片麻岩风化程度及其声发射规律试验研究

发布时间：2018-07-09 23:55

本文选题：水利工程 + 岩土工程　；参考：《重庆交通大学学报(自然科学版)》2016年06期

【摘要】：作为建筑地基使用的泰山片麻岩,埋藏浅、区域特征明显,其风化特性对土木工程稳定性的影响广泛而复杂。应力-应变关系试验发现,5组片麻岩试件的A、B、C-D和E组分别隶属于未风化、中等风化、强风化和全风化4种风化程度。力学性质试验时同步检测不同风化程度片麻岩的声发射信号,发现随片麻岩风化程度的提高,振铃计数率呈明显下降趋势;未风化及中等风化片麻岩的振铃计数率最高可达2 500次/s,具有能量累积并集中释放的特点,岩石脆性特征较明显;强风化片麻岩的振铃计数率平均约200次/s,声发射信号密集,岩石具有典型的延性特征;全风化片麻岩的平均振铃计数率仅约15次/s,声发射信号离散、无规律,岩石已等同于散体介质;得到了部分片麻岩风化程度与声发射之间的量化规律。建立的片麻岩风化程度与声发射关系,可应用于指导风化片麻岩地基的处理,寻求匹配的地基置换材料。
[Abstract]:Taishan gneiss, which is used for building foundation, is shallow buried and has obvious regional characteristics. The influence of weathering characteristics on the stability of civil engineering is extensive and complex. The stress-strain relationship tests show that the Agnite C-D and E groups of gneiss samples belong to four weathering degrees: unweathering, moderate weathering, strong wind and total weathering. The acoustic emission signals of gneiss with different weathering degree were detected synchronously during mechanical property test. It was found that the ringing count rate decreased obviously with the increase of weathering degree of gneiss. The ringing counting rate of unweathered gneiss and moderately weathered gneiss is up to 2 500 times / s, which has the characteristics of energy accumulation and concentrated release, and the characteristic of rock brittleness is obvious, the average ringing count rate of strongly weathered gneiss is about 200 times / s, and the acoustic emission signal is dense. The average ringing counting rate of the weathered gneiss is only about 15 times / s, the acoustic emission signal is discrete and irregular, and the rock is equal to the bulk medium. The quantitative law between weathering degree and acoustic emission of some gneiss is obtained. The relationship between weathering degree of gneiss and acoustic emission can be used to guide the treatment of weathered gneiss foundation and to seek for matching foundation replacement materials.
【作者单位】：山东农业大学水利土木工程学院;山东京博石油化工有限公司;山东省滨州市小清河管理局;
【基金】：国家自然科学基金项目(51004098;51574156) 山东省自然科学基金项目(ZR2014DM019)
【分类号】：TU45

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