| 引用本文: | 郭妍,王大雁,马巍,穆彦虎.冻土空心圆柱仪的研发与应用[J].哈尔滨工业大学学报,2016,48(12):114.DOI:10.11918/j.issn.0367-6234.2016.12.016 |
| GUO Yan,WANG Dayan,MA Wei,MU Yanhu.Development and application of frozen hollow cylinder apparatus[J].Journal of Harbin Institute of Technology,2016,48(12):114.DOI:10.11918/j.issn.0367-6234.2016.12.016 |
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| 摘要: |
| 为研究复杂应力路径条件下冻土的力学特性，中国科学院冻土工程国家重点实验室与美国GCTS公司合作研发了新型冻土力学试验设备-冻土空心圆柱仪(FHCA-300)，该设备通过独立施加内围压、外围压、轴向荷载和扭矩来改变3个主应力的大小和方向，从而更为真实地模拟冻土在地震荷载、交通荷载等多向应力和主应力轴旋转等复杂应力路径下的应力-应变行为.详细介绍了该仪器各部分的组成、传感器和动荷载频率的选取过程以及目前可实现的具体试验类型.此外，着重介绍了冻土空心圆柱仪温度控制系统的设计原理，并且对其控温能力进行了验证，结果证明该系统可以达到预期的降温能力和控温要求.最后利用冻土空心圆柱仪进行了主应力轴静态旋转和循环旋转测试试验，验证了仪器实现包括主应力轴旋转在内的复杂应力路径的能力，初步试验结果表明该设备能够准确再现冻土在复杂应力路径条件下的力学行为和变形行为，可为系统开展冻土在复杂应力条件下的强度、变形特性和本构关系等研究提供技术手段.
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| 关键词: 复杂应力路径 动荷载 力学性质 温度 冻土空心圆柱仪 |
| DOI：10.11918/j.issn.0367-6234.2016.12.016 |
| 分类号:TU445 |
| 文献标识码:A |
| 基金项目:国家重点基础研究发展计划(973项目)(2012CB026106)；冻土工程国家重点实验室基金(SKLFSE-2T-17)； 国家自然科学基金(41071048) |
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| Development and application of frozen hollow cylinder apparatus |
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GUO Yan1,2 , WANG Dayan1, MA Wei1, MU Yanhu1
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(1.State Key Laboratory of Frozen Soils Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2.University of Chinese Academy of Sciences, Beijing 100049, China)
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| Abstract: |
| To study mechanical properties of frozen soil under complex stress path, a novel frozen soil testing system-Frozen Hollow Cylinder Apparatus-300(FHCA-300) was developed by State Key Laboratory of Frozen Soils Engineering and the GCTS company in America. By independently controlling inner, outer confine pressure, axial load and torque, this apparatus can change the magnitude and direction of three principal stresses to accurately simulate the stress-strain behavior of frozen soil under complex stress path including the principal stress rotation and multriaxial stress induced by traffic or seismic. This paper introduced the components of FHCA-300, the selection process of sensors, the frequency of dynamic load and the concrete experimental types in details. The design principle of the temperature control system was concretely presented, and the temperature control ability was verified as well. The results show that the system can meet the desired temperature control requirements. For investigating the apparatus' performance of realizing the complex stress path including principal stress rotation, static principal stress axis rotation and cyclic rotation tests were designed, preliminary test results show that the instrument can accurately reproduce the frozen soil mechanical and deformation behaviors in complex stress path condition. It provides technical means for systematical researches on the strength, deformation characteristics and constitutive relation of frozen soil under complex stress condition.
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| Key words: complex stress path dynamic load mechanical properties temperature control FHCA-300 |
