Effect of Overburden Load on Salt Expansion of Gravelly Sand Sulfate Saline Soil Subgrade

被引：2

作者：

Zhang S. ^{[1
]}

Dai Z. ^{[2
]}

Yang X. ^{[1
]}

Chen W. ^{[3
]}

机构：

[1] School of Highway, Chang'an University, Xi'an, 710064, Shaanxi

[2] China Railway First Survey and Design Institute Group Co., Ltd., Xi'an, 710043, Shaanxi

[3] China Railway Eryuan Engineering Group Co., Ltd., Chengdu, 610031, Sichuan

来源：

Zhongguo Tiedao Kexue/China Railway Science | 2019年 / 40卷 / 02期

关键词：

Gravelly sand; Overburden load; Salt expansion; Subgrade engineering; Sulfate saline soil;

D O I：

10.3969/j.issn.1001-4632.2019.02.01

中图分类号：

学科分类号：

摘要：

Taking the subgrade engineering which needs to use local coarse-grained saline soil as filling material as the background, on the basis of artificial preparation of test soil samples, the gravelly sand sulfate saline soil samples from typical coarse-grained saline soil areas were chosen to study the influence of overburden load on the salt expansion of gravelly sand sulfate saline soil subgrade under different salt content, water content and initial dry density conditions, respectively. Results show that, under the action of overburden load, the salt expansion rate of gravelly sand sulfate saline soil decreases at significant amplitude with the increase of overburden load under different salt content conditions. The inhibitory effect of overburden load on gravelly sand sulfate saline soil with low salt content is better than that with high salt content. Under the condition of strict control in water content, when the overburden load exceeds 24.46~38.61 kPa, it plays a leading role in inhibiting salt expansion. Under the condition of standard compaction, the overburden load of 50 kPa with different water contents has an inhibitory effect of more than 85% on the salt expansion of natural gravelly sand sulfate saline soil. Moreover, the inhibitory effect on salt expansion is stronger under the condition of high water content, which can obviously reduce the salt expansion growth rate with the increase of water content. © 2019, Editorial Department of China Railway Science. All right reserved.

引用

页码：1 / 8

页数：7

共 18 条

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