某工程中岩石成分与其力学性质关系浅析

Analysis of the Relationship Between Mineral Composition and Mechanical Properties of Rocks Based on A Project

地层岩芯是为各类地基基础和地下空间工程提供施工参数的重要数据来源,但往往由于地层条件复杂、取芯费用较高等客观因素的存在,使得实验用岩芯的数量越来越有限。因此本文期望根据岩石成份与其力学性质之间的相互关系,为岩石力学性质参数的获取提供一种可行的替代方法。文中对某工程中超前钻取得的岩石样本进行岩石力学性质测试,得到岩石样品的抗压强度、泊松比和弹性模量;并采用X射线衍射方法测定岩石样品的矿物成分种类和含量。通过相关分析和主成分分析的方法获得了岩石成分与力学性质的关系;因子分析表明,岩石的矿物成分对岩石力学性质的影响可以用3个指标来衡量,石英、钾长石和粘土矿物的含量分别在3个指标中占有较大的权重。

The cores usually provide a most significant source of parameters for oil field development. However, some stratum has complicated condition and the cost for drilling cores is very high, so the quantity of cores is more and more limited. This article is expected to provide a feasible substitute method for rock mechanics characters gain- ing, according to the relationship between mineral composition and mechanical properties of rock. The mechanical properties, including compression strength, Poisson＇s ratio and elasticity modulus, are measured by experiments in Mechanics. The samples are also tested by X-ray diffraction method to determine the kind and contents of mineral contained in the rock. The relationship between mineral composition and mechanical properties are obtained by ana- lyzing the experimental data using methods of relation analysis and principal component analysis. Factorial analysis＇ s result shows that the relationship between mineral composition and mechanical properties can be measured by three factors, in which plagioclase, clay mineral and siderite have a high weighting.