An open frozen-heave test on the pipeline foundation soils in the permafrost regions

被引：0

作者：

Wang W. ^{[1
]}

Zhang X. ^{[2
]}

Lü Y. ^{[2
]}

机构：

[1] School of Prospecting and Surveying, Changchun Institute of Technology, Changchun, 130021, Jilin

[2] College of Construction Engineering, Jilin University, Changchun, 130026, Jilin

来源：

| 1600年 / Natural Gas Industry Journal Agency卷 / 37期

关键词：

Closed frozen-heave test; Displacement limiting method; Frozen-heave factor; Normal frozen-heave force; Open frozen-heave test; Regression analysis; Static equilibrium method; The t test;

D O I：

10.3787/j.issn.1000-0976.2017.10.013

中图分类号：

学科分类号：

摘要：

In the Da Hinggan Mountains, the safe and smooth operation of shallowly buried oil pipelines is threatened greatly by the frozen-heave damage derived from frozen soil. At present, a closed frozen-heave simulation test is often carried out in China, with water content and dry density of samples being assumed to be constant. However, an open frozen-heave test, all the factors of which change as the test goes on, can reflect the real frozen-heave damage more accurately. In this paper, the open frozen-heave test was carried out on five types frozen soil along the China-Russia Crude Oil Pipeline to measure the frozen-heave factor and water content of each soil sample and accordingly analyze their relationship. Besides, its test results were compared with that of the closed frozen-heave test. Then, the normal frozen-heave force was measured by using the displacement limiting method, and this measurement was compared with the result of the static equilibrium test. Finally, a difference significance test was conducted. It is shown that the frozen-heave factor of the open test is higher than that of the closed test; the frozen-heave factor of fine grained soil has a significant effect on the frozen-heave factor of soils, and the frozen-heave factor increases as the capillary effect or the swabbing action of soil increases; the frozen-heave factor of coarse grained soil is mainly dependent on the mud content, and it is lower than that of fine grained soil; the value of frozen-heave force is in close relation with the test methods and the sample height; it is indicated that the open frozen-heave test is more applicable to the investigation on the frozen-heave of the foundation soils of pipelines in the Da Hinggan Mountains. It is concluded that the soils for the cushion and digging/packing layers of the pipelines in the permafrost regions shall be acted by the gravel or detritus with lower mud content, and waterproof and draining pipeline jetty shall be made from the clay soils with a higher plasticity. © 2017, Natural Gas Industry Journal Agency. All right reserved.

引用

页码：93 / 99

页数：6

共 18 条

[1] Jin H., Yu W., Chen Y., Gao X., Li F., Yao Z., (Differential) Frost heave and thaw settlement in the engineering design and construction of oil pipelines in permafrost regions: A review, Journal of Glaciology and Geocryology, 27, 3, pp. 454-464, (2005)
[2] Dong B., The research on frozen ground thawing settlement characteristics and engineering measures at Mohe-Tahe section of Sino-Russian oil pipeline project, (2008)
[3] Guo G., Research on influencing factor of permafrost thaw settlement characteristic, (2008)
[4] Chen Y., The statistical analysis and classification study on thawing settlement characteristic of permafrost, (2008)
[5] Lu L., The experimental analysis and study on thawing settlement characteristics of frozen soil, (2009)
[6] Lu Y., Leng Y., Jiang L., Zhang X., A study of classification of thaw-settlement properties of permafrost, Journal of Glaciology and Geocryology, 33, 4, pp. 760-764, (2011)
[7] Zhang Y., Li X., Zhang X., Zhang D., Research on frost heave susceptibility and classification of coarse grained soil of highway subgrade in seasonally frozen ground region, Chinese Journal of Geotechnical Engineering, 29, 10, pp. 1522-1526, (2007)
[8] Leng Y., Zhang X., Zhang D., Study of frost heaving susceptibility of fine-grain soil of highway subgrade in seasonally frozen ground regions, Journal of Glaciology and Geocryology, 28, 2, pp. 211-216, (2006)
[9] Jiang L., Research on the frost heaving sensibility and classification of highway subgrade coarse-grained soil in seasonally frozen ground region, (2006)
[10] Wang W., Zhang X., Li X., Research on experiment of frost heaving susceptibility of several typical soils in Daxingganling mountains, Low Temperature Architecture Technology, 31, 9, pp. 106-108, (2009)

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