冻融循环对不同压实度下膨胀土力学特性影响的试验研究

doi:10.13722/j.cnki.jrme.2022.0767

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摘要冻融循环是北疆膨胀土力学性能劣化的主要因素之一。利用自行设计的单向环境边界加载装置，开展冻融循环下体积测量试验、无侧限抗压强度试验和扫描电镜试验，研究3种不同压实度(90%，95%和100%)下膨胀土体积变化和力学性质的变化特征，采用灰色关联度定量分析力学强度劣化与微观孔隙发育的演化规律，并探讨冻融循环下孔隙变化特征对土体无侧限抗压强度的影响。试验结果表明：试样的体积变化随压实度的增大逐渐由收缩变为膨胀；膨胀土的硬化特性随着压实度的增加而减弱，冻融循环促进了应力–应变关系的软化；第1次冻融循环导致试样的无侧限抗压强度显著下降，7次循环后衰减幅度为56.07%～67.54%；试样的破坏应变和弹性模量在冻融循环后都有不同程度的衰减；面孔隙率与无侧限抗压强度衰减率的相关性为0.779～0.882，对应的权重达到0.467～0.471，二者之间存在良好的线性关系。研究成果可为北疆膨胀土工程的建设与维护提供借鉴。

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	陈永1
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	黄英豪2
	王硕2
	蔡正银2
	穆彦虎3

关键词 ：土力学, 冻融循环, 膨胀土, 压实度, 体积变化, 力学性能, 孔隙参数

Abstract：Freeze-thaw cycles are an important reason for the deterioration of expansive soil mechanical properties in north Xinjiang. In this research，freeze-thaw cycle tests were carried out using a self-designed unidirectional environmental boundary loading device. On this basis，volume measurement，unconfined compressive strength，and scanning electron microscope tests were carried out. The characteristics of volume changes and mechanical properties of expansive soil at three different compaction degrees(90%，95% and 100%) were investigated. The evolution law of mechanical strength deterioration and microscopic pore development was quantitatively analyzed by grey relational analysis. The effect of pore change characteristics on the unconfined compressive strength of soil under freeze-thaw cycles was discussed. The tests results showed that the volume change of specimens gradually changed from shrinkage to swelling with the increased compaction degree. The hardening properties of expansive soils weakened with increasing compaction，and freeze-thaw cycles promoted the softening of stress-strain relationships. The unconfined compressive strength of the specimens was significantly reduced after the first freeze-thaw cycle，with attenuation amplitude from 56.07% to 67.54% after seven cycles. Freeze-thaw cycles also attenuated failure strain and resilient modulus to varying degrees. The correlation between the surface porosity and the unconfined compressive strength attenuation rate was 0.779–0.882，and the corresponding weight reached 0.467–0.471，with an excellent linear relationship. The study results provide a reference for constructing and maintaining expansive soil projects in north Xinjiang.

Key words： soil mechanics freeze-thaw cycle expansive soil compaction degree volume change behavior mechanical properties pore parameters

引用本文:

陈永1，2，黄英豪2，王硕2，蔡正银2，穆彦虎3. 冻融循环对不同压实度下膨胀土力学特性影响的试验研究[J]. 岩石力学与工程学报, 2023, 42(S2): 4299-4309.
CHEN Yong1，2，HUANG Yinghao2，WANG Shuo2，CAI Zhengyin2，MU Yanhu3. Effects of freeze-thaw cycles on mechanical properties of expansive soils at different compaction degrees. , 2023, 42(S2): 4299-4309.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0767 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS2/4299

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