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S_(a)、均方根高度S_(q)和峰度系数S_(ku)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。
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 S_(a),root-mean-square height S_(q)and kurtosis coefficient S_(ku)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 creepslip,which improves the stick-slip phenomenon.According to the analysis of the test results:the smaller the watercement 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.
作者
孙金源
冯现大
刘日成
李树忱
胡明慧
卢英瑞
SUN Jinyuan;FENG Xianda;LIU Richeng;LI Shuchen;HU Minghui;LU Yingrui(School of Civil Engineering and Architecture,University of Jinan,Jinan,Shandong 250000,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2024年第S02期3792-3807,共16页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(52379102,52379113)
关键词
岩石力学
卸载诱发滑移
水灰比
滑移特性
注浆加固
rock mechanics
unloading-induced slip
water-cement ratio
slip characteristics
grouting reinforcement
作者简介
孙金源(1999-),男,2022年毕业于济南大学土木工程专业,现为硕士研究生,主要从事岩石力学方面的研究工作。E-mail:603053169@qq.com;通讯作者:冯现大(1985-),博士,现任副教授。E-mail:cea_fengxd@ujn.edu.cn
