文献类型：期刊文献

中文题名：基于3D打印和数字散斑技术的节理岩体锚固效应分析

英文题名：Research on anchoring effect of jointed rock mass based on 3D printing and digital speckle technology

作者：薛飞[1];刘小霞[1];王天佐[1]

机构：[1]绍兴文理学院土木工程学院浙江省岩石力学与地质灾害重点实验室,浙江绍兴312000

年份：2021

卷号：3

期号：2

起止页码：91

中文期刊名：采矿与岩层控制工程学报

外文期刊名：Journal of Mining and Strata Control Engineering

收录：CSTPCD、、EI(收录号：20241015702653)、北大核心、北大核心2020

基金：浙江省自然科学基金资助项目(LQ20E080006)。

语种：中文

中文关键词：单轴压缩试验;3D打印;数字散斑;节理角度;

外文关键词：uniaxial compression test;3D printing;digital speckle;joint angle;

中文摘要：为研究锚杆对节理岩体的锚固力学效应,基于3D打印技术制作了以矿用锚杆为原型的缩尺锚杆和含预制节理面的制样模具,进而制备了2组不同角度的节理锚固试样,并采用数字散斑(DIC)方法监测了试样在单轴压缩试验过程中表面位移及应变场的变化,对比分析了不同节理角度锚固岩体的变形与强度特性和锚固力学效应。试验结果表明:节理角度对岩体强度和变形特性具有显著影响,节理的存在会降低岩体的承载能力,节理角度为15°和60°岩体的强度分别为不含节理完整岩体的34%和19%,节理岩体的应力应变曲线表现出显著的多峰性。当节理角度为15°时,试样破坏模式以压缩劈裂为主,试样整体承载力受块体自身强度影响较大,锚杆的加固作用不显著;当节理角度为60°时,试样破坏模式则以剪切破坏为主,锚杆的加固作用明显,此时锚杆除了杆体的黏结及抗剪作用外,还借助装配在锚杆两侧的托盘给锚固试样提供一定的侧向约束,从而维持结构的整体承载性能。DIC方法形象直观地再现了锚固节理岩体加载全过程中裂隙发展和剪切滑移的全过程,当节理角度为15°时,Exx和Eyy应变场呈现与试样表面裂隙高度吻合的应变集中区域,节理面两侧的应变集中则不显著;而当节理角度增大至60°后,Exx和Eyy应变场在节理面两侧区域高度集中,呈现出3色剪切带,验证了节理面角度对试样发生剪切行为起着重要的控制作用,角度越大试块剪切运动越明显,研究结果可为节理岩体锚杆加固机理的相关研究提供参考。

外文摘要：In order to study the rockbolt reinforcement mechanical effect on jointed rock mass,some scaled bolts based on the prototype of mine bolt and molds with prefabricated joint surface were made using on 3D printing technology.Two kinds of joint anchorage samples with different angles were prepared and the change of surface strain displacement field during uniaxial compression test was captured using digital image correlation(DIC)monitoring method.The deformation and strength characteristics and anchoring mechanical effects of rock mass with two different angle anchorage joints were compared and analyzed.The results indicate that the joint angle has a significant influence on the strength and deformation characteristics of rock mass,the existence of joint reduces the bearing capacity of the rock mass.The strength of jointed rock mass at 15°and 60°is 34%and 19%of the intact rock mass without jointing,respectively,and the stress-strain curves of jointed rock mass show a striking multi-peak characteristic.When the joint plane angle is 15°,the failure mode of the sample is mainly compression splitting,the overall bearing capacity of the sample is greatly affected by the strength of the test block,and the reinforcement effect of the bolt is not significant.When the angle of joint surface is 60°,the failure mode of the sample is mainly shear failure,and the reinforcement effect of the bolt is obvious.At this time,in addition to the bond and shear resistance of the bolt body,the bolt also provides certain lateral support to the anchored sample by means of pallets mounted on both sides of the bolt,so as to maintain the overall bearing capacity of the structure to a certain extent.DIC method vividly and intuitively reproduced the whole process of fracture development and shear slip in the whole loading process of anchoring jointed rock mass.When the joint angle is 15°,the strain fields of Exx and Eyy show a strain concentration area highly consistent with the cracks on the surface of the sample,but the strain concentration on both sides of the joint surface is not significant.However,when the joint angle increases to 60°,the strain fields of Exx and Eyy are highly concentrated on both sides of the joint surface,presenting a tri-color shear zone.It proves that the angle of joint surface plays an important role in controlling the shear behavior of the sample,and the larger the angle,the more obvious the shear movement of the sample.The results of this study can provide a reference for the related research on the rockbolt reinforcement mechanism in jointed rock mass.