文献类型：期刊文献

中文题名：FLAC^3D中Cable数量对锚杆拉拔模拟试验结果的影响

英文题名：Effect of Cable Quantity in FLAC^3D on Rock Bolt Pull-out Simulation Results

作者：杜学领

第一作者：杜学领

机构：[1]贵州理工学院矿业工程学院,贵州贵阳550003

第一机构：贵州理工学院矿业工程学院

年份：2020

卷号：51

期号：7

起止页码：215-220

中文期刊名：煤矿安全

外文期刊名：Safety in Coal Mines

收录：CSTPCD;;北大核心:【北大核心2017】；

基金：贵州理工学院高层次人才科研启动经费资助项目(0203001018029);国家安监总局2018年安全生产重大事故防治关键技术科技资助项目(guizhou-0005-2018AQ);国家自然科学基金地区基金资助项目(51764010)。

语种：中文

中文关键词：FLAC^3D;锚杆支护;数值模拟;巷道支护;拉拔试验

外文关键词：FLAC^3D;rock bolt reinforcement;numerical simulation;roadway support;pull-out test

摘要：为研究相同锚杆长度时Cable数量对模拟结果的影响,采用FLAC^3D中的Cable结构单元建立锚杆模型,并在相同围岩属性、网格密度、边界条件等条件下,通过拉拔模拟试验研究Cable数量和锚固剂刚度对结果的影响。结果表明:按照FLAC^3D帮助手册中根据development length设置Cable数量的建议并不可靠;对相同长度锚杆划分为不同Cable数量时,模拟结果有明显不同;当单一Cable长度与网格长度划分一致或比网格更短时,锚杆能获得较大的拉拔轴力;可以根据现场拉拔试验确定锚杆的极限拉拔力,然后在数值模拟中设定单一Cable长度为网格长度的0.5~1倍之间寻找与现场试验相符合的模拟方案;锚固剂刚度变化对锚杆轴力的峰值影响并不显著,但会改变轴力的峰后变化特征。
In order to study the influence of the number of cables on the simulation results when the same length of the bolt is prepared,the bolt is created by using the Cable structure element in FLAC^3D,and the simulation experiment is carried out under the same surrounding rock properties,mesh density and boundary conditions.The effect of the number of cables and the effect of grout stiffness was further explored.The results show that the recommendation to set the number of cables according to the development length in FLAC^3Dhelp manual is not reliable.When the same length of the bolt is divided into different numbers of cables,the simulation results are significantly different.When the length of a single cable is consistent with the length of the mesh or shorter than the mesh,the bolt can obtain a large pulling axial force.The ultimate pull-out force of the bolt can be determined according to the on-site pull-out test,and then a single cable length is set to be between 0.5 and 1 times the length of the grid in the numerical simulation to find a simulation scheme consistent with the field test.The change of grout stiffness has no significant effect on the peak force of the bolt axial force,but it will change the post-peak variation characteristics of the axial force.