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Law of Water Content Change in subgrade soil Under Action of Dry-Wet Cycle

Transactions of Nanjing University of Aeronautics and Astronautics 2021年第S1期38卷 69-75页

作者： ZHANG Qingsong JI Tianjian XIAO Lei College of Civil Aviation Nanjing University of Aeronautics and AstronauticsNanjing 211106P.R.China

Due to the influence of the groundwater level,the internal humidity of the subgrade changes and the stability of the subgrade is affected. The main purpose of this paper is to obtain a reliable model of subgrade soil water content variation under the action of dry-wet cycle through sensor readings. Thus,an indoor soil column model test system is designed,and the readings of the sensors are used to determine the changing law of moisture field in the subgrade soil. The sensor readings indicate that the water content gradually decreases along the height of the soil column,and the water in the upper part of the soil column continuously loses,while the water in the lower part migrates upward to supplement. With the increase of dry-wet cycle index,the water holding capacity of soil decreases,and the soil surface gradually cracks and tends to rupture.

关键词： subgrade soil dry-wet cycle water content change soil column indoor test

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Rapid testing and prediction of soil–water characteristic curve of subgrade soils considering stress state and degree of compaction

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第12期15卷 3305-3315页

作者： Junhui Peng Huiren Hu Junhui Zhang National Engineering Research Center of Highway Maintenance Technology Changsha University of Science and TechnologyChangsha410114China

The subgrade soil is generally in saturated or unsaturated condition. To analyze complex thermo-hydro-mechanical-chemical (THMC) behaviors of subgrade, it is essential to determine the soil–water characteristic curve (SWCC) that represents the relationship between matric suction and moisture content. In this study, a full-automatic rapid stress-dependent SWCC pressure-plate extractor was developed. Then, the influences of overburden stress and degree of compaction on the SWCC of subgrade soil such as high liquid limit silt (MH) and low liquid limit clay (CL) were analyzed. Accordingly, a new model taking into account the influences of overburden stress and degree of compaction based on the well-known Van Genuchten (VG) SWCC fitting model was presented and validated. The results show that with the increase of the degree of compaction and overburden stress, the saturated moisture content of subgrade soil decreases, while the air-entry value increases and the transition section curve becomes flat. The influences of the degree of compaction and overburden stress on the SWCC of MH is greater than that of CL. Meanwhile, there was a satisfactory agreement between the prediction and measurement, indicating a good performance of the new model for predicting the SWCC.

关键词： subgrade soil soil–water characteristic curve(SWCC) Overburden stress Degree of compaction Prediction mode

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soil subgrade’s Characterization and Classification of Thies (Senegal, West Africa) on a Radius of 2.5 Kilometers along Five Roads

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Geomaterials 2016年第1期6卷 1-17页

作者： E.H.B.M. Niakhate Séni Tamba Makhaly Ba Adama Dione Issa Ndoye Laboratoire de Mécanique et Modélisation-UFR Sciences de l’Ingénieur Université de Thies Thies Sénégal Ecole Polytechnique de Thies (EPT/Thies) Thies Sénégal

This article explains the results of a study conducted on the characterizations of subgrade soils in the region of Thies. The road platforms are mainly composed of a background soil, which is generally overlapped by a surface layer that plays two roles. Firstly, it protects the soil structure, ensures the leveling, and facilitates the movement of vehicles. Secondly, it brings harmony in the mechanistic characteristics of the materials that compose the soil while improving the long-term life force. The methodology consisted in taking samples of subgrade soil along the roads all over the region of Thies in a 5 km diameter span. The identification tests allowed the Thies-Tivaoune, Thies-Khombole and Thies-Noto axes are characterized by tight sands, poorly graded size. While Thies Pout-axis is characteristic of severe solid particle size and spread well graded and serious to spread and well graded particle size. Finally the Thies-Montrolland axis is characterized by severe to very tight particle size and graduated to spread and serious and well graded particle size. The specific gravity values found Proctor test shows the presence of sand, sandy laterite and laterite. In the target area, polished soils of the A-3 type according to the AASHTO classification system are the most represented with 60%, followed by the A-2-6 type 25%, and the A-2-4 type with 9%, which are typical of gravel, clay, and silty sands. soils of the A-1-b type (2%) typical of roc fragments, sands and clay are also represented. Polished sands of the A-3 type have a better efficiency on road infrastructures than other types of soil listed above. Finally, we’ve also noted the presence of soils of the A-2-7 and A-4 types with the low percentage of 2%. subgrade soils of class S4 are the most represented with 58%, followed by those of class S5 with 42%. Samples of the Thies-Montrolland road have a claylike plasticity (CL or CH group), while those of the Thies-Pout road belong to the ML or OL and CL or OL

关键词： subgrade soil Mechanistic Pavement Design Arc GIS AASHTO CBR Resilient Modulus

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A Practical Model for Deformation Prediction of Highway subgrade soils

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Journal of Modern Transportation 2000年第1期17卷 13-24页

作者：邱延峻 NormanD.Dennis RobertP.Elliott School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China Department of Civil Engineering University of Arkansas Fayetteville AR 72701 U.S.A.

This paper reports a practical constitutive relation for highway subgrade soils. The proposed model is derived based on the laboratory repeated load testing of four subgrade soils. Statistical parameters generally used in the power model of subgrade permanent strain are expanded into material constants with engineering significance. The constitutional relation reported in this paper can be used in the mechanistic based pavement design of highway flexible pavements and railroad tracks.

关键词： constitutive relation subgrade soil pavement design

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Investigation on the properties of compacted silty clay subjected to electro-osmosis using bender element

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Research in Cold and Arid Regions 2023年第6期15卷 253-261页

作者： KangWei Tang Chuang Lin Hao Wang WeiJun Qin DeCheng Feng Feng Zhang School of Transportation Science and Engineering Harbin Institute of Technology73 Huanghe RoadHarbinHeilongjiang 150090China Laboratoire Navier/CERMES Ecole des Ponts ParisTech6 et 8 Avenue Blaise PascalCite DescartesChamps-sur-Marne77455 Marne La Vallee Cedex 2France Key Laboratory of Transportation Industry for Highway Construction and Maintenance Technology in Seasonal Frozen soil Areas(Changchun) 4887 Xinglong RoadChangchunJinlin 130102China

The moisture content of subgrade soil in seasonally frozen regions is often higher than its optimum value,leading to a decline in mechanical properties and a reduction in subgrade bearing ***-osmosis has shown promise as a technology for controlling subgrade moisture,but significant heterogeneity has also been observed in treated *** study investigates the impact of electro-osmosis on soil stiffness through a series of bender element tests of compacted *** effects of dry density and supply voltage on the performance of electroosmosis treatment and the layered structure and anisotropy of the soil were *** results show that electro-osmosis treatment increased the shear wave velocity of the soil by 140% compared to untreated saturated soil and by 70% compared to soil with optimum water *** has also been found that layered compaction of soil resulted in a layered structure,with electro-osmosis having a more prominent impact on soil near the cathode,resulting in a more pronounced layered ***,electro-osmosis was found to enhance soil anisotropy,particularly near the *** the dry density and voltage levels can help improve soil *** findings provide insights into the potential use of electro-osmosis in improving soil stiffness,which could benefit various engineering applications.

关键词： subgrade soil Electro-osmosis Bender element Layered structure Anisotropy

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