Preliminary　location　of　microcracks　in　several　rock　specimens　under　true　triaxial　compression  

作　　者：许昭永 梅世蓉 庄灿涛 杨洪沧 包一峰 

出　　处：《Earthquake Science》1994年第S1期51-59,共9页地震学报（英文版）

摘　　要：Yingjiang granite, Hudiequan plagioclase-granite and Longling granite specimens were true-triaxially compressed (σ1>σ2>σ3) till they ruptured. The 8-channel, high-speed microcrack data sampling and analyzing system were used to preliminarily analyze the temporal and spatial distribution of the microcracks during the rupture-brewing process. Result of our study showed the following: In the primary episode(peak value) of the acoustic emission (AE), many microcracks were developed. In the second episode (relatively stable and of lower value), fewer microcracks were developed. The microcracks developed in the aformentioned 2 episodes all randomly distributed throughout the entire specimens. When stress kept increasing and reached the third episode (the 2nd peak value), the number of microcracks increased again and gradually gaps were formed. The stripe-shaped distribution was only observed in the short period immediately before the main rupturing.Yingjiang granite, Hudiequan plagioclase-granite and Longling granite specimens were true-triaxially compressed (σ1>σ2>σ3) till they ruptured. The 8-channel, high-speed microcrack data sampling and analyzing system were used to preliminarily analyze the temporal and spatial distribution of the microcracks during the rupture-brewing process. Result of our study showed the following: In the primary episode(peak value) of the acoustic emission (AE), many microcracks were developed. In the second episode (relatively stable and of lower value), fewer microcracks were developed. The microcracks developed in the aformentioned 2 episodes all randomly distributed throughout the entire specimens. When stress kept increasing and reached the third episode (the 2nd peak value), the number of microcracks increased again and gradually gaps were formed. The stripe-shaped distribution was only observed in the short period immediately before the main rupturing.

关 键 词：microcrack location temporal and spatial distribution gap STRIPE 

分 类 号：P313[天文地球—固体地球物理学]