透明砂土与天然砂土动力特性对比  

Comparison of dynamic properties between transparent sand and natural sand

作　　者：孔纲强[1] 李辉[1] 王忠涛[2] 文磊[1] KONG Gang-qiang;LI Hui;WANG Zhong-tao;WEN Lei(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210098, China;State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024

出　　处：《岩土力学》2018年第6期1935-1940,1947,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.51478165)~~

摘　　要：人工合成透明土材料在支撑岩土工程可视化模型试验技术领域得到了良好的应用。然而,关于该新型材料的动力特性研究仍相对缺少,一定程度上影响了其在动力相关模型试验中的推广应用。基于共振柱、动扭剪试验仪器,开展人工合成透明砂土的动变形与动强度特性试验研究,并与天然砂土及福建标准砂的相关动变形与动强度特性进行对比分析;透明砂土由折射率一致的熔融石英砂和混合油配制而成,混合油由15号白矿物油和正12烷按比例混合而成。试验测定并分析了透明砂土的动剪切模量-应变、阻尼比-应变、动剪切模量-阻尼比等关系曲线,以及孔压、动强度特征。试验结果表明,由熔融石英砂与混合油配制而成的透明砂土的动变形和动强度特性与天然砂土相似,可以模拟天然砂土材料开展动力相关模型试验研究。Synthetic transparent soil has been widely used to support technology of geotechnical visualization. However, the research on its dynamic properties is relative little, limiting its application in dynamic correlation model test. In this study, dynamic deformation and strength of transparent sand are examined by resonant column test and dynamic torsional shear test. The results are compared with those of the natural sand and Fujian standard sand. Transparent sand is manufactured by fused quartz and oil mixture with the same refraction index by Norpar？ 12 and Drakeol？ 15. The curves of dynamic shear modulus-strain, dynamic damping-strain, dynamic shear modulus-damping ratio, pore pressure, and dynamic strength are measured and analyzed. The dynamic properties of natural sand and Fujian standard sand are also shown for comparison. It is found that the transparent sand has similar dynamic behaviors as natural sand. Transparent sand shows a great potential as a substitute for natural sand, and it is expected to be widely used in dynamic model tests.

关 键 词：透明土 动剪切模量 阻尼比 动强度 共振柱试验 动扭剪试验 

分 类 号：TU435[建筑科学—岩土工程]