冻土动力学参数研究的成果综述与展望

doi:10.7522/j.isnn.1000-0240.2015.0178

冰川冻土 ›› 2015, Vol. 37 ›› Issue (6): 1611-1626.doi: 10.7522/j.isnn.1000-0240.2015.0178

冻土动力学参数研究的成果综述与展望

肖东辉^{1 2}, 马巍¹, 赵淑萍³, 张泽¹, 蔡聪^{1 2}

1. 中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室, 甘肃兰州 730000;
2. 中国科学院大学, 北京 100049;
3. 南京师范大学地理科学学院, 江苏南京 210000

收稿日期:2015-09-14 修回日期:2015-12-05 出版日期:2015-12-25 发布日期:2016-05-11
通讯作者: 赵淑萍,E-mail:shuping@njnu.edu.cn. E-mail:shuping@njnu.edu.cn
作者简介:肖东辉(1989-),男,山东临沂人,2012年毕业于曲阜师范大学,现为中国科学院寒区旱区环境与工程研究所在读博士研究生,从事冻土力学与寒区工程研究.E-mail:xiaodonghui@lzb.ac.cn
基金资助:
国家重点基础研究发展计划(973计划)项目(2012CB026106);甘肃省交通运输厅科技项目(2014-03);国家自然科学基金项目(41301070;41501072);中国科学院"西部之光"博士项目(2013-03)资助

Study of the dynamic parameters of frozen soil: achievements and prospects

XIAO Donghui^{1 2}, MA Wei¹, ZHAO Shuping³, ZHANG Ze¹, CAI Cong^{1 2}

1. State Key Laboratory of Frozen Soil 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;
3. College of Geographical Sciences, Nanjing Normal University, Nanjing 210000, China

Received:2015-09-14 Revised:2015-12-05 Online:2015-12-25 Published:2016-05-11

摘要/Abstract

摘要： 通过对前人的试验成果进行整理, 得到冻土动力学参数随温度、频率、应变幅、含水量和围压等因素的整体变化规律. 整体上看, 冻土的动弹性模量和动剪切模量随温度的降低而增大、随荷载振动频率的增加而增大、随动应变幅的增加而减小、随含水量的增加先增大后减小、随围压的增加而增大; 冻土的泊松比随温度的降低而增大; 冻土的阻尼比随温度的降低而减小, 随频率、应变幅、含水量、围压的变化规律性不强. 通过对试验条件和数值模拟时的实际工况对比分析, 给出如下建议: 动弹性模量和动剪切模量的预估适合用两段式线性模型, -5℃可以作为两段式的分界点; 列车荷载作用下冻土的动力响应属于小应变幅的振动, 冻土动力学参数应选择波速法的试验结果.

关键词: 冻土, 动模量, 阻尼比, 泊松比, 动三轴法, 波速法, 温度

Abstract: The variation of dynamic parameters of frozen soils based on the previous test results were summarized. From the summary one can see that all the dynamic parameters in frozen soils are depended on temperature, frequency, strain amplitude, water content and confining pressure. The dynamic young's modulus and shear modulus of frozen soils increase with decreasing temperature, increase with frequency, decrease with increasing dynamic strain amplitude, increase first and then decrease with water content and increase with confining pressure; the Poisson's ratio of frozen soils increases with decreasing temperature; The damping ratio of frozen soils decreases with temperature drop, but not varies clearly with frequency and strain amplitude and water content and confining pressure. By comparative analysis of the conditions of experiments and actual working conditions in numerical simulation, the following suggests are put forward: predicted values of dynamic young's modulus and shear modulus suit to be descripted with two-section linear models, demarcated at -5℃; Dynamic response of frozen soil to train loads belongs to the response of small strain amplitudes, thus, the dynamic parameters of the frozen soil should choose that from wave velocity method.

Key words: dynamic modulus of frozen soil, damping ratio, Poisson's ratio, dynamic triaxial method, wave velocity method, temperature

中图分类号:

P642.14

肖东辉, 马巍, 赵淑萍, 张泽, 蔡聪. 冻土动力学参数研究的成果综述与展望[J]. 冰川冻土, 2015, 37(6): 1611-1626.

XIAO Donghui, MA Wei, ZHAO Shuping, ZHANG Ze, CAI Cong. Study of the dynamic parameters of frozen soil: achievements and prospects[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2015, 37(6): 1611-1626.

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冻土动力学参数研究的成果综述与展望

Study of the dynamic parameters of frozen soil: achievements and prospects

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