温升作用下土工格室加固粉质黏土力学性质研究

doi:10.3724/1000-6915.jrme.2026.0041

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Abstract To address engineering hazards such as strength degradation and reinforcement failure commonly observed in geocell-reinforced silty-clay subgrades in high-temperature regions, this study investigates the effects of temperature rise on the mechanical properties and reinforcement performance of geocell-reinforced silty clay. Silty clay and three types of geocells—high-density polyethylene (HDPE), polyethylene terephthalate (PET), and polypropylene (PP)—were used as test materials. Geocell mechanical tests and temperature-controlled consolidated-undrained triaxial tests were conducted at 20 ℃, 50 ℃ and 70 ℃. A triaxial shear constitutive model for silty clay was established and calibrated using Duncan-Chang parameters. The mechanical behavior of geocell-reinforced soil at different temperatures was further analyzed using the reinforced-soil constitutive model. The results indicate that: (1) the strip stiffness and joint strength of all three geocells are negatively correlated with temperature, with HDPE geocells exhibiting the greatest temperature sensitivity. The joint strengths of HDPE and PET geocells are governed by peel strength, whereas that of PP geocells is controlled by pull-out strength; (2) increasing temperature reduces the shear strength of silty clay, increases pore-water pressure, decreases the initial tangent modulus K and failure ratio Rf, and increases the modulus exponent n in the Duncan-Chang model; (3) the confining pressure induced by the geocells significantly enhances the strength of silty clay. At 20 ℃, PET geocells provide the most effective reinforcement, substantially outperforming HDPE and PP geocells; and (4) the mechanical behavior of geocell-reinforced soil composites at different temperatures is governed by the thermomechanical coupling between the geocell and the soil. Increasing temperature markedly reduces reinforcement efficiency, with the greatest reduction observed for HDPE geocells (71.43%–74.42%), followed by PP geocells (20.07%–31.91%), whereas PET geocells are the least affected (4.97%–18.71%). This behavior is attributed to the intensified movement of the linear saturated hydrocarbon chains in HDPE at elevated temperatures, which promotes material softening. These findings provide guidance for the material selection and structural design of geocell-reinforced subgrades and slopes in high-temperature regions and can effectively improve the long-term service stability of engineering structures.

Key words： soil mechanics highway engineering geocell silty clay temperature rise reinforcement performance mechanical property

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	SUN Chuandi1
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	SONG Fei1
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Cite this article:

SUN Chuandi1,2,3, et al. Mechanical properties of silty clay reinforced by geocells under temperature rise[J]. , 2026, 45(11): 3475-3488.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2026.0041 OR https://rockmech.whrsm.ac.cn/EN/Y2026/V45/I11/3475

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