中间主应力影响下加锚试样应力-应变曲线特征参数分析  

Characteristic Parameters Analysis of Stress-strain Curve Bolted Specimens under Influence of Intermediate Principal Stress

作　　者：蒋培林 丁书学 南华[3] 乔静 刘江 田永超 李佳赛 李树杰 JIANG Pei-lin;DING Shu-xue;NAN Hua;QIAO Jing;LIU Jiang;TIAN Yong-chao;LI Jia-sai;LI Shu-jie(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Henan Key Laboratory of Underground Engineering and Disaster Prevention,Jiaozuo 454003,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;China Road and Bridge Corporation Branch in Georgia,Tbilisi 0422,Georgia)

机构地区：[1]河南理工大学土木工程学院,焦作454003 [2]河南省地下工程与灾变防控重点实验室,焦作454003 [3]河南理工大学能源科学与工程学院,焦作454003 [4]中国路桥集团格鲁吉亚分公司,第比利斯0422,格鲁吉亚

出　　处：《科学技术与工程》2023年第18期7725-7733,共9页Science Technology and Engineering

基　　金：国家自然科学基金(52178388);河南理工大学博士基金(B2019-35);河南省青年基金(212300410146)。

摘　　要：为探究锚杆加固、中间主应力和岩石强度对试样应力-应变曲线特征参数的影响,采用电液伺服双轴压缩试验机对不同中间主应力影响下无锚和两种强度的加锚类岩石试样的应力-应变曲线特征参数进行了试验研究。研究结果表明:加锚能够提高试样刚度和降低试样脆性,单轴抗压强度UCS=25.4 MPa的试样加锚后的刚度角、强化角和韧度角分别提高1.36%、0.89%和50.8%,脆度角和软化角分别降低0.2%和1.43%。中间主应力增加能够提高试样强度和刚度、降低试样脆性,中间主应力由4.44 MPa提高到17.78 MPa时,UCS=25.4 MPa的加锚试样屈服强度、峰值强度和残余强度分别提高94.2%、41.89%和20.16%;刚度角、强化角和韧度角分别提高1.69%、0.76%和74.21%;脆度角和软化角分别降低2.96%和2.44%。岩样强度提高对试样刚度和脆性有显著提升作用,和UCS=23.8 MPa的加锚试样比,UCS=25.4 MPa的加锚试样的刚度角、脆度角、强化角和软化角分别增加1.18%、0.72%、1.28%和3.95%,韧度角降低46.8%。研究结果促进了对中间主应力影响下加锚围岩强度和变形规律的认识,对巷道稳定性控制和灾变防控具有一定的参考作用。In order to explore the influence of bolt reinforcement,intermediate principal stress and rock strength on the characteristic parameters of stress-strain curve of rock samples,an electro-hydraulic servo biaxial compression testing machine was used to test and study the characteristic parameters of stress-strain curve of unbolted rock samples and bolted samples with two kinds of strength under the influence of different intermediate principal stresses.The results show that bolt reinforcement can improve the stiffness and reduce the brittleness of the specimen.After anchoring,the stiffness angle,strengthening angle and toughness angle of the specimen with UCS=25.4 MPa are increased by 1.36%,0.89%and 50.8%,respectively,while the brittleness angle and softening angle decrease by 0.2%and 1.43%,respectively.The increase of the intermediate principal stress can improve the strength and stiffness of the specimen and reduce the brittleness of the specimen.When the intermediate principal stress increases from 4.44 MPa to 17.78 MPa,the yield strength,peak strength and residual strength of the bolted specimen with UCS=25.4 MPa increase by 94.2%,41.89%and 20.16%,respectively.Stiffness angle,strengthening angle and toughness angle are increased by 1.69%,0.76%and 74.21%,respectively.The brittleness angle and softening angle decrease by 2.96%and 2.44%,respectively.The increase of rock strength can significantly improve the stiffness and brittleness of the sample.Compared with the bolted specimen with UCS=23.8 MPa,the stiffness angle,brittleness angle,strengthening angle and softening angle of the bolted specimen with UCS=25.4 MPa increase by 1.18%,0.72%,1.28%and 3.95%,respectively,while the toughness angle decreases by 46.8%.This study promotes the understanding of the strength and deformation law of anchored surrounding rock under the influence of intermediate principal stress.It has a certain reference function for roadway stability control and disaster prevention and control of underground engineering.

关 键 词：岩石力学 加锚试样 中间主应力 应力-应变曲线 特征参数 

分 类 号：TD353[矿业工程—矿井建设]