不同温度及排水条件下高温冻土孔隙水压力试验研究

doi:10.7522/j.issn.1000-0240.2018.0125

冰川冻土 ›› 2018, Vol. 40 ›› Issue (6): 1167-1172.doi: 10.7522/j.issn.1000-0240.2018.0125

不同温度及排水条件下高温冻土孔隙水压力试验研究

王宁宁¹, 张虎², 张建明², 赵忠虎¹, 周攀峰³

1. 兰州大学土木工程与力学学院, 甘肃兰州 730000;
2. 中国科学院西北生态环境资源研究院冻土工程国家重点实验室, 甘肃兰州 730000;
3. 核工业广州工程勘察院, 广东广州 510800

收稿日期:2018-02-23 修回日期:2018-10-25 出版日期:2018-12-25 发布日期:2019-01-21
通讯作者: 张虎,E-mail:zhanghu@lzb.ac.cn E-mail:zhanghu@lzb.ac.cn
作者简介:王宁宁(1993-),男,内蒙古赤峰人,助理工程师,2018在兰州大学获硕士学位,从事冻土力学与岩石力学方面的研究.E-mail:wangnn15@lzu.edu.cn
基金资助:
国家自然科学基金项目（41401087）；冻土工程国家重点实验室自主研究课题项目（SKLFSE-ZT-35）；青海省交通科学研究院项目（Y490E21001）资助

Experimental study of pore water pressure of high temperature frozen soil under different temperatures and drainage conditions

WANG Ningning¹, ZHANG Hu², ZHANG Jianming², ZHAO Zhonghu¹, ZHOU Panfeng³

1. School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China;
2. State Key Laboratory of Frozen Soils Engineering, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
3. Guangzhou Academy of Nuclear Engineering Investigation, Guangzhou 510800, China

Received:2018-02-23 Revised:2018-10-25 Online:2018-12-25 Published:2019-01-21

摘要/Abstract

摘要： 在荷载的作用下孔隙水压力的消散是揭示冻土整体变形机理的关键，为了研究高温冻土中孔隙水压力变化规律，在不同温度、不同排水条件下，对高温冻土开展了压缩固结试验，并监测其在-1℃、-0.5℃和-0.3℃的条件下孔隙水压力及位移变化情况。结果表明：温度对孔压、变形有较大影响，温度越高，土体的变形速率越大，孔隙水压力峰值越大，消散速率也越快；而温度相同时，排水条件下的孔压峰值比不排水条件下的低，位移比不排水条件下的大；从试验结果中可以认识到，孔隙水压力在受骨架挤压增大的同时也在缓慢消散。

关键词: 高温冻土, 温度, 孔隙水压力, 消散速率

Abstract: Variation of pore-water pressure is a key to reveal the deformation mechanisms of soil under an external load. In order to study the property of pore-water pressure in warm frozen soil, compressive consolidation experiment under different temperatures and different drainage conditions have been carried out. The pore-water pressure and displacement at -1, -0.5 and -0.3℃ were monitored respectively. The results reveal that temperature has great effect on pore-water pressure and deformation of warm frozen soil. When the temperature is higher, the deformation rate of the soil, the peak pore-water pressure and the rate of dissipation are greater. At the same temperature, the peak pore-water pressure under drainage condition is lower than that under non-drainage condition, but the displacement is larger than the latter. It can be found from the results that the pore-water pressure is subjected to two actions simultaneously:increase caused by solid skeleton compression and slowly dissipation.

Key words: high-temperature frozen soil, temperature, pore water pressure, dissipation rate

中图分类号:

P642.14

王宁宁, 张虎, 张建明, 赵忠虎, 周攀峰. 不同温度及排水条件下高温冻土孔隙水压力试验研究[J]. 冰川冻土, 2018, 40(6): 1167-1172.

WANG Ningning, ZHANG Hu, ZHANG Jianming, ZHAO Zhonghu, ZHOU Panfeng. Experimental study of pore water pressure of high temperature frozen soil under different temperatures and drainage conditions[J]. Journal of Glaciology and Geocryology, 2018, 40(6): 1167-1172.

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不同温度及排水条件下高温冻土孔隙水压力试验研究

Experimental study of pore water pressure of high temperature frozen soil under different temperatures and drainage conditions

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