|
Abstract Based on the problem of the quantitative description of blasting well breakdown pressure，19 experiments on rock cracking with three kinds of tensile strengths under 5 loading rates are carried out by the rock dynamic cracking simulation device. The experiments verify that the device can simulate the reservoir conditions of a center open hole with the boundary conditions of constent pressure while giving a test of rock fragmentation by water pressure impact on the small simulation hole immediately. It can offer the loading rate bellow 153.17 MPa/ms，which can simulate the real blasting fracturing condition completely. The regression analysis of experimental data shows that the difference of dynamic and static breakdown pressures with the loading rate shows a very good logarithm relationship，and the regression model presents a calculation error of 0.95%. The research results can help to ascertain minimum peak pressure in the design of detonation pressure and enhance the production of universal application and the success rate.
|
|
Received: 06 July 2008
|
|
|
|
