深部岩体工程围岩质量评价的IRMR法研究

IRMR method for evaluation of surrounding rock quality in deep rock mass engineering

通过采用连续性细化方法,考虑高压地下水和高地温对岩体力学性质的影响,分别引入地下水和地温弱化系数,对传统RMR法中的岩石单轴抗压强度、岩石质量指标和节理间距这3个评价指标的评分标准进行修正,获得3个评价指标和其对应分值之间的非线性连续回归方程;根据深部岩体工程中地应力与岩石强度特征值之间的关系,定义岩体损伤破坏危险度系数,且建立该系数和岩体质量评分修正值之间的对应关系,由此获得适用于深部岩体工程围岩质量评价实际的IRMR法,并用实例验证了该法评价结果的合理性和有效性。

The marking standards of 3 indexes of rock uniaxial compressive strength, rock quality designation and joint space in the traditional RMR method were revised by the continuation refinement method combining the groundwater and ground temperature weakening factors, which were defined by considering the effect of the underwater of high pressure and high earth temperature on the rock mass mechanics characteristics. A nonlinear continuous regressive equation between the values of 3 indexes and their marking values were gained. Then, the rock mass damage risk degree factor was also defined by considering the comparative relation between the crustal stress value and a rock strength characteristic value. A corresponding relation table between the factor values and the revised marking values of rock mass quality were also built. Therefore, an improved comprehensive RMR method was gained, which was appropriate for the evaluation of the surrounding rock quality in deep rock mass engineering. The result shows that the revision method is reasonable and efficient.