基于CRITIC-CW法的地下矿岩体质量评价

岩体质量评价结果是地下矿各类工程的重要基础数据。针对影响岩体质量的因素众多,且各因素间模糊性显著的特点,为更准确地评价地下矿岩体质量,提出了一种可定量分析影响岩体质量各因素间模糊性的CRITIC-CW法。选取了岩石质量指标RQD、岩石单轴饱和抗压强度RW、岩体完整性系数Kv、结构面强度系数Kf和地下水渗水量ω共5个指标用于评价地下矿岩体质量。收集了国内外20组岩体质量评价的样本数据,采用CRITIC法计算样本数据的离散性和内在联系,获得了评价指标的权重。采用CRITIC-CW法对20组岩体质量评价样本进行评价,结果误判仅为一例,表明CRITIC-CW法具有较高的准确性和可靠性。采用CRITIC-CW法对三山岛金矿新立矿区部分采场的岩体质量进行评价,结果表明:所评价采场的岩体质量主要为Ⅲ级和Ⅳ级,岩体质量较差,依据岩体质量评价结果,对评价等级为Ⅳ级的采场及周边工程加强支护后,矿区冒落现象显著减少。

Rock Mass Quality Evaluation of Underground Mine Based on CRITIC-CW Method

The rock mass of underground mine is a very complex dynamic system,which has many influencing factors. The rock mass quality evaluation is not only an important means to understand the characteristics of underground mine rock mass,but also an important basic data of underground mine design,construction and disaster prevention. The fuzzy and uncertainty of rock mass quality evaluation are strong. Cloud model theory can analyze the fuzzy and quantitative problems,which is very suitable for the random and fuzzy evaluation of multi indexes of rock mass quality evaluation. In order to evaluate the rock mass quality of underground mine more accurately and efficiently,the CRITIC-CW method was proposed,which can quantitatively analyze the fuzziness among many factors affecting the rock mass quality. According to the characteristics of many influencing factors of rock mass quality,rock quality index(RQD),rock uniaxial saturated compressive strength(RW),rock mass integrity coefficient(Kv),structural plane strength coefficient(Kf)and groundwater seepage amount(ω)were selected to evaluate the quality of underground mine and rock mass. 20 groups of sample data of rock mass quality evaluation at home and abroad were collected. The original data were standardized,the standard deviation,the correlation coefficient and the amount of information were calculated by using critical method to quantify the discreteness and internal relationship of sample data,and then the weight of each evaluation index was obtained. Based on the CRITIC-CW method,20 groups of rock mass quality evaluation samples were evaluated,and only one case is misjudged,which shows that the CRITIC-CW method has high accuracy and reliability.Xinli mining area of Sanshandao gold mine is the only gold mine under the sea in China.The geological conditions of the mining area and the quality of surrounding rock are complex.In the production process,local pumice falling,roof falling,collapse and other disasters often occur due to blasting vibration,mechanical drilling and other activities,that seriously threatening the safety of mine production.In order to understand the rock mass quality of the mining area better,the CRITIC-CW method was used to evaluate the rock mass quality of some stopes in Xinli mining area of Sanshandao gold mine.The results show that the rock mass quality of the evaluated stopes is mainly class Ⅲ and class Ⅳ,and the rock mass quality is general. According to the results of the rock mass quality evaluation,after strengthening the support for the stopes and surrounding works with the evaluation class Ⅳ,the caving phenomenon of the mining area is obvious decrease.