高温后闪长岩部分物理性质实验研究

Experimental study on partial physical properties of post-high-temperature diorite

地热开发及高放核废料深层地下处置等高温岩石工程均涉及高温环境下的岩石尤其是岩浆岩的物理力学性质问题。以闪长岩为研究对象,通过测量岩样热处理前后的物理指标,得出了温度对闪长岩物性的影响关系。研究表明:1600℃为温度对闪长岩物性影响的阈值;2800℃时岩石结构开始破坏,1000℃时结构构造完全被破坏;3高温对闪长岩结构构造的破坏主要表现在大部分矿物热破裂、石英边界变得模糊、长石发生蚀变;4密度与纵波波速均随温度增加而降低。

The findings of the relationship between different high temperatures and the related physical properties are in general needed to be classified in the development of high-temperature geothermal resources and the disposal of nuclear waste especially on magmatic rock. The experimental tests on diorite specimens are carried out by measuring the physical properties before and after the high-temperature treatment, then how the temperature affects the physical properties of diorite is analyzed. The observed results indicate that： （1） The temperature threshold value of the impact of diorite physical properties is 600℃; （2） The rock structures begin to be destroyed at 800℃, and are completely destroyed at 1000℃; （3） The high temperature damage to the diorite structure is mainly represented by the following three behaviors： thermal rupture of most of the mineral, blurred quartz boundaries, and feldspar alteration; （4） The density and vertical waves decrease with the increasing temperature.