摘要
为了揭示裂隙岩体在注浆前后的剪切破坏特征,为大型岩体工程的安全稳定运行提供重要的理论依据。建立了考虑液压加载系统-剪切盒-岩石节理之间荷载传递过程的计算模型,开发了综合时间效应和尺寸效应的裂隙扩展与注浆支护过程的有限元-离散元耦合方法(finite-discrete element method,FDEM),分别在实验室尺度和工程尺度开展了裂隙岩体剪切破裂过程数值模拟。研究结果表明:节理面越粗糙,产生的裂纹越多,损伤区域的范围越大;节理试样在注浆前后的剪切强度、损伤分布、破坏模式等发生了根本性的变化;巷道顶部和拱底两犄角处首先产生剪切裂隙,裂隙逐渐在巷道周边贯穿,扩展深部达到1.5倍巷道直径;考虑尺寸效应时,裂隙数量明显增多且分布更加密集,裂隙扩展深度明显增大,基本上达到1.4倍巷道直径;注浆可以显著减小围岩的变形,控制裂隙的发育,增强巷道的稳定性和抵抗破坏的能力。
In order to explore the shear failure characteristics of fractured rock mass pre-and post-grouting,delivering essential theoretical support for the safe and stable functioning of large-scale rock engineering projects.A computational model considering the load transfer process among the hydraulic loading system,shear box,and rock joints was established,and a FDEM(finite-discrete element method)coupling algorithm for crack propagation and grouting support process that integrates time and size effects was developed.Numerical simulations of the shear fracture process of fractured rock masses were carried out at both laboratory and engineering scales.Main conclusions are these as follows.The rougher the joint,the more cracks are produced and the greater the extent of the damaged area;Significant changes in shear strength,damage distribution and damage pattern of joint specimens before and after grouting;Shear cracks are first generated at the top and bottom of the archway,which gradually run through the periphery of the roadway,expanding to a depth of 1.5 times the diameter of the roadway;When the size effect is taken into account,the number of cracks increases significantly and the distribution is more dense,and the depth of crack extension increases significantly,basically reaching 1.4 times the diameter of the roadway;Grouting can significantly reduce the deformation of the surrounding rock,control the development of cracks,and enhance the stability of the roadway.
作者
李国栋
阚雪冬
刘明昭
王震
朱开鹏
刘英锋
张文忠
马荷雯
李洁祥
田永超
LI Guo-dong;KAN Xue-dong;LIU Ming-zhao;WANG Zhen;ZHU Kai-peng;LIU Ying-feng;ZHANG Wen-zhong;MA He-wen;LI Jie-xiang;TIAN Yong-chao(School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China;Zhaogu No.1 Coalmine,HNEC Coking Coal Company,Xinxiang 453634,China;CCTEG Xi'an Research Institute Co.,Ltd.,Xi'an 710077,China;School of Resources and Environment,Henan Polytechnic University,Jiaozuo 454003;School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454003,China)
出处
《科学技术与工程》
北大核心
2025年第23期9935-9952,共18页
Science Technology and Engineering
基金
国家自然科学基金青年科学基金(42307259)。
关键词
裂隙岩体
注浆
直剪试验
有限元
离散元
fractured rock mass
grouting
direct shear test
finite element
discrete element
