徐则双, 王明常, 王凤艳, 胡瀚, 孟祥羽, 赵明宇. 2018: 基于结构面迹线分形维数的岩体质量评价. 工程地质学报, 26(s1): 505-512. DOI: 10.13544/j.cnki.jeg.2018237
    引用本文: 徐则双, 王明常, 王凤艳, 胡瀚, 孟祥羽, 赵明宇. 2018: 基于结构面迹线分形维数的岩体质量评价. 工程地质学报, 26(s1): 505-512. DOI: 10.13544/j.cnki.jeg.2018237
    XU Zeshuang, WANG Mingchang, WANG Fengyan, HU Han, MENG Xiangyu, ZHAO Mingyu. 2018: EVALUATION OF ROCK MASS QUALITY ON FRACTRAL DIMENSION OF ROCK MASS DISCONTINUITY TRACE. JOURNAL OF ENGINEERING GEOLOGY, 26(s1): 505-512. DOI: 10.13544/j.cnki.jeg.2018237
    Citation: XU Zeshuang, WANG Mingchang, WANG Fengyan, HU Han, MENG Xiangyu, ZHAO Mingyu. 2018: EVALUATION OF ROCK MASS QUALITY ON FRACTRAL DIMENSION OF ROCK MASS DISCONTINUITY TRACE. JOURNAL OF ENGINEERING GEOLOGY, 26(s1): 505-512. DOI: 10.13544/j.cnki.jeg.2018237

    基于结构面迹线分形维数的岩体质量评价

    EVALUATION OF ROCK MASS QUALITY ON FRACTRAL DIMENSION OF ROCK MASS DISCONTINUITY TRACE

    • 摘要: 针对传统定性或部分定量的岩体质量评价现状,分形理论、神经网络等新方法得到广泛应用。本文基于岩体结构面迹线自相似性的分形特征,应用分形理论对基于数字近景摄影测量技术获取的岩体边坡结构面迹线的分形维数进行研究。以长春市净月采石场一边坡为例,采用方格网覆盖法计算结构面迹线的分形维数,验证了迹线分形特征,并对方格网覆盖法进行改进,采取与研究范围成比例的长方格网覆盖法计算分形维数。分析发现,两种计算方法结果相近,后者在理论上更接近分形原理并且编程更容易实现,迹线数量越多,分形维数越大,岩体越破碎,质量越差。最后,将分形维数与基于摄影测量方法获得的剔除空白区影响的RQD进行对比分析,确定分形维数与RQD的关系式,得到岩体质量定量评价的分形维数指标。研究表明:研究区边坡迹线分形维数为1.22,拟合度为0.98,此边坡岩体质量属于Ⅱ级。改进的长方形格网覆盖法分形维数计算容易实现,计算过程得到简化,结果可靠。得到了以岩体结构面迹线分形维数为指标的岩体质量定量评价方法。

       

      Abstract: Fractal theory、neural network and other new methods have been widely applied in the current qualitative or quantitative evaluation of rock mass quality. Based on the fractal characteristics of the self similarity of the surface of the rock mass, We applied fractal theory to study the fractal dimension of the surface trace of rock slope structure based on digital close range photogrammetry technology. Taking one side slope of pure moon quarry in Changchun as an example, We used the grid covering method to calculate the fractal dimension of the structural plane traces, and verified the fractal characteristics of traces. In addition, we also improved the grid coverage method, and used the rectangular grid coverage method which was proportional to the research scope to calculate the fractal dimension. The latter is closer to fractal theory and easier to program. It is found that the results of the two methods are similar, the more the trace number, the larger the fractal dimension, the more broken rock mass and the worse the mass, and the quality classification of rock mass can be more accurately determined by the rectangular grid method. Finally, we analyzed the fractal dimension and the RQD to determine the relationship between the fractal dimension and the RQD, and selected the RQD under the reasonable threshold, and got the rock mass quality evaluation method with the fractal dimension as the index. The research shows that the fractal dimension of the slope trace is 1.22and the fitting degree is 0.98and the quality of the slope rock mass belongs to the Ⅱ level. In addition, the improved calculation of the fractal dimension of the rectangular grid coverage method is easy to do. The calculation process is simplified and the result is reliable. A quantitative evaluation method of rock mass quality based on fractal dimension of trace line of rock mass structure is obtained.

       

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