Effect of Cyclic Freezing and Thawing  on Physical and Mechanical Properties of Soft Soil

WANG Ping; GUO Wei-jie; LI Hong-feng; LU Hong-jun

doi:10.11988/ckyyb.20170240

PDF(1762 KB)

Journal of Changjiang River Scientific Research Institute ›› 2018, Vol. 35 ›› Issue (7) : 79-83. DOI: 10.11988/ckyyb.20170240

ROCKSOIL ENGINEERING

Effect of Cyclic Freezing and Thawing on Physical and Mechanical Properties of Soft Soil

WANG Ping,GUO Wei-jie,LI Hong-feng,LU Hong-jun

Author information +

History +

Abstract

Indoor cyclic freeze-thaw test was carried out to examine the law of heave and settlement of soft soil under cyclic freezing and thawing as well as the changes in mechanical properties. The expansion and shrinkage of specimen’s volume were measured by changing the number of freeze-thaw cycle; in the meantime, the shear strength of soft soil under different freeze-thaw cycles and varying confining pressure were measured by indoor triaxial test. Test data and microscopic analysis revealed that the rate of volume change augmented with the proceeding of cyclic freezing and thawing; after six freeze-thaw cycles, the heaving rate and settlement rate of soft soil maintained unchanged in general. With the proceeding of cyclic freezing and thawing, the shear strength of soft soil increased first and then decreased, reaching the minimum at the sixth cycle; but finally recovered in the subsequent 6-15 cycles, approa-ching to the value before freezing and thawing. Moreover, freeze-thaw cycle had significant effect on the cohesion of soft clay, but had no correlation with internal friction angle φ.

Key words

soft soil / freeze-thaw cycle / triaxial test / frost heave and thawing settlement / shear strength

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

WANG Ping,GUO Wei-jie,LI Hong-feng,LU Hong-jun. Effect of Cyclic Freezing and Thawing on Physical and Mechanical Properties of Soft Soil[J]. Journal of Changjiang River Scientific Research Institute. 2018, 35(7): 79-83 https://doi.org/10.11988/ckyyb.20170240

References

[1] 缪林昌. 软土力学特性与工程实践[M]. 1版. 北京: 科学出版社, 2012.
[2] 胡汉兵, 胡胜刚. 软土路堤工后沉降监测、分析与控制[J]. 长江科学院院报, 2010, 27(4): 40-43.
[3] 肖广平. 天津滨海软土次固结蠕变特性及微观特征试验研究[D]. 长春: 吉林大学, 2016.
[4] 汤恒. 唐山地区滨海相软土地基处理技术研究[D]. 天津: 天津大学, 2013.
[5] 康春光. 软土地区路基沉降和侧向变形影响的预测分析[D]. 天津: 河北工业大学, 2014.
[6] 齐吉琳, 马巍. 冻土的力学性质及研究现状[J]. 岩土力学, 2010, 31(1): 133-143.
[7] SILL R C, SKAPSKI A S. Method for the Determination of the Surface Tension of Solids, from Their Melting Points in Thin Wedges[J]. Journal of Chemical Physics, 1956, 24(4): 644-651.
[8] GOLD L W. A Possible Force Mechanism Associated with the Freezing of Water in Porous Materials[J]. Highway Research Board Bulletin, 1957, 168: 65-72.
[9] EVERETT D H. The Thermodynamics of Frost Damage to Porous Solids[J]. Transactions of the Faraday Society, 1961, 57(5): 1541-1551.
[10]HARLAN R L. Analysis of Coupled Heat-fluid Transport in Partially Frozen Soil[J]. Water Resources Research, 1973, 9(5): 1314-1323.
[11]GUYMON G L, HROMADKA T V, BERG R L. A One-dimensional Frost Heave Model Based upon Simulation of Simultaneous Heat and Water Flux[J]. Cold Regions Science and Technology, 1980, 3(2/3): 253-262.
[12]MILLER R D. Freezing and Heaving of Saturated and Unsaturated Soils[J]. Highway Research Record, 1972, (393): 1-11.
[13]MORGENSTERN N R, NIXON J F. One-dimensional Consolidation of Thawing Soils[J]. Canadian Geotechnical Journal, 2011, 8(4): 558-565.
[14]FORIERO A, LADANYI B. FEM Assessment of Large-strain Thaw Consolidation[J]. Journal of Geotechnical Engineering, 1995, 121(2): 126-138.
[15]马宏岩, 张锋, 冯德成, 等. 单向冻结条件下饱和粉质黏土的冻胀试验研究[J]. 建筑材料学报, 2016, 19(5): 926-932.
[16]丁智, 张孟雅, 魏新江, 等. 地铁循环荷载下冻融软土孔压发展及微观结构研究[J]. 岩石力学与工程学报, 2016, 35(11): 2328-2336.
[17]王伟, 池旭超, 张芳, 等. 冻融循环对滨海软土三轴应力应变曲线软化特性的影响[J]. 岩土工程学报, 2013, 35(增2): 140-144.
[18]武尚, 刘佑荣, 李世佳. 三轴压缩条件下灰岩力学特性试验及力学模型研究[J]. 长江科学院院报, 2013, 30(3): 30-34.
[19]张玉, 徐卫亚, 赵海斌, 等. 碎屑砂岩三轴压缩下强度和变形特性试验研究[J]. 岩土力学, 2014, 35(3): 666-674.
[20]乐崇浩. 三轴减压条件下裂隙性黄土的力学特性研究[D]. 西安: 长安大学, 2012.
[21]胡学涛, 梁冰, 陈亿军, 等. 冻融循环对固化污泥力学及微观结构特性影响[J]. 岩土力学, 2016, 37(5): 1317-1323.
[22]常丹, 刘建坤, 李旭, 等. 冻融循环对青藏粉砂土力学性质影响的试验研究[J]. 岩石力学与工程学报, 2014, 33(7): 1496-1502.
[23]张英, 邴慧, 杨成松. 基于SEM和MIP的冻融循环对粉质黏土强度影响机制研究[J]. 岩石力学与工程学报, 2015, 34(增1): 3597-3603.
[24]郑郧, 马巍, 李国玉, 等. 一个考虑冻融循环作用的结构性定量参数的试验研究[J]. 岩土工程学报, 2016, 38(7): 1339-1344.