工程科学学报，第39卷，第9期：1295-1304,2017年9月 Chinese Journal of Engineering,Vol.39,No.9:1295-1304,September 2017 D0l:10.13374/j.issn2095-9389.2017.09.001:htp:/journals..usth.edu.cn 考虑岩石交界面方向效应的巴西劈裂试验研究 李夕兵，罗琳四，黎崇金 中南大学资源与安全工程学院，长沙410083 ☒通信作者，E-mail:csulinluol991@csu.edu.cm 摘要为了研究硬岩与软岩交界面方向对其破坏形式的影响，对含岩石-水泥砂浆（代替软岩）交界面的组合试样进行了 多组加载角度的巴西劈裂试验，获得了不同交界面方向的组合试样的“抗拉”强度，并利用颗粒流程序P℉C2”研究了交界面的 破坏机理.计算得到的“抗拉”强度随交界面与加载方向夹角的增大而增大.当交界面平行于加载方向时，沿交界面发生劈 裂破坏，计算得到的“抗拉”强度可认为是交界面的抗拉强度：当交界面与加载方向不平行时，发生更为复杂的拉一剪复合破 坏.此外，为了进一步分析交界面的抗拉强度对破坏形式的影响，采用提高水泥用量和增大交界面粗糙度两种方法增加交界 面的抗拉强度，并进行了一系列试验.试验得到了含交界面的巴西劈裂试验的典型破坏模式分布图，对更好地理解硬岩与软 岩交界面的破坏形式具有指导意义， 关键词岩石力学；岩石交界面；巴西劈裂；断裂形式 分类号TU458 Experimental study of directivity effect of rock interface under Brazilian splitting LI Xi-bing,LUO Lin,LI Chong-jin School of Resources and Safety Engineering,Central South University,Changsha 410083,China Corresponding author,E-mail:esulinluol991@csu.edu.cn ABSTRACT A series of Brazilian split tests on rock-cement interface considering the effect of interface orientations were conducted to investigate the influence of hard rock-soft rock interface direction on failure behavior.The tensile strength for different interface orientations was obtained and failure mechanism of the interface was analyzed by the particle flow code PFC2.The measured tensile strength increases as the interface-loading angle increases.The measured tensile strength can be considered to be equivalent to that of the interface if the interface orientation is parallel to the loading direction,because tensile failures occur along the interface.Mixed- mode failures occur if the interface is not parallel to the loading line.In addition,another series of Brazilian tests were conducted to investigate the influence of the interface tensile strength on failures by increasing the cement dosage and roughening the rock surface. Based on the results,a diagram of the failure mode distribution marked with the typical failure patterns from the Brazilian test results for the rock-cement interface was developed.These findings provide a better understanding of the failure modes of the hard rock-soft rock interface. KEY WORDS rock mechanics;rock interface;Brazilian split;fracture modes 在开采矿石的过程中，人为的开挖扰动除了造成 失稳破坏得到了众多学者的关注.Yan等)利用 矿岩本身的破坏之外，还会对被开挖矿层所处位置的 SHPB装置开展了动态巴西劈裂试验，研究了凝灰岩 顶底板造成一定影响，进而造成矿石与围岩的整体失 与玄武岩交界面的动态拉伸特性.左建平等2-)采用 稳破坏.因此，近年来将矿岩作为组合体研究其整体 TS815对煤岩组合体进行了单轴和三轴压缩试验， 收稿日期：2016-11-17 基金项目：国家重点研发计划资助项目(2016Y℉C0600706):中南大学中央高校基本科研业务费专项基金资助项目(2017s166)工程科学学报,第 39 卷,第 9 期:1295鄄鄄1304,2017 年 9 月 Chinese Journal of Engineering, Vol. 39, No. 9: 1295鄄鄄1304, September 2017 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2017. 09. 001; http: / / journals. ustb. edu. cn 考虑岩石交界面方向效应的巴西劈裂试验研究 李夕兵, 罗 琳苣 , 黎崇金 中南大学资源与安全工程学院, 长沙 410083 苣通信作者, E鄄mail: csulinluo1991@ csu. edu. cn 摘 要 为了研究硬岩与软岩交界面方向对其破坏形式的影响,对含岩石鄄鄄水泥砂浆(代替软岩)交界面的组合试样进行了 多组加载角度的巴西劈裂试验,获得了不同交界面方向的组合试样的“抗拉冶强度,并利用颗粒流程序 PFC 2D研究了交界面的 破坏机理. 计算得到的“抗拉冶强度随交界面与加载方向夹角的增大而增大. 当交界面平行于加载方向时,沿交界面发生劈 裂破坏,计算得到的“抗拉冶强度可认为是交界面的抗拉强度;当交界面与加载方向不平行时,发生更为复杂的拉―剪复合破 坏. 此外,为了进一步分析交界面的抗拉强度对破坏形式的影响,采用提高水泥用量和增大交界面粗糙度两种方法增加交界 面的抗拉强度,并进行了一系列试验. 试验得到了含交界面的巴西劈裂试验的典型破坏模式分布图,对更好地理解硬岩与软 岩交界面的破坏形式具有指导意义. 关键词 岩石力学; 岩石交界面; 巴西劈裂; 断裂形式 分类号 TU458 Experimental study of directivity effect of rock interface under Brazilian splitting LI Xi鄄bing, LUO Lin 苣 , LI Chong鄄jin School of Resources and Safety Engineering, Central South University, Changsha 410083, China 苣Corresponding author, E鄄mail: csulinluo1991@ csu. edu. cn ABSTRACT A series of Brazilian split tests on rock鄄鄄cement interface considering the effect of interface orientations were conducted to investigate the influence of hard rock鄄鄄 soft rock interface direction on failure behavior. The tensile strength for different interface orientations was obtained and failure mechanism of the interface was analyzed by the particle flow code PFC 2D . The measured tensile strength increases as the interface鄄鄄loading angle increases. The measured tensile strength can be considered to be equivalent to that of the interface if the interface orientation is parallel to the loading direction, because tensile failures occur along the interface. Mixed鄄 mode failures occur if the interface is not parallel to the loading line. In addition, another series of Brazilian tests were conducted to investigate the influence of the interface tensile strength on failures by increasing the cement dosage and roughening the rock surface. Based on the results, a diagram of the failure mode distribution marked with the typical failure patterns from the Brazilian test results for the rock鄄鄄 cement interface was developed. These findings provide a better understanding of the failure modes of the hard rock鄄鄄soft rock interface. KEY WORDS rock mechanics; rock interface; Brazilian split; fracture modes 收稿日期: 2016鄄鄄11鄄鄄17 基金项目: 国家重点研发计划资助项目(2016YFC0600706);中南大学中央高校基本科研业务费专项基金资助项目(2017zzts166) 在开采矿石的过程中,人为的开挖扰动除了造成 矿岩本身的破坏之外,还会对被开挖矿层所处位置的 顶底板造成一定影响,进而造成矿石与围岩的整体失 稳破坏. 因此,近年来将矿岩作为组合体研究其整体 失稳 破 坏 得 到 了 众 多 学 者 的 关 注. Yan 等[1] 利 用 SHPB 装置开展了动态巴西劈裂试验,研究了凝灰岩 与玄武岩交界面的动态拉伸特性. 左建平等[2鄄鄄3] 采用 MTS 815 对煤岩组合体进行了单轴和三轴压缩试验