不同温度的水岩作用对岩石节理表面形貌特征的影响  

Influence of water-rock interaction on morphological characteristic of rock joint surface at different temperatures

作　　者：曹平[1] 宁果果[1] 范祥[1] 梅慧浩[1] 黄雪姣[1] 

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2013年第4期1510-1516,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51274249);高等学校博士学科点专项科研基金资助项目(20090162110037);中南大学研究生学位论文创新资助项目(2011ssxt271);中南大学米塔尔学生创新项目(11MX22)

摘　　要：选取2种不同岩石试样,利用微机超级恒温槽控制不同温度的水岩作用,并采用Talysurf CLI2000三维表面激光形貌仪扫描岩石表面并分析其形貌特征参数,通过水岩作用前后形貌分形参数和数理统计参数定量对比,探讨不同温度水岩作用对岩石节理表面形貌变化影响机制。试验结果表明：在20~60℃范围内,经过水岩作用后岩石表面形貌分形维数的相对变化ΔD随着温度升高而增大,在60~80℃范围则随着温度升高而减少;相对分形维数变化ΔD和水岩作用温度t二者之间的呈现抛物线函数特征;温度对形貌数理统计参数的影响规律表明：温度的升高可以促进水岩作用,并且存在一个温度敏感极值点tms（本研究为60~80℃之间）,此时温度对水岩作用影响程度达到最大。当温度低于敏感极值点时,温度的升高可以加速促进水岩作用,而高于敏感极值点时,水岩作用对温度的敏感性明显降低。Two kinds of rock were chosen to be tested and scanned by the three dimensional topography measurement instrument of Talysurf CLI 2000 under the influence of different temperatures which were controlled by the Super Thermostatic Bath. The fractal parameters and mathematical statistical parameters of scanned data before and after the water-rock interaction were obtained. The comparative analysis of these available parameters at different temperatures indicates that different temperatures result in different variations in morphology characteristics parameters. When the temperatures are ranging from 20 to 60 ℃, the fractal dimensions rise along with the increase of temperature. While in the range of 60-80 ℃, the fractal dimensions fall as the temperature rises, and the relative fractal dimensional variations AD are parabolic functions with the increase of the temperatures. A threshold value is proposed to judge the effect of temperatures on the rock-water interaction （in this work the threshold value is fixed in the range of 60-80 ℃）. When the temperature value is inferior to the threshold value, the temperature rise can accelerate the interaction between water and rock. On the contrary, when the temperature value exceeds the threshold value, the interaction susceptibility to temperature decreases evidently.

关 键 词：水岩作用 温度耦合 表面形貌 分形参数 统计参数 

分 类 号：TU458[建筑科学—岩土工程]