裂隙岩体注浆结石体收缩变形与抗剪强度

发布时间：2018-02-25 16:33

本文关键词： 注浆结石体裂隙抗剪强度收缩变形　出处：《科学技术与工程》2016年36期 　论文类型：期刊论文

【摘要】：为了提高裂隙岩体的力学性能,保证工程的质量和安全,采用水玻璃-水泥混合注浆液对裂隙岩体进行加固。通过直剪试验、显微镜实时观测试验,研究注浆结石体的强度与变形特性,以此评价水玻璃-水泥混合液作为注浆材料的可行性。试验结果表明,水玻璃-水泥混合注浆液有效的提高了裂隙岩体的力学性能。水玻璃-水泥注浆溶液不但改变了裂隙岩体的微结构、裂隙率和岩体的物质组成成分,使岩体的致密度和强度增加;而且注浆溶液在岩体结构面中凝固后对结构面进行填充加固,有效的提高了注浆结石体的黏聚力c,增强了注浆结石体抵抗外力破坏的能力。裂隙率对注浆结石体的强度影响显著,随裂隙岩体裂隙率的增加,注浆结石体(裂隙岩体与注浆材料经过物理化学变化后形成的结合体)的抗剪强度减小;在裂隙率相差不大时,裂隙岩体的裂隙条数对注浆结石体的抗剪强度有重大影响,随着裂隙条数的增加,注浆结石体的抗剪强度减小。在注浆结石体抗剪强度减少过程中,注浆结石体的黏聚力c不断减小,内摩擦角φ基本保持不变。注浆结石体在第12 d时达到最佳抗剪强度,而水玻璃-水泥质量比为1.3∶1注浆液工程性能最为理想,期最佳抗剪强度为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.
【作者单位】：武汉轻工大学多孔介质力学研究所;
【基金】：国家自然科学基金(51474168)资助
【分类号】：TU45

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