红河断裂带断层泥基本力学性质的初步研究

本文对红河断裂带断层泥的某些基本力学性质进行了实验研究,得到红河断层泥的体积压缩模量为104巴的量级,杨氏模量为102—103巴的量级,泊松比为0.3—0.4,单轴抗压强度由数巴至数十巴,单轴抗剪强度为数巴,粘滞系数为1010—1011泊的量级,弹性波速为1.5—2.2公里/秒。对比红河断裂带南北两段断层泥的力学性质,看出南段断层泥的体积压缩模量,杨氏模量、抗压强度、粘滞系数和弹性波速比北段断层泥高。此外,南段断层泥弹性波速基本上各向同性而北段断层泥弹性波速显示出各向异性。 

PRELIMINARY STUDY ON ELEMENTAL MECHANICAL PROPERTIES OF GOUGE OF THE RED RIVER FAULT

The elemental mechanical properties of samples of gouge from the Red River fault were studied experimentally. For the gouge of the Red River fault it was found that the bulk modulus is about 104 bars; the Young's modulus is from 102 to 103 bars; the Poisson's ratio is from 0.3 to 0.4; the compressive strength is from several bars to several tens of bars; the shear strength is several bars; the viscosity coefficient is from 1010 to 1011 Poise and the wave velocity is from 1.5 to 2.2 km/s. Comparing the mechanical properties of the gouge from the north part with that from the south part of the Red River fault, the bulk modulus, Young's modulus, the compressive strength, the viscosity coefficient and the wave velocity of the south part are higher than those of the north part. Farther, in the south part of the fault the wave velocity is isotropic, but in the north part of the fault the wave velocity seems to be anisotropic.