动载下石英微观形变研究及其应用

Shock-controlled experiments on samples from two types of granites were carried out by use of a series of high explosive lenses differing in peak pressures. Microdeformation features (e.g., micro-eracks, shock lamellae and changes of refractive index(No) in ordinary light) were observed, under the petrographic microscope for quartz selected from the shocked granite samples. According to our observation, we have related the micro-deformation of quartz with peak pressures. Similar study of micro-deformation of quartz was also performed from the granite medium in which underground nuclear explosion was carried out. By comparing the deformation features of quartz subjected, to the shock caused by nuclear explosion with those mentioned above we deduced the stress distribution in the free-field in the underground nuclear explosion medium. Based upon the above results, together with some other data, damaged zones in the free-field in respect to this underground nuclear explosion can be distinguished in terms of microscopic features.