工程科学学报，第39卷，第4期：494501,2017年4月 Chinese Journal of Engineering,Vol.39,No.4:494-501,April 2017 DOI:10.13374/j.issn2095-9389.2017.04.003:http://journals.ustb.edu.cn 单压下节理密度及倾角对类岩石试件强度及变形的 影响 王佩新”，曹平)区，蒲成志》，范祥》，陈瑜”，王聪聪” 1)中南大学资源与安全工程学院，长沙4100832)南华大学核资源工程学院，衡阳421001 3)长安大学公路学院，西安710064 区通信作者，E-mail:pcao_csu@sina.com 摘要通过预制张开节理类岩石试件，在单轴压缩条件下，研究节理密度及倾角的组合作用对试件强度和变形特征的影 响.试验结果表明：(1)随着节理倾角的增大，应力一应变曲线由多峰值转变为单峰值，试件脆性增强，延性减弱：(2)节理密 度对当量峰值强度的影响与节理倾角大小有关，对当量弹模的影响呈“V”形变化，即当量弹模随着节理密度的增大呈现先减 小后增大的变化规律；(3)当量弹模随节理倾角的增大而增大，在节理倾角为90°的时候达到最大值，为完整试件弹性模量的 70%~80%:(4)节理倾角对多节理类岩石试件当量峰值强度和当量弹性模量的影响大于节理密度的影响.对试验结果进一 步分析发现：节理密度及节理倾角与应力一应变曲线、当量峰值强度及当量弹性模量之间的关系，其变化规律与试件的破坏过 程息息相关，其破坏模式可分为张拉破坏、剪切破坏和复合破坏 关键词类岩石试件；岩石节理；倾角：密度：单轴压缩：峰值强度：弹性模量：破坏模式 分类号TU452 Effect of the density and inclination of joints on the strength and deformation properties of rock-like specimens under uniaxial compression WANG Pei-xin,CAO Ping,PU Cheng-hi,FAN Xiang,CHEN Yu,WANG Cong-eong" 1)School of Resources and Safety Engineering,University of Central South,Changsha 410083,China 2)School of Nuclear Resources Engineering,University of South China,Hengyang 421001,China 3)School of Highway,University of Chang'an.Xi'an 710064,China Corresponding author,E-mail:peao_csu@sina.com ABSTRACT The effects of the combination of joint density and inclination on the strength and deformation characteristics of rock- like specimens containing open joints were studied by using uniaxial compression tests.The following conclusions were made:with the increase of joint inclination,the stress-strain curve changes from a multi-peak value to a single peak value and the brittleness of the specimen enhances,whereas the ductility of the specimen weakens.The influence of joint density on the unified peak strength is relat- ed to the size of joint inclination,and the effect of joint density on the unified modulus shows a "V"shape,namely,the unified elastic modulus first decreases and then increases with the increase of joint density.With the increase of joint inclination,the unified elastic modulus increases gradually and its maximum value,which achieves 70%-80%of the complete specimens"elastic modulus,appears at 90 of joint inclination.The joint inclination is the major influencing factor on the unified peak strength and the unified elastic modu- lus of the rock-ike specimens containing many joints.Further analysis on the test results demonstrates that the transformation law of the relationship between the joint density or joint inclination and the stress-strain curve,as well as the unified peak strength and the u- nified elastic modulus,is related to the failure process of the specimen.The failure mode of the specimen can be classified into three 收稿日期：2016-07-04 基金项目：国家自然科学基金资助项目(10972238)：中南大学顾士生自主探索创新项目(2016zzs448)工程科学学报，第 39 卷，第 4 期: 494--501，2017 年 4 月 Chinese Journal of Engineering，Vol． 39，No． 4: 494--501，April 2017 DOI: 10． 13374 /j． issn2095--9389． 2017． 04． 003; http: / /journals． ustb． edu． cn 单压下节理密度及倾角对类岩石试件强度及变形的 影响 王佩新1) ，曹 平1) ，蒲成志2) ，范 祥3) ，陈 瑜1) ，王聪聪1) 1) 中南大学资源与安全工程学院，长沙 410083 2) 南华大学核资源工程学院，衡阳 421001 3) 长安大学公路学院，西安 710064 通信作者，E-mail: pcao_csu@ sina． com 摘 要 通过预制张开节理类岩石试件，在单轴压缩条件下，研究节理密度及倾角的组合作用对试件强度和变形特征的影 响． 试验结果表明: ( 1) 随着节理倾角的增大，应力--应变曲线由多峰值转变为单峰值，试件脆性增强，延性减弱; ( 2) 节理密 度对当量峰值强度的影响与节理倾角大小有关，对当量弹模的影响呈“V”形变化，即当量弹模随着节理密度的增大呈现先减 小后增大的变化规律; ( 3) 当量弹模随节理倾角的增大而增大，在节理倾角为 90°的时候达到最大值，为完整试件弹性模量的 70% ～ 80% ; ( 4) 节理倾角对多节理类岩石试件当量峰值强度和当量弹性模量的影响大于节理密度的影响． 对试验结果进一 步分析发现: 节理密度及节理倾角与应力--应变曲线、当量峰值强度及当量弹性模量之间的关系，其变化规律与试件的破坏过 程息息相关，其破坏模式可分为张拉破坏、剪切破坏和复合破坏． 关键词 类岩石试件; 岩石节理; 倾角; 密度; 单轴压缩; 峰值强度; 弹性模量; 破坏模式 分类号 TU452 收稿日期: 2016--07--04 基金项目: 国家自然科学基金资助项目( 10972238) ; 中南大学硕士生自主探索创新项目( 2016zzts448) Effect of the density and inclination of joints on the strength and deformation properties of rock-like specimens under uniaxial compression WANG Pei-xin1) ，CAO Ping1)  ，PU Cheng-zhi2) ，FAN Xiang3) ，CHEN Yu1) ，WANG Cong-cong1) 1) School of Ｒesources and Safety Engineering，University of Central South，Changsha 410083，China 2) School of Nuclear Ｒesources Engineering，University of South China，Hengyang 421001，China 3) School of Highway，University of Chang'an，Xi'an 710064，China Corresponding author，E-mail: pcao_csu@ sina． com ABSTＲACT The effects of the combination of joint density and inclination on the strength and deformation characteristics of rock￾like specimens containing open joints were studied by using uniaxial compression tests． The following conclusions were made: with the increase of joint inclination，the stress--strain curve changes from a multi-peak value to a single peak value and the brittleness of the specimen enhances，whereas the ductility of the specimen weakens． The influence of joint density on the unified peak strength is relat￾ed to the size of joint inclination，and the effect of joint density on the unified modulus shows a“V”shape，namely，the unified elastic modulus first decreases and then increases with the increase of joint density． With the increase of joint inclination，the unified elastic modulus increases gradually and its maximum value，which achieves 70% － 80% of the complete specimens' elastic modulus，appears at 90° of joint inclination． The joint inclination is the major influencing factor on the unified peak strength and the unified elastic modu￾lus of the rock-like specimens containing many joints． Further analysis on the test results demonstrates that the transformation law of the relationship between the joint density or joint inclination and the stress--strain curve，as well as the unified peak strength and the u￾nified elastic modulus，is related to the failure process of the specimen． The failure mode of the specimen can be classified into three