不同水灰比浆液加固节理面卸载诱发滑移试验研究

doi:10.13722/j.cnki.jrme.2024.0078

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摘要为了探究卸载诱发滑移条件下不同水灰比浆液加固对花岗岩节理面滑移特性的影响，本试验对含节理花岗岩进行不同水灰比水泥浆液加固，开展恒定轴压分级卸载围压的诱发滑移试验。试验结果表明：(1) 无填充节理面进行三维形貌扫描发现，滑移前节理面算术平均高度、均方根高度和峰度系数分别为5.744，7.554和11.106，滑移破坏后分别为13.999，17.586和5.431。节理面表面的高度差增大，条纹状割痕逐渐消失。(2) 使用SEM扫描电镜观察加固节理面微观破坏面，发现水灰比升高，水泥骨架强度降低，浆液流动性增强，水泥–岩石互锁结构微观破坏形式发生改变。(3) 水灰比0.5，0.7和1.0浆液加固节理面，在相同围压下剪切应力峰值依次为28.067，15.609和8.863 MPa，在诱发滑移阶段的剪切位移依次为0.072，0.050和0.061 mm。加固节理面抗剪强度和抗滑移变形能力均得到提升。(4) 加固节理面缓慢蠕变滑移产生能耗，改善未加固节理面应变能快速释放产生的黏滑现象。根据试验结果分析：水灰比降低，水泥–岩石互锁结构面通过蠕变滑移耗散的能量更多。当水灰比为0.7时无扰动蠕变滑动速度最低，形成的互锁结构滑移稳定性更强。

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	孙金源1
	冯现大1
	刘日成2
	3
	李树忱2
	3
	胡明慧2
	卢英瑞1

关键词 ：岩石力学, 卸载诱发滑移, 水灰比, 滑移特性, 注浆加固

Abstract：In order to investigate the effect of different water-cement ratio slurry reinforcement on the slip characteristics of granite joint faces under unloading-induced slip conditions，this test was conducted on granite joint faces reinforced with various water-cement ratios of cement slurry to carry out constant axial pressure graded unloading of circumferential pressure-induced slip tests. The test results show that：(1) The three-dimensional morphology scanning of the unfilled joint surface revealed that the arithmetic mean height ，root-mean-square height and kurtosis coefficient of the joint surface were 5.744，7.554 and 11.106 before slip，and 13.999，17.586 and 5.431 after slip. The height difference of the surface of the joint surface increases，and stripe cuts gradually disappears. (2) Using SEM(scanning electron microscope) to observe the microstructural damage surface of the reinforced joint surface，it was found that with the increase of water-cement ratio，the strength of the cement skeleton decreased，the fluidity of the slurry increased，and the microscopic damage form of the cement-rock structural surface was changed. (3) The peak shear stresses under the same circumferential pressure were 28.067，15.609 and 8.863 MPa for 0.5，0.7 and 1.0 slurry-reinforced joints，and the shear displacements at the induced slip stage were 0.072，0.050 and 0.061 mm in that order. the shear strength and the ability of the joints to resist slip deformations were both improved. (4) The reinforced joint surface generates energy consumption through creep-slip，which improves the stick-slip phenomenon. According to the analysis of the test results：the smaller the water-cement ratio is，the more energy is dissipated through creep in the cement-rock interlocking structure. When the water-cement ratio is 0.7，the undisturbed creep sliding speed is the lowest，and the slip stability of the formed interlocking structure is stronger.

Key words： rock mechanics unloading-induced slip water-cement ratio slip characteristics grouting reinforcement

引用本文:

孙金源1，冯现大1，刘日成2，3，李树忱2，3，胡明慧2，卢英瑞1. 不同水灰比浆液加固节理面卸载诱发滑移试验研究[J]. 岩石力学与工程学报, 2024, 43(S2): 3792-3807.
SUN Jinyuan1，FENG Xianda1，LIU Richeng2，3，LI Shuchen2，3，HU Minghui2，LU Yingrui1. Unloading-induced slip of jointed surfaces reinforced with slurries of different water-cement ratios experimental study#br#. , 2024, 43(S2): 3792-3807.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2024.0078 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/IS2/3792

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