构皮滩水电站边坡岩体结构面概率模型与岩体质量分级研究及应用

【作者】 柳群义；

【导师】 隆威； 苏爱军；

【作者基本信息】 中南大学 ， 地质工程， 2005， 硕士

【摘要】 岩体是赋存于一定地质环境中,由各种各样的结构面所切割,具有一定工程地质特性的岩石综合体。结构面是岩体中的破裂面或物质分异面。结构面控制着岩质边坡的变形和破坏,决定着岩质边坡的稳定性。 本文以发育于构皮滩水电站右岸拱间槽边坡中的结构面为研究对象。运用概率统计的理论和方法,分析了边坡区所发育的各种结构面的几何特征参数,包括结构面的产状、间距和密度、规模、隙宽等,得到了用以描述这些参数的概率模型;运用Bayes理论和方法,得到了结构面抗剪强度力学参数的概率模型;运用计算机模拟技术,模拟了边坡区结构面的分布情况,得到了边坡区随机块体的大小、深度等情况,并简要分析了随机块体的稳定性。 由于岩体质量分级直接反映岩体固有属性和力学特性,关系到岩体的优劣程度、工程适用性及可利用性和应采取的工程处理措施,一直是水利工程建设所面临的重大课题之一。文中结合边坡区地质条件和工程条件,选用岩体完整性指标、岩块单轴饱和抗压强度、结构面状态、结构面发育程度、岩体透水性、变形特征、岩溶及断层发育状况等七个指标,将各指标划为不同的等级,用模糊数学的方法,获得各指标的权重,将这7个指标转换的分值相加,按不同的得分情况,将边坡区岩体划分为不同的五个等级。提出了一个新的岩体质量分级计算公式:RQ=0.352RQD+0.037R_b+0.104J+0.242D+0.160ω+0.037E+6.8A。依照研究结果,提出了边坡的综合支护方法。更多还原

【Abstract】 Rock mass is synthetic geologic mass, lied in definite geologic surrounding, divided by various structure plane and had definite engineering geologic characteristic. Structure plane is a fracture plane or substance differentiation plane in rock mass. It controls the distortion, the breakage, and the stability of rock slope.In this thesis, taken the structure plane developed in rock slope of arch dam at right side of Goupitan hydropower station as the object, the geometry character parameters, such as orientation, spacing and density, size and aperture were analyzed by using the theory and method of probability and statistics. The probability models, which were used to depict these parameters, were obtained. And the models for shear strength parameters of structure plane were obtained by using the theory and method of Bayes. The distribution condition of structure plane in slope zone was simulated by using computer simulation technique, and some parameters, such as the size and depth of random block, obtained. The stability of random block was analyzed briefly.The rock mass classification, which reflects the intrinsic property and the mechanics characteristic of rock and relates to the senior or inferior grade of rock mass, engineering applicability, availablity and the methods that treat with the rock mass, is always one of the main problems in hydropower station construction. With the combination of geologic and engineering conditions, seven indexes, which are the intactness index of rock mass, the saturated uniaxial compressive strength of rock mass, the state of structure plane, the developed degree of structure plane, the permeability of rock mass, the deformation character and the developed status of karst and fault, were chosen, divided every index into different grade, acquired the weight of every index by using method of fuzzy maths. Partitioned the rock mass of slope into five grades by added the score of every index. A new formula was brought out on the classification of rock mass: RQ = 0.352RQD + 0.037R_b +0.104J + 0.242D + 0.160ω + 0.037E + 6.8A. According to the research result, it brought out a composite method about the supporting of the slope in this paper.更多还原