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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摘要为解决高温地区土工格室加固粉质黏土路基易出现强度衰减、加筋失效等工程隐患，揭示温升对格室加固粉质黏土力学特性和加筋效果的影响，以粉质黏土和HDPE，PET，PP三种土工格室为研究对象，在20 ℃，50 ℃，70 ℃环境下开展土工格室力学性质试验和温控固结不排水三轴试验，建立并验证土体三轴剪切本构模型及Duncan-Chang参数，再利用格室加固本构模型分析不同温度下格室加固土力学特性。结果表明：（1）3种土工格室条带刚度、节点强度均与温度大小呈负相关性，其中HDPE土工格室温度敏感性最高。HDPE，PET和PP格室节点强度分别受制于剥离强度、剥离强度和对拉强度。（2）温升致使粉质黏土抗剪强度减小、孔隙水压力增加，使Duncan-Chang模型参数中初始切线模量K、破坏比Rf减小，模量指数n增大。（3）土工格室约束围压作用可显著提高粉质黏土强度，20 ℃时PET格室加筋效果最优，显著高于HDPE和PP；（4）温度变化下格室加固土复合体的力学性能由格室与土体温度耦合效应决定，温升会显著削弱格室加筋效果，其中HDPE受削弱程度最显著（71.43%～74.42%），其次为PP（20.07%～31.91%），PET受影响最小（4.97%～18.71%）。这主要是HDPE的线性饱和烷烃分子链在高温下运动加剧、材料易软化所致。研究成果可指导高温地区土工格室加固路基、边坡等工程的材料选型与结构设计，有效提升工程长期服役稳定性。

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	孙传迪1
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关键词 ：土力学, 道路工程, 土工格室, 粉质黏土, 温升作用, 加筋效果, 力学特性

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

引用本文:

孙传迪1，2，3，宋飞1，2，3*. 温升作用下土工格室加固粉质黏土力学性质研究[J]. 岩石力学与工程学报, 2026, 45(11): 3475-3488.
SUN Chuandi1, 2, 3, SONG Fei1, 2, 3*. Mechanical properties of silty clay reinforced by geocells under temperature rise. , 2026, 45(11): 3475-3488.

链接本文:

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

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