DYNAMIC AND STATIC MODULI
DYNAMIC AND STATIC MODULI
复制标题
DOI：
10.1029/gl008i001p00039
复制
发表时间：
1981-01-01
影响因子：
5.2
通讯作者：
JOHNSTON, DH
中科院分区：
文献类型：
--
作者：
CHENG, CH;JOHNSTON, DH
静态和动态体积模量（Ksand Kd）作为压力从0到2‐3千巴的连续函数测量，适用于凝灰岩、石灰岩、花岗岩和油页岩两种砂岩。砂岩和花岗岩的结果与先前报道的数据一致，Ks/ k0在大气压下约为0.5，在2千巴及以上的压力下接近于1。对于静载荷下表现为弹性的岩石，Ks/ kratio与微裂纹密度成反比。对于石灰岩，与孔隙塌陷相关的时间依赖性变形导致高压下的Ks/ kratio接近0.1。卸载后，虽然在高压下初始值很高（~ 1.0），但由于孔隙坍塌过程中产生的微裂纹的打开，Ks/ kd变得低于在低压加载（< 1千巴）时获得的值。对于微裂缝较少的油页岩，Ks/ kd相对稳定，压力约为0.7。
Static and dynamic bulk moduli (Ksand Kd) are measured as continuous functions of pressure from zero to 2‐3 kilobars for two sandstones, a tuff, limestone, granite, and oil shale. Results for the sandstones and granite are in good agreement with previously reported data with Ks/Kdvarying from about 0.5 at atmospheric pressure to close to unity at pressures 2 kilobars and above. For rocks behaving elastically under static loading, the Ks/Kdratio is inversely related to the microcrack density. For the limestone, time dependent deformation associated with pore collapse results in Ks/Kdratios approaching 0.1 at high pressure. Upon unloading, while initially high ( ∼ 1.0) at high pressures, Ks/Kdbecomes lower than values obtained during loading at low pressures ( < 1 kilobar) due to opening of microcracks generated during pore collapse. For the oil shale, in which few microcracks exist, Ks/Kdremains relatively constant with pressure at a value of about 0.7.