【作者】 张耀；

【导师】 胡卸文；

【作者基本信息】 西南交通大学 ， 地质工程， 2012， 硕士

【摘要】 以舟山大陆连岛工程为依托,交通部开展了题为“跨海特大跨径钢箱梁悬索桥结构特性及技术标准研究”的国家科技支撑计划课题,本文以该课题的子课题“海域岛礁桥梁地基岩体质量分类体系指南研究”为契机,结合西堠门大桥的工程实践,以北塔基老虎山岛礁为研究对象,以分级方法的发展趋势及对比分析为指导,以海域岛礁岩体的工程地质特点为基础,以岩体质量分级控制因素的选取原则为依据,开展海域岛礁岩体质量分类体系研究。论文首先总结了岩体质量分级方法的发展趋势,并对国内外多种岩体质量分级(类)方法进行了归类和对比分析,确定采用多因素多指标的复合指标分级方法用于海域岛礁岩体分级。随后从老虎山岛礁的工程地质条件出发,系统归纳了海域岛礁岩体的工程地质特点。依据分级因素的选取原则,采用岩石力学性质、岩体结构类型、结构面发育特征、风化状况、地下水条件5项分级控制因素,作为海域岛礁岩体质量分级体系的基本单元。并分别选取岩石单轴饱和抗压强度RQb、岩石质量指标RQD(或岩体块度指数RBI)、岩体完整性系数Kv、风化程度系数KY对上述分级控制因素进行量化分界,然后根据因素乘积法建立上述指标间的函数关系Z(Rb,RQD,Kv,KY)或Z(Rb,RBI,Kv,KY),并视地下水状况采用地下水影响修正值T对岩体质量基本评分值Z进行修正,最终以岩体质量修正评分值[Z]作为评价岩体质量级别的复合指标。之后,选取国内外有代表性的岩体质量分级方法对海域岛礁岩体质量分级体系进行了可靠性验证。基于海域岛礁岩体质量分级体系,开展了老虎山岩体质量分级和结构面工程地质分类,结合对海域岛礁岩体的力学参数取值研究,建立了反映老虎山桥基边坡质量的综合岩体质量分级(含结构面)及其配套的变形和强度参数体系。最后,提出了指南编制的指导思想与原则,确定了指南的主要内容和体系结构,为制定《海域岛礁岩体质量分类体系指南》奠定了基础。更多还原

【Abstract】 Based on Zhoushan mainland link project, The Ministry of Transport started a national technology project titled "Study on Structure Characteristics and Technical Standards of Long Span Suspension and Steel Box Girder Sea-Crossing Bridge", this thesis takes the opportunity of the sub research project of "Study on the Guide of Rock mass Quality Classification System of Sea Reefs as Bridge Foundation", depends on the engineering practice of Xihoumen Bridge, takes the north tower foundation of Laohu island as research object, guided by the development tendency and comparative analysis of classification methods, based on the engineering geological characteristics of reef rock mass and according to the select principle of classification control factors, to carry out the research of reef rock mass classification system.In the thesis, the development tendency of classification methods is summarized firstly, followed by a sortation and comparative analysis among different kinds of classification methods both in and abroad, and chooses the classification method of multi-factors and multi-indexes with a complex index for reef rock mass classidfication. Subsequently, from the engineering geological characteristics of the Laohu island, the engineering geological characteristics of the reef rock mass are concluded systematically. Abide by the select principle of classification control factors, use5classification control factors of rock mechanical property, rock mass structure type, characteristics of discontinuities, weathering conditions and groundwater conditions as the basic elements of reef rock mass quality classification system, and use uniaxial saturated compressive strength Rb, rock quality designation index RQD (or rock block index RBI), rock mass integrality coefficient Kv, weathering degree coefficient Ky to quantify and compartmentalize the classification factors mentioned above. Then, according to factor multiplication method the functional relation between these indexes of Z(Rb,RQD,Kv,Ky) or Z(Rb,RBI,Kv,Ky) is built up, and a modifier T which depends on groundwater conditions is used to modify the basic scoring value Z, and finally take the modified scoring value [Z] as the complex index which indicates the quality level of the rock mass. After that, the dependability of reef rock mass classification system is validated by several rock mass classification methods commonly used both in and abroad.Based on the reef rock mass classification system, the study on rock mass quality classification and engineering geological rating of discontinuities of the Laohu island are carried out, combined with the value-taking of mechanical parameters of the rock mass, the comprehensive rock mass (including discontinuities) classification of the Laohu island and corresponding value-taking system of deformation and strength parameters are built up. Finally, the guideline and principles for the establishment of the classification guide are presented, and the main contents and Structure are determined too, which lay the foundation for the establishment of Guide on Rock mass Quality Classification System of Sea Reefs.更多还原