Mechanical properties of rocks under dynamic loading

动载下岩石的力学特性

• 批准号: 62460184
• 负责人: OKUBO Seisuke
• 金额: $ 2.56万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-62460184/
• 关键词: Rock; Uniaxial Compressive Strength; Dynamic Loading; 時間依存性; 衝撃圧縮試験; 衝撃; 圧縮強度

Mechanical behaviour of rocks under the dynamic loading was investigated in this study, where time up to strength failure point is about 1 ms. Here, the dynamic loading means not impact loading, but high speed loading.Computer program to simulate dynamic loading tests is developed and simulation were carried out under various conditions to find an appropriate testing method. The results of computer simulation indicate that the dynamic properties can be obtained by a simple method ; impact the rock specimen by a hammer and measure the output of loadcell placed under the rock specimen.Experiments were carried out and results are summarized as follows.1) Uniaxial compressive strength of Kawazu tuff is about 32MPa, while compressive strength under dynamic loading is about 64 MPa.2) Uniaxial compressive strength of Tako sandstone is about 32MPa, while compressive strength under dynamic loading is about 63MPa.3) The ratio of dynamic and static compressive strength is found to be two for Kawazu tuff and Tako sandstone. this ratio is very close to the results of previous works by more complicated methods.4) The test can be carried out easily and speedy and it is possible to carry out in-situ.

本文研究了岩石在动态载荷作用下的力学行为，其中达到强度破坏点的时间约为1 ms。这里的动态载荷不是指冲击载荷，而是指高速载荷。本文开发了计算机程序来模拟动态载荷试验，并在各种条件下进行了模拟，以找到合适的试验方法。计算机仿真结果表明，该方法简单易行，可以得到系统的动态特性;通过对川津凝灰岩的单轴抗压强度试验，得到了如下结果：1）川津凝灰岩的单轴抗压强度约为32 MPa，动态抗压强度约为64 MPa。2）Tako砂岩的单轴抗压强度约为32 MPa，动压强度约为63 MPa。3）河津凝灰岩和Tako砂岩的动静压强度之比为2。这一比值与以前用更复杂的方法所得到的结果非常接近。4）试验可以容易和快速地进行，并且可以在现场进行。