基于广义RQDt的岩石质量空间分布规律研究

自然界中的岩石通常含有大量复杂交错的结构面,造成岩石质量在三维空间中存在明显的各向异性。作为评价岩石质量的重要参数,岩石质量指标(广义RQDt)被广泛应用于岩体工程。结合三维裂隙网络模拟法和测线法,对岩体质量在三维空间不同方向上的分布规律进行研究:首先根据研究域岩体的裂隙统计参数及分布规律,利用Monte-Carlo法生成三维随机裂隙网络;然后通过在研究域内布置监测点和测线的方式来计算监测点处RQDt值随空间方位的变化,得到岩石质量空间分布图,以此来直观描述岩体质量沿空间不同方向的分布。将该法应用于某工程坝区岩体质量评估,表明该方法简单且具有较强的实用价值,可较全面描述岩体质量在空间方向上的分布规律。

STUDY OF SPATIAL DISTRIBUTING OF ROCK MASS QUALITY USING GENERALIZED RQDt

The rock masses in nature usually contain a large number of discontinuities, which results in the anisotropy of rock masses. As one of the important parameters to evaluate rock quality, the generalized RQDt is widely used in rock masses engineering.3D stochastic discrete fracture network method and scan line method are combined to study the spatial distribution regularity of rock quality in different directions. The suggested method is used to study the spatial distribution regularity of dam foundation. Specific steps are as follows:Firstly, based on the probability distribution functions and corresponding statistical parameters investigated in field, 3D stochastic discrete fracture networks are randomly generated using the Monte Carlo Method. Secondly, lots of generalized RQDt can be calculated by setting measuring points and measuring lines. Thirdly, the spatial distribution regularity of rock quality in different directions can be described according to the spatial distribution map. The results indicate that the proposed method is valid and useful for describing the spatial distribution regularity of rock mass quality.