摘要
以白鹤岭铁路隧道岩体边坡为例,在垂直边坡面的4条剖面上采集了不同变形和破坏状态岩石中的16个定向样品,测定了流体包裹体迹面(Fluid Inclusion Plane 简称为 FIP)特征参数(包括 FIP 的长度、形态、连通性、闭合性、粗糙度、交叉性质等参数)与包裹体热动力学参数(包括 FIP 中包裹体的均一温度、均一压力、包裹体流体密度、流体包裹体成分和氧逸度等参数)。同时,将样品中裂隙分布的分形维数作为描述岩石变形破坏状态的定量指标,采用反馈式逐步回归方法分析这些分形维数与所选7个 FIP 参数的定量关系。分析表明,影响岩体变形和破裂的主要微观参数包括两个 FIP 特征参数(即粗糙度系数和分布密度)和两个包裹体热力学参数(即水溶液包裹体均一温度和 CO_2-H_2O 包裹体均一温度)。由于岩体的变形和(或)破坏不仅可使 FIP 中包裹体成分泄漏、也会使 FIP 迹面特征参数和包裹体热动力学参数发生改变,因此,岩体边坡中流体包裹体参数的逐步回归分析结果对进一步研究岩体变形破坏过程与边坡稳定性将具有重要的参考价值。
The rock slope, located near a railway tunnel in Baiheling Mountain, Zhejiang Province, China, was taken as an example to select four sections perpendicular to the slide surfaces, to collect 16 oriented samples with different deformations/failures and then to measure seven parameters of fluid inclusion planes （FIP）. These FIP parameters consist of characteristic parameters of the planes and thermodynamic parameters of the inclusions in the planes. The former parameters include the lengths, configurations, connections, closings, roughness and intersection of FIP. The latter parameters include the homogenization temperatures, homogenization pressures, fluid densities, fluid compositions and fluid oxygen fugacity. The fractal dimensions of micro-crack distributions were used as a quantitative index to demonstrate the deformations/fractures of the rocks around FIP. A stepwise regression method was used to analyze the quantitative relationship between the fractal dimensions and those seven FIP parameters. It was found that two characteristic parameters （i. e. , roughness coefficient and distribution density ） of FIP and two thermodynamic parameters （i. e. , the homogenization temperatures respectively of water solutions and CO2-H2O solutions） of the fluid inclusions were main variables to affect the rock landslide in the microscopic sense. Because the deformations or failures in rock slopes may not only lead the leakage of fluid inclusions in FIP but also change the characteristic parameters of FIP and the thermodynamic parameters of fluid inclusions, the results from the stepwise regression analysis to FIP parameters may be an important reference to further study the deformation/failure procedures and stability mechanism for rocks or for rock slopes.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第9期2059-2062,共4页
Acta Petrologica Sinica
基金
国家自然科学基金(40572162)
关键词
岩体边坡
裂隙分布分维数
FIP参数
逐步回归分析
Rock slope, Fractal dimension of crack distributions, Parameters of fluid inclusion planes, Regression analysis
