BQ法边坡工程岩体质量指标计算的修正系数研究

《工程岩体分级标准》(GB/T 50218—2014)(简称《国标》)中给出了边坡工程岩体质量指标BQ](简称边坡BQ])的计算公式以及计算公式中修正系数的取值方法,用于国内边坡工程岩体质量分级和边坡自稳能力评估。通过对边坡BQ]计算公式的研究,并参考其他常用的边坡工程岩体分级方法,指出了边坡BQ]计算公式中的修正项和修正系数评价指标存在改进和完善的空间。在现有的边坡BQ]计算公式的基础上,补充了坡高影响修正系数和应力状态影响修正系数以及相应的计算公式和取值标准,在结构面性状影响修正上细化了评价指标和相应的取值标准,使其更适用于复杂地质条件下的高陡边坡岩体分级,并给出了优化后的边坡BQ]计算公式以及相应的BQ法边坡稳定性评价系统。研究成果有助于准确地进行边坡工程岩体质量分级,从而为评价边坡稳定性、设计加固方案提供参考依据。

Correction Factor in Calculating Rock Mass Quality Index by BQ Method in Slope Engineering

The calculation formula of rock quality index in slope engineering (hereafter referred to as BQ (basic quality)),together with the valuing of correction factor in the formula, is given in Standard of Engineering Rock Mass Classification(GB/T 50218-2014) for the rock quality rating and self-stability evaluation of slope engineering in China. With other commonly used rating methods as reference, we pointed out that the evaluation index of cor-rection term and correction factor in the BQ formula needs to be improved. On the basis of the current BQ formula, we propose the correction factor of slope height influence and the correction factor of stress state influence,and give the corresponding calculation formulas and valuing criteria.We also refined the evaluation indexes and valuing crite-rion of the correction factor of structural plane influence for high and steep slope in complex geological conditions. Finally,we give the optimized BQ formula and the corresponding stability evaluation system for BQ method. The re-search results are conducive for a correct rock quality rating, and offer reference for slope stability evaluation and reinforcement design work.