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为了研究冻融循环对固化灰渣土的动力特性影响，制备固化灰渣土试样，分别开展了0～5次冻融循环条件下的动三轴试验，并利用扫描电镜对冻融循环后的固化灰渣土试样进行微观分析。试验结果表明：冻融循环后固化灰渣土试样的累积塑性应变随着振动次数的增加而增长；应力幅值越大，其累积塑性应变也越大。固化灰渣土的阻尼比随着振动次数的增加而减小，振动荷载频率越高，阻尼比越小；在应力幅值0.2 MPa时，冻融次数从0增加到5次，试样的最大阻尼比增加33.5%,初始动弹性模量减小42%。对冻融循环次数和固化灰渣土相对阻尼比的数据进行拟合，建立了固化灰渣土的阻尼比的双曲线模型。由扫描电镜微观试验可以看出：高分子固化剂可以明显改善土体致密性，反应产生更多水化产物；多次冻融循环后，土体结构较为松散，内部出现许多裂缝和孔隙，固化灰渣土的强度特性有所衰减。
Abstract：In order to study the influence of freeze-thaw cycles on the dynamic characteristics of the solidified ash soil, the solidified ash soil samples were prepared and subjected to dynamic triaxial tests under 0～5 freeze-thaw cycles. Scanning electron microscopy was used to conduct microscopic analysis of the solidified ash soil samples after freeze-thaw cycles. The experimental results show that the cumulative plastic strain of solidified ash soil samples after freeze-thaw cycles increases with the increase of vibration frequency; the larger the stress amplitude, the greater the accumulated plastic strain. The damping ratio of solidified ash soil decreases with the increase of vibration frequency, and the higher the frequency of vibration load, the smaller the damping ratio; when the stress amplitude is 0.2 MPa, and the number of freeze-thaw cycles increases from 0 to 5, the maximum damping ratio of the samples increases by 33.5%, and the initial dynamic elastic modulus decreases by 42%. A hyperbolic model for the damping ratio of solidified ash soil is established by fitting the data on the number of freeze-thaw cycles and the relative damping ratio of solidified ash soil. From the microscopic tests of scanning electron microscopy, it can be seen that the polymer curing agents can significantly improve the compactness of soil and produce more hydration products in the reaction; after multiple freeze-thaw cycles, the soil structure becomes relatively loose, with many cracks and pores appearing inside, and the strength characteristics of the solidified ash soil are weakened.
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基本信息:
DOI：10.26923/j.gckc.2026.06.001
中图分类号:TU43
引用信息:
[1]王越,刘干斌,钱锋,等.冻融循环后固化灰渣土的动力特性研究[J].工程勘察,2026,54(06):1-7.DOI:10.26923/j.gckc.2026.06.001.
基金信息:
国家自然科学基金项目(51778303)
2026-06-01
2026-06-01