摘要
甘肃省甘谷-庄浪地区广泛分布新近系泥岩,其工程特性对建筑物地基、边坡等稳定性具有较大影响.综合分析区域地质资料,通过野外地质调查、取样试验分析等手段,以宏观和微观相结合的方式全面探讨研究区新近系泥岩工程特性.研究表明:新近系泥岩黏土矿物成分主要为伊/蒙混层、伊利石、高岭石、绿泥石,其地球化学成分以SiO2、Al2O3、Fe2O3、CaO为主,泥岩自由膨胀率一般小于3%,膨胀力小于100 kPa,天然状态单轴抗压强度小于5 MPa,天然抗压强度、抗剪强度(黏聚力、内摩擦角)均随着天然含水率的增加而减小.研究成果对泥岩地区工程建设地质灾害防治、工程设计、施工及安全运营等方面具有重要意义.
Abstract
Neogene mudstones are widely distributed in the Gangu-Zhuanglang area of Gansu Province.Their engineering characteristics have a significant impact on the stability of building foundations,slopes,and other structures.By comprehensively analyzing regional geological data and utilizing field geological surveys and sampling tests,this paper investigates the engineering characteristics of Neogene mudstones in the research area from both macro and micro perspectives.The research indicates that the clay minerals in Neogene mudstone is mainly composed of illite/montmorillonite mixed layer,illite,kaolinite,and chlorite.Its geochemical composition is mainly SiO2,Al2O3,Fe2O3,and CaO.The free expansion rate of mudstone is generally less than 3%,with an expansion force of less than 100 kPa,and its natural uniaxial compressive strength is less than 5 MPa.Both the natural compressive strength and shear strength(cohesion and internal friction angle)decrease as the natural moisture content increases.The research results are of great significance for the prevention and control of geological hazards,engineering design,construction,and safe operation in mudstone areas.
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