physical and chemical changes of fractured rock mass and grouting material) decreases, and when the crack rate is not different, the number of crack strips in fractured rock mass has a significant effect on the shear strength of grouting stone body. With the increase of the number of cracks, the shear strength of the grouting stone decreases, and the cohesion C of the grouting stone decreases continuously during the process of reducing the shear strength of the grouting stone. The internal friction angle 蠁 remains basically unchanged. The optimum shear strength of the grouting stone is achieved at the 12th day, while the water glass to cement mass ratio of 1.3: 1 is the most ideal, and the best shear strength is 6.243 MPA.
【作者單位】： 武漢輕工大學(xué)多孔介質(zhì)力學(xué)研究所;
【基金】：國(guó)家自然科學(xué)基金(51474168)資助
【分類(lèi)號(hào)】：TU45

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