New insights into the frost heave behavior of coarse grained soils for high-speed railway roadbed: Clustering effect of fines

She, Wei; Wei, Luansu; Guo-fan, Zhao; Yang, Guotao; Jiang, Jinyang; Hong, Jinxiang

doi:10.1016/j.coldregions.2019.102863

Cited by 16 publications

(5 citation statements)

References 15 publications

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“…For the fine particle matrix with strong water holding capacity, the clustering phenomenon should be more obvious during freeze–thaw process. Previous research has supported above conjecture to some extent 39 , 49 . The pores formed by the coarse and fine matrix skeleton were filled with the cluster body, which improved the resistance to deformation of the specimen.…”

Section: Discussionmentioning

confidence: 56%

A long term resilient modulus rate dependent model for coarse fine mixtures geomaterials under freezing and thawing cyclic

Wang

Tang

Tian

et al. 2022

Sci Rep

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The cyclic loading frequency (fcyc) effects on the resilient modulus (Mr) of freezing–thawing coarse–fine mixtures geomaterials (FTCFG) have always been a research hotspot. A series of long-term cyclic triaxial tests were conducted on FTCFG having different fines content (FC) under different number of freeze–thaw cycles (NFT) to investigate the effect of fcyc and deviator stress amplitude (qcyc) on the Mr of FTCFG. The freezing–thawing cyclic was found to improve the Mr of FTCFG. Additionally, Mr of FTCFG shown an obviously rate-dependent characteristics. Then three kinetic effects (rate effect, piston effect, and fatigue effect) are discussed in systemically which are related to qcyc, fcyc and moisture holding capacity (wh). Finally, a rate dependent model of long-term resilient modulus was developed to predict FTCFG materials’ resilient moduli as a function of qcyc, fcyc and wh. The comparisons between the calculation and experimental results reveal that the present model describes the Mr of FTCFG well.

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Section: Discussionmentioning

confidence: 56%

A long term resilient modulus rate dependent model for coarse fine mixtures geomaterials under freezing and thawing cyclic

Wang

Tang

Tian

et al. 2022

Sci Rep

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“…The model adopted unstructured tetrahedron mesh with a side length of 0.5 m. Hydrothermal processes upon freezing and thawing were simulated. As for the thermal boundary conditions, the bottom boundary was set to a constant temperature of 7 • C, both sides of the boundary were adiabatic, and the upper boundary was set to the Dirichlet thermal boundary condition, as shown in Equation (5). The lengths of the heat pump's heating section and heat collection section were 3.5 and 7.0 m, respectively, and the heating capacity was proportionally scaled, with reference to the prototype used in Section 3.1.…”

Section: Computational Modelmentioning

confidence: 99%

“…An effective method for reducing frost-heaving-induced damage is to modify the frost-heaving susceptibility of the subgrade fills within the freezing depth, by altering essential factors such as soil property, temperature, and moisture content [4,5]. According to the frost heave monitoring of the coarse-grained fillings of the Harbin-Dalian highspeed railway subgrade [6], an evident frost heave deformation was predicted in the first protective layer, with asphalt concrete and well-graded gravel, and the second protective layer, with A/B group fillings, both of which were insensitive to frost heave because of their high porosity and weak hydrophilic performance.…”

Section: Introductionmentioning

confidence: 99%

The Development of a Novel Direct-Expansion Ground Source Heat Pump (DE-GSHP) for Embankment Heating in Cold Regions

Cao,

Zhang,

2023

Applied Sciences

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This study aimed to investigate the practical applications of a ground source heat pump (GSHP) system for heating applications in embankment engineering. A special direct-expansion GSHP (DE-GSHP) was designed and manufactured, and its performance was experimentally assessed. Subsequently, the newly developed DE-GSHP structure demonstrated an excellent heating performance with respect to positive heat-supplying temperatures in cold regions. The temperature could be automatically controlled at 30, 45, 60, and 75; additionally, the heat-absorbing temperatures were maintained below 0 °C, which was extremely lower than that of the deep frost-free stratum. Further, the experimental data were used to evaluate the coefficient of performance of the DE-GSHP, which was more than 3.5. The findings indicated that the GSHP has potential applications for embankment heating in cold regions.

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“…Fine-grained cohesive soil should be stabilised before its use in construction work (Dahlin et al, 1999;She et al, 2019;Lindh, 2004;Zhou et al, 2017;Lemenkov and Lemenkova, 2021a). Stabilisation improves the engineering properties of finegrained soil by increasing its compressive strength (Brencich et al, 2021;Lemenkov and Lemenkova, 2021b;Wu et al, 2021), reducing its plasticity (Kasprzhitskii et al, 2016) and shrinkswell potential (Chen et al, 2002;Saride et al, 2013), and im-proving its mineralogical, morphological and structural characteristics (James, 2020;Wang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Hardening Accelerators (X-Seed 100 BASF, PCC, LKD and SALT) as Strength-Enhancing Admixture Solutions for Soil Stabilization

Lindh

Lemenkova

2023

Slovak Journal of Civil Engineering

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This study is aimed at evaluating the strength of stabilised soil collected from the Port of Norvik, Stockholm, Sweden, where 350,000 m3 of clay had to be stabilized. The tests were performed in the laboratory of the Swedish Geotechnical Institute (SGI). The soil was stabilised by binder mixtures using Portland cement clinker (PCC) and lime and lime kiln dust (LKD). Accelerators (X-seed 100 BASF, PCC, LKD and salt) were added to the soil samples for quicker stabilization. The strength of the stabilised soil was assessed using resonance frequency measurements of seismic P-waves by an ICP accelerometer in order to estimate the shear strength of the soil and to evaluate the effects from the accelerators, binder ratios, and the curing temperature on the gains in stabilization and strength. Various proportions of the binders were tested, i.e.: 50/50 cement/lime and 50/50 PCC/lime. The temperature was measured using a calorimeter in double experiments. The results showed that the accelerators improve the strength in the stabilized specimens and enhance the soil performance for engineering construction work.

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New insights into the frost heave behavior of coarse grained soils for high-speed railway roadbed: Clustering effect of fines

Cited by 16 publications

References 15 publications

A long term resilient modulus rate dependent model for coarse fine mixtures geomaterials under freezing and thawing cyclic

A long term resilient modulus rate dependent model for coarse fine mixtures geomaterials under freezing and thawing cyclic

The Development of a Novel Direct-Expansion Ground Source Heat Pump (DE-GSHP) for Embankment Heating in Cold Regions

Hardening Accelerators (X-Seed 100 BASF, PCC, LKD and SALT) as Strength-Enhancing Admixture Solutions for Soil Stabilization

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