峨胜石灰石矿山露采高边坡岩体结构特征及其强度参数研究
发布时间：2019-04-16 17:18
【摘要】：随着我国经济建设的高速发展,基础建设与资源开采的规模不断扩大,随之也面临着大量的工程地质难题。尤其是在石灰石矿山的开采过程中,往往会形成大规模、工程地质条件复杂的高边坡。往往也正是由组成高边坡的节理岩体决定了矿山高边坡的稳定性。节理岩体是由结构面与完整岩石组合而成的复杂综合体。正是节理岩体结构的复杂性决定了其力学性质的非均匀、非线性和各向异性。节理岩体的强度特性不仅受其内部岩石与结构面强度的影响,同时也受到结构面不同组合形式对强度的劣化作用。对节理岩体结构特征及强度参数的研究是进行岩体工程力学性质评价与稳定性分析的重要环节。本文以峨胜石灰石矿山露采高边坡岩体为研究对象,对节理岩体强度参数特性进行了系统研究。在野外工程地质调查与地质资料收集统计的基础上,结合三维离散元数值计算方法和经验估算方法,对节理岩体强度参数的尺寸效应与各向异性进行了探讨,并对岩体工程中合理选取节理岩体强度参数提供了参考。本文的研究内容如下:(1)对研究区进行工程地质调查与分析,进一步以岩体结构差异对研究区进行分区。采用测线法对每个区进行现场结构面测量与统计。Ⅰ区测量结构面50条,含优势结构面一组;Ⅱ区测量结构面106条,含优势结构面两组;Ⅲ区测量结构面323条,含优势结构面四组。(2)结合图解法和改进的快速聚类分析法,对各区优势结构面进行了统计分组。进一步采用概率图法得出了对各区结构面的几何特征参数的概率分布类型。结果显示结构面倾向和倾角大部分符合正态分布规律,少数符合均匀分布。结构面间距和半迹长则符合负指数分布规律。(3)以结构面几何分布概率模型为基础,结合蒙特卡洛法与Fish编程语言实现了在3DEC软件中三维结构面网络模型的建立。分析各区网络模型可知,其中一区岩体结构完整性好,仅受岩层面切割。二区受两组互相垂直节理切割,岩体呈块状结构。三区岩体受四组优势结构面切割,岩体完整性较差。(4)在三维结构面网络模型基础上,进一步实现了三种岩体结构下的等围压三轴数值试验,其中对于随机节理岩体模型采用了DFN裂隙网络模型和蒙特卡罗法相结合,使数值计算能够比较真实的模拟实际岩体的受力状态。对岩体强度参数的各向异性和尺寸效应进行了研究。结果表明不同岩体结构的岩体其尺寸效应和各向异性也不同。受结构面切割程度越高,岩体尺寸效应趋于明显,而各向异性会相对减弱。(5)结合离散元数值计算结果、RMR评分系统和GSI评分系统下Hoek-Brown强度准则对研究区节理岩体强度参数进行估算。结果显示三种方法得出的岩体强度参数中,RMR评分系统最小、GSI评分系统中等,离散元数值方法最大。
[Abstract]:With the rapid development of economic construction in China, the scale of infrastructure construction and resource exploitation is expanding constantly, and a large number of engineering geological problems are also faced with. Especially in the process of limestone mining, large-scale, complex engineering geological conditions will often form a high slope. The stability of mine high slope is often determined by the jointed rock mass which is composed of high slope. Jointed rock mass is a complex composed of structural plane and intact rock. It is the complexity of jointed rock mass structure that determines the non-uniformity, nonlinearity and anisotropy of its mechanical properties. The strength characteristics of jointed rock mass are not only affected by the strength of the internal rock and the structural plane, but also by the deterioration of the strength of the jointed rock mass by different combination forms of the structural plane. The research on the structural characteristics and strength parameters of jointed rock mass is an important link in the evaluation and stability analysis of rock mass engineering mechanical properties. In this paper, the strength parameter characteristics of jointed rock mass are studied systematically by taking the open-pit high slope rock mass of Esheng limestone mine as the research object. On the basis of field engineering geological survey and geological data collection statistics, combined with three-dimensional discrete element numerical calculation method and empirical estimation method, the size effect and anisotropy of strength parameters of jointed rock mass are discussed. It also provides a reference for reasonable selection of strength parameters of jointed rock mass in rock mass engineering. The research contents of this paper are as follows: (1) the engineering geological investigation and analysis are carried out in the study area, and the difference of rock mass structure is further used to divide the study area. The field structural planes of each area were measured and counted by the method of measurement. 50 structural planes were measured in area 鈪，
本文编号：2458954
[Abstract]:With the rapid development of economic construction in China, the scale of infrastructure construction and resource exploitation is expanding constantly, and a large number of engineering geological problems are also faced with. Especially in the process of limestone mining, large-scale, complex engineering geological conditions will often form a high slope. The stability of mine high slope is often determined by the jointed rock mass which is composed of high slope. Jointed rock mass is a complex composed of structural plane and intact rock. It is the complexity of jointed rock mass structure that determines the non-uniformity, nonlinearity and anisotropy of its mechanical properties. The strength characteristics of jointed rock mass are not only affected by the strength of the internal rock and the structural plane, but also by the deterioration of the strength of the jointed rock mass by different combination forms of the structural plane. The research on the structural characteristics and strength parameters of jointed rock mass is an important link in the evaluation and stability analysis of rock mass engineering mechanical properties. In this paper, the strength parameter characteristics of jointed rock mass are studied systematically by taking the open-pit high slope rock mass of Esheng limestone mine as the research object. On the basis of field engineering geological survey and geological data collection statistics, combined with three-dimensional discrete element numerical calculation method and empirical estimation method, the size effect and anisotropy of strength parameters of jointed rock mass are discussed. It also provides a reference for reasonable selection of strength parameters of jointed rock mass in rock mass engineering. The research contents of this paper are as follows: (1) the engineering geological investigation and analysis are carried out in the study area, and the difference of rock mass structure is further used to divide the study area. The field structural planes of each area were measured and counted by the method of measurement. 50 structural planes were measured in area 鈪，
本文编号：2458954
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