岩体工程力学参数取值方法研究Ⅰ:原位试验与定量类比

针对合理确定岩体工程力学参数的难题,在原位试验技术、定量类比方法和数值仿真试验等方面开展了系统研究,形成了包含“一设备、一库、一平台”综合确定岩体工程力学参数的方法体系。本文研发了适用于常规地质钻探的岩体质量随钻测试和岩体力学参数原位试验设备,建立了依据随钻实测参数评价岩体质量的方法以及岩体强度、耐磨性指标与随钻参数的定量关系,提出了通过孔内弹模剪切试验快速获取不同岩层岩体抗剪强度和弹性模量的技术和方法;同时,构建了包含81个工程681组不同类型岩体抗剪强度试验资料数据库,深入研究了不同类型岩体抗剪强度参数的统计特性,提出了基于Bayes方法和可靠度理论,利用大样本数据库资料和少量具体工程试验成果来确定岩体参数的定量类比方法。

Study of determination methods of rock mass mechanical parameters I:In-situ test and quantitative analogy

Aiming at the problem of reasonable determination of the mechanical parameters of rock mass in engineering, the systematic research on in-situ test techniques, quantitative analogy methods and numerical simulations was conducted, and a system for the comprehensive determination of rock mass mechanical parameters including "one equipment, one library and one platform" was established. First, the test equipment for evaluation of rock mass quality during drilling process and determination of mechanical parameters of rock mass based on borehole was developed in this paper, and a method to evaluate rock mass quality based on the measured parameters while drilling and the quantitative relationship between the strength and wear resistance of rock mass and the parameters while drilling was proposed. The technique of quickly obtaining the shear strength and comprehensive elastic modulus of rock mass from different rock strata by elastic modulus and shear test in borehole were presented. Then, a database composed of the shear strength parameters of rock mass of 681 groups from 81 projects was constructed, and the statistical characteristics of the shear strength parameters of different rock mass were studied. Based on Bayes method and reliability theory, a quantitative analogy method was proposed to determine rock mass parameters by use of the sample data in the database and few test results in engineering.