摘要
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。
Grouting technique reinforced the fractured rock mass significantly, and it has a great effect on the mechanical properties of rock fracture surface. A fractured rock specimen production method was presented to study the influence of grouting on mechanical properties of fractured rock mass, overcoming the difficult problems of the original rock fissure sampling. The grouting reinforcement test was carried out with the self-developed fractured rock mass grouting platform, in which the fractured specimens produced with the proposed method The normal-shear loading tests were carried out. It is indicated that artificial fractured specimens and original rock fissures are of good geometric similarity, satisfying indoor physical test requirements. The normal and tangential mechanical properties are changed significantly by grouting reinforcement. After grouting, the peak shear strength and residual strength of rock fractures and the resistance to deformation of fracture surface increase greatly. The normal load will affect tangential behavior of fissure, tangential strength increases with the normal loading. The overall strength and stability of the rock mass increase by the grouting with the enhancement of mechanical properties of rock fractures.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2017年第A01期3140-3147,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金重点项目(41130742)
国家自然科学基金面上项目(51474205)~~
关键词
岩石力学
注浆加固
岩体裂隙
力学性质
rock mechanics
grouting reinforcement
rock fracture
mechanical properties
