结构面三维网络模拟在岩体质量评价中的应用

Application of 3D network modeling rock mass discontinuities to evaluating rock mass quality for dam foundation

岩石质量指标RQD是反映工程岩体完整程度的定量参数,广泛用于水利水电、矿山、地下工程、交通工程等岩体稳定性评价,但是传统的RQD定义不能满足实际工程岩体各相异性要求。针对贵州黔中水利枢纽工程拱坝坝基岩体结构面特征,利用Monte-Carlo法在计算机上生成岩体节理三维网络图,建立了模拟计算不同阀值t的岩石质量指标RQDt的计算机模拟方法。该方法能较真实客观地描述岩石质量。

Rock quality designation （RQD） is a quantitative parameter that used to reflect the degree of integrality of engineering rock mass. And it has been applied to assess the stability of rock slope in the field of water resources and hydropower engineering, mining, underground engineering, transportation engineering. However, the traditional RQD definition isn＇t able to take into account the anisotropy of the engineering rock mass. Aiming at the structural properties of the arch dam of Qianzhong Hydraulic Project in Guizhou Province, and based on the joint network of rock mass simulated by the computer with Monte-Carlo method, a method of deciding RQDt under different threshold values is proposed. Many engineering practices have validated that this method is able to reflect the engineering rock mass quality objectively.