NEW TFXHNOLOGIES OF ROCK-LIKE MATERIAL DIRECT TENSILEEXPERIMENT AMD ITS APPLICATION
Due to the limitations of experimental equipments and technologies, direct tensile experiment of rock-like material has been deemed as one of the difficult laboratory tests to implement. After analyzing the advantages and disadvantages of several main methods for direct tensile experiment, some improvements are given for the conventional bonding method and fixture method. A location device for rock-like material bonding tensile experiment and a sample mold and its matching clamp for fixture tensile experiment are designed firstly. By using the improved equipments and technologies, accurate results can be obtained easily. Afterwards, uniaxial direct tensile experiments are earned out with rock-like mortar material, and tensile stress-strain curves are obtained. The results indicate that the force and deformation process in tensile condition of rock-like material is quite different from that of compressive condition. Tensile force and deformation process can be divided into four stages: flaws opening stage, elastic deformation stage, elastic and plastic deformation stage, and failure stage. The elastic deformation stage takes up the most proportion, wherein elastic strain proportion occupies about 2/3 of the total strain. After very little plastic deformation, the stress reaches the peak strength, when burst-like fracture forms in the sample and residual stress drops to zero suddenly.
LEI YANG SHU-CAI LI MING-TIAN LI NING ZHANG
Geotechnical and Structural Engineering Research Center, Shandong University Jinan, 250061, P.R.China
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
131-136
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）