岩石超高压状态参数的实验研究

THE EXPERIMENTAL STUDY OF PARAMETERS OF ROCKS UNDER ULTRAHIGH-PRESSURE STATE

岩石的超高压状态参数对研究地球动力学问题和岩石爆破工程问题具有十分重要的意义.本实验应用平面波炸药透镜驱动飞板撞击靶板产生超高压冲击波,并用探针测量冲击波在岩石试件中的传播速度和粒子速度,再由 Rankine-Hugoniot 方程得到岩石的密度与压力之间的关系.所研究的岩石为石灰岩和花岗岩.实验的最高压力超过70GPa.得到两种岩石的超高压状态方程是:石灰岩——ρ=3.22+0.016_p;花岗岩——ρ=3.20+0.024_p.其中ρ的单位为 g/cm^3,p 的单位为 GPa.

The parameters of rocks under ultrahigh-pressure state are very important to problems of geodynamics and explosion engineering. In these experiments, plane wave dynamite lenses were used to drive the flying plates. The flying plate hits the target and produces an ultrahigh-pressure shock wave. The propagation velocity and the particle velocity of shock wave in rock samples ware measured by probes, and the relation between density of rocks and pressure was obtained by the Rankine-Hugonito formula. Samples of limestone and granite were studied. The maximum pressure attained in experiments was highet than 70 GPa. The ultrahigh-pressure state formulas obtained are: Limestone: p = 3.22 + 0.016 p; Granite: p = 3.20+ 0.024 p; where the unit for p is g/cm3, the unit for p is GPa.