磨料射流破碎岩石的性能研究.pdfVIP

2 1 V l. 2 2006 02 Chinese J urnal f Undergr und Space and Engineering Feb. 2006 : 1673-0836( 2006) 01-0170-05 磨料射流破碎岩石的性能研究 1, 2 2 2 2 向文英 , 李晓红, 卢义玉 , 梁 峰 ( 1. ; 2. , 400045) : 磨料射流在切割破碎岩石时, 将产生比纯水连续射流 大的冲击力从固液两相 流特点出发, 对高压磨料射流破碎岩石的机理进行了分析与实验研究得出岩石在受到磨料 射流的冲击下, 磨粒与水体对岩石的冲击压力与岩石在水介质作用下力学特性的变化共同促 使了岩石的破坏岩石破坏时最大剪应力位于0. 5 倍喷嘴直径的径向距离处, 同时在固体介 质表面边缘产生最大拉应力该研究从理论与实验上为磨料射流破碎岩石奠定了理论基础 : 磨料射流; 破碎; 冲击压力; 最大剪应力 : TU443 :A The Research of the Characteristic of Rock Broken by Abrasive Water Jet 1, 2 2 2 2 XIANG Wen-ying , LI Xia-H ng , LU Y-i Yu , LIANG Feng ( 1. College of Urban Construction and Environmental Engineering, Chongqing University, Chonqing 400045, China; 2. College of Resource and Environmental Science, Chongqing University, Chongqing 400045, China) Abstract: It will bring larger wall p with abrasivewater jet than with pure water jet t incise and break r ck. . In this paper the mechanism f r ck br ken with abrasive water jet under high pressure is analysed and experimented acc rding t characteristic f s lid and fluid stream. It has been sh wn that the impact pressure and changing f mechanical characteristic f r ck t gether make it br ken by abrasive water jet. The maximum cutting stress lie f the radial distance f 0. 5 d uble di- ameter n zzle, while the maximum pull stress lie in the surface edge f the r ck. The the retical and experimental w rks have established the f undati n f abrasive waterjet incising and breaking r ck. Keywords: abrasive water jet; incise and break; impact pressure; the maximum cutting