岩石结构面注浆加固微观力学机制与浆–岩黏结界面结构优化

doi:10.13722/j.cnki.jrme.2020.0302

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摘要浆–岩黏结界面微观结构及其力学性质从根本上控制着注浆岩石结构面宏观变形与破坏行为。通过开展一系列注浆砂岩结构面的宏观直剪力学试验、微观浆–岩黏结界面SEM扫描试验以及纳米压痕试验，获得注浆砂岩结构面的宏观剪切力学强度参数、剪切破坏模式、浆–岩黏结界面微观结构特征以及浆–岩界面过渡区的力学性质。在此基础上，针对普通水泥浆–岩黏结界面结构缺陷，探究基于超细水泥与纳米SiO2等新型注浆材料的浆–岩黏结界面结构改性与优化机制。研究结果表明：微观尺度上浆–岩黏结界面表现为具有一定厚度尺寸(10～30 μm)的高孔隙率、低强度的界面过渡区；浆–岩界面过渡区是注浆岩石结构面复合体系结构中的最薄弱环节；界面过渡区的微观压痕模量、微观压痕硬度与注浆岩石结构面宏观黏聚力之间存在线性正相关性；新型纳米SiO2与超细水泥等注浆材料能够优化浆–岩黏结界面微观结构，减小界面过渡区的厚度，提高界面过渡区微观力学性能和注浆结构面的宏观黏聚力，但其对注浆结构面的内摩擦角基本无影响。

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	陆银龙
	贺梦奇
	李文帅
	吴秉臻
	王连国

关键词 ：岩石力学, 注浆加固, 直剪试验, 黏聚力, 内摩擦角, 浆&ndash, 岩界面, 微观结构

Abstract：The microstructure and its mechanical properties of grout-rock bonding interfaces fundamentally control the macroscopic deformation and failure behaviors of grouted rock joints. In this paper，a series of macroscopic direct shear tests，microscopic SEM scanning tests and nano-indentation tests were carried out on grouted jointed sandstone specimens. The macroscopic shear mechanical strength parameters，shear failure modes， microstructure characteristics of grout-rock bonding interfaces and micromechanical properties of the interfacial transition zone of the specimens were obtained，and the modification and optimization mechanisms of grout-rock bonding interfaces by using new grouting materials such as ultrafine cement and nano-SiO2 were discussed to overcome the microdefects in grout-rock bonding interfaces resulting from the ordinary Portland cement grout. The results show that the grout-rock interface at the microscale is characterized by high porosity and low strength interfacial transition zone with a certain thickness(about 10–30 μm). The interfacial transition zone is the weakest link in the composite structure of grouted rock joints，and there is a positive linear correlation between the microscopic indentation modulus and microscopic indentation hardness with the macroscopic cohesive force of grouted rock joints. The new grouting materials of ultrafine cement and nano-SiO2 can optimize the microstructure of grout-rock bonding interfaces，reduce the thickness of the interfacial transition zone，thereby improve the micromechanical properties of the interfacial transition zone and the macroscopic cohesive force of the grouted joints，but have little influence on the internal friction angle of the grouted joints.

Key words： rock mechanics grouting reinforcement direct shear test cohesive force internal friction angle grout-rock interface microstructures

引用本文:

陆银龙，贺梦奇，李文帅，吴秉臻，王连国. 岩石结构面注浆加固微观力学机制与浆–岩黏结界面结构优化[J]. 岩石力学与工程学报, 2020, 39(9): 1808-1818.
LU Yinlong，HE Mengqi，LI Wenshuai，WU Bingzhen，WANG Lianguo. Micromechanical mechanisms of grouting reinforcement in rock joints and microstructure optimization of grout-rock bonding interfaces#br#. , 2020, 39(9): 1808-1818.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0302 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I9/1808

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