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利用Nishiyama和Kusuda(1994)提出的荧光方法,对Westerly花岗岩试样单轴压缩破坏瞬时微裂纹进行详细的实验观察。应用这种方法,能同时有效、容易地确认微裂纹的产生方式,如长石颗粒间的解理裂纹、石英颗粒间的晶内裂纹和这些裂纹的宽区域分布。作为一个观察结果,确认拉长的相连裂纹对花岗岩破坏有直接影响,这些裂纹大致分为3类。据推测,这3类裂纹不能同时发展,每一类有不同的产生机制。单轴压缩下裂纹的产生机制是:首先,在平行于施加荷载方向产生许多微裂纹,长裂纹是通过延长和合并微裂纹诱发产生的;然后,通过进一步加载,产生断层面,各部分的裂纹被连接、扩展;最后,花岗岩试样发生破坏。
Using the fluorescence method proposed by Nishiyama and Kusuda (1994), a detailed experimental observation on the instantaneous microcrack destruction of Westerly granite samples under uniaxial compression was carried out. With this method, the generation of microcracks such as cleavage cracks between feldspar grains, intragranular cracks between quartz grains, and wide-area distribution of these cracks can be confirmed efficiently and easily at the same time. As a result of the observation, it was confirmed that the elongated connected cracks had a direct effect on the granite failure, and the cracks were roughly classified into three categories. It is speculated that these three types of cracks can not be developed at the same time, each with different production mechanisms. The mechanism of uniaxial compression cracking is as follows: firstly, many micro-cracks are generated in the direction parallel to the applied load, and the long-crack is induced by lengthening and combining microcracks; then, by further loading, the fault surface and the cracks Was connected, expanded; finally, the granite sample was damaged.