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人工制备湿陷性黄土微观结构分析

ISSN号：1004-9665
期刊名称：《工程地质学报》
时间：0
分类：TU47[建筑科学—结构工程;建筑科学—土工工程]
作者机构：[1]兰州交通大学土木工程学院,兰州730070, [2]甘肃省道路桥梁与地下工程重点试验室,兰州730070
相关基金：国家自然科学基金项目（41402252,41262010,51408289）; 甘肃省科技计划项目（1506RJYA063）; 长江学者和创新团队发展计划（IRT1139）资助

作者：刘博诗[1,2], 张延杰[1], 王旭[1], 梁庆国[1], 李盛[1]

关键词：人工黄土, 湿陷性, SEM, 微观结构, Artificial loess, Collapsibility, SEM, Microstructure

中文摘要：

天然黄土具有很强的结构性,在采样、运输、制样过程中,都会对试样产生不可避免的扰动。本文基于Monte Carlo原理,选用无黏性材料石英粉、砂和黏结性材料膨润土、石膏和工业盐,采用空中自由下落法制备人工湿陷性黄土,并分别施加5k Pa、10k Pa、15k Pa竖向固结压力,固结9个月后取样进行土工试验和电镜扫描测试。土工试验结果表明：随着固结压力的增大,抗剪强度指标得到一定提升,湿陷峰值系数减小。通过扫描电镜微观结构分析表明：架空孔隙受固结压力作用影响较大,粒间孔隙对固结压力作用反应相对迟钝;随着固结压力的增大,颗粒的各向异性、面积比和等效直径增大,而扁圆度和充填比减小。土的内摩擦角、黏聚力和湿陷系数等力学参数与面积比、充填比、等效直径、各向异性、扁圆度等微结构性参数存在着良好的相关关系。从微观角度证明该人工制备湿陷性黄土是一种较为理想的湿陷性黄土模型试验相似材料。

英文摘要：

Natural loess,possessing strong structural characteristic,will suffer inevitable disturbance in the process of sampling,transportation and sample preparation. Based on the principle of Carlo Monte,non-cohesive materialsquartz powder and sand and cohesive materials-bentonite,gypsum and industrial salt were chosen to prepare artificial collapsible loess with the air fall method. Vertical consolidation pressure was applied to the soil with 5k Pa,10 k Pa and 15 k Pa separately,and after 9months soil samples were taken to conduct geotechnical test and electron microscope scanning test. The geotechnical test results show that： with increase of consolidation pressure,shear strength parameters are improved, and the peak coefficient of collapsibility is reduced. Analysis on SEM microstructure shows that consolidation pressure has great effect on overhead pore,while inter-granular pore is influenced relatively slightly by the consolidation pressure; with the increase of consolidation pressure,particle anisotropy,area ratio and equivalent diameter increase,while particle oblate degree and fill ratio decrease. There isa good relationship between soil mechanical parameters such as internal friction angle,cohesion strength and coefficient of collapsibility and microstructure parameters such as area ratio,fill ratio,equivalent,anisotropy,and oblate degree. From the microscopic point of view,it is proved that the artificial collapsible loess is a relatively ideal similar material for the collapsible loess model test.

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