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注浆技术对裂隙岩体的加固效果显著,对岩体裂隙面的力学特性产生极大影响。为研究注浆加固对岩体裂隙力学特性的影响规律,创新性地提出一种岩体裂隙试件制作方法,克服了原岩裂隙取样困难的难题。将该方法制取的裂隙试件在自主研发的裂隙岩体注浆系统平台上进行注浆加固试验,并对注浆加固后的岩体裂隙试件开展相关的法向及切向力学加载试验。试验结果表明:人工制取的裂隙试件与原岩裂隙几何相似性良好,符合室内物理试验要求;注浆加固会显著改变岩体裂隙面的法向切向力学特性,注浆加固后岩体裂隙的峰值抗剪强度及残余强度得到极大提高,裂隙面的抗变形能力增强;裂隙面法向加载会影响其切向力学行为,切向抗剪强度随法向应力增加而增加;注浆加固通过提高岩体裂隙面的力学性能来增加岩体的整体强度及稳定性。
The grouting technology has a significant effect on the reinforcement of fractured rock masses and has a great influence on the mechanical properties of rock fracture planes. In order to study the influence of grouting reinforcement on the mechanical characteristics of rock mass fissures, a new method of making rock mass fissures was proposed, which overcomes the difficulty of sampling the fracture of original rock. The fractured specimens prepared by this method are grouted and reinforced on the self-developed grouting system platform of fractured rock mass, and the relevant normal and tangential mechanical loading tests are carried out on grouted and fractured rock specimen . The experimental results show that the geometrical similarity between fractured specimens and original fractures is good, which accords with the requirements of indoor physical experiment. The grouting reinforcement can significantly change the normal tangential mechanical properties of fractured rock mass. After grouting reinforced rock mass The peak shear strength and residual strength of the crack are greatly enhanced, and the anti-deformation ability of the crack surface is enhanced. The normal load of the crack surface will affect the tangential mechanical behavior, and the shear strength of the crack increases with the increase of the normal stress. Reinforcement increases the overall strength and stability of the rock mass by increasing the mechanical properties of the rock mass.