Strength and micromechanism of improved silt under freeze-thaw cycle effect

TAN Yun-zhi; WU Pian; FU Wei; WAN Zhi; ZHANG Hua; ZHANG Zhen-hua

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Strength and micromechanism of improved silt under freeze-thaw cycle effect

更新时间：2026-06-25

- Strength and micromechanism of improved silt under freeze-thaw cycle effect
- Vol. 34, Issue 10, (2013)
- 作者机构：
  
  1. 三峡大学三峡库区地质灾害教育部重点实验室,湖北,宜昌,443002
  2. 中交第二公路勘察设计研究院有限公司,武汉,430056
  3. 湖南省交通科学研究院,长沙,410015
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU111.2+5
- Online First：18 October 2013，
  
  Published：2013
- 稿件说明：
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TAN Yun-zhi, WU Pian, FU Wei, et al. Strength and micromechanism of improved silt under freeze-thaw cycle effect[J]. 2013, 34(10).
DOI：

TAN Yun-zhi, WU Pian, FU Wei, et al. Strength and micromechanism of improved silt under freeze-thaw cycle effect[J]. 2013, 34(10). DOI：

摘要

为了研究冻融循环对改良粉土强度的影响规律及其作用机制，开展了不同初始压实度和初始含水率试样的冻融循环试验。对经历不同冻融循环次数作用后的试样进行无侧限抗压强度试验，探讨了冻融循环作用对改良粉土的长期强度的影响规律。试验结果表明，随着冻融循环次数增加，改良粉土的抗压强度下降，最终在6次冻融循环后趋于稳定；相同的冻融循环次数条件下，初始含水率越大，改良粉土的抗压强度衰减幅度越大。为了寻找冻融循环作用对改良粉土孔隙结构的影响规律，进而揭示冻融循环对试样结构损伤的机制，开展了改良粉土的细观孔隙结构试验。试验结果表明，不同的冻融循环次数和初始含水率对小孔径孔隙（ 10 nm）之间的结构影响不大；冻融循环作用主要损伤了大孔径孔隙（0.01～100 μm）之间的结构，从而降低了改良粉土的强度。

Abstract

The freeze-thaw cycle tests are carried out under different compacted degrees and initial moisture contents to explore the mechanism and the influence of the long-term strength of improved silt under freeze-thaw cycle effect. And then

unconfined compressive strength tests after different freeze-thaw cycles are conducted. The influence law of the long-term strength of improved silt subjected to freeze-thaw cycle effect is discussed. It is found that the unconfined compressive strength decreases with the number of freeze-thaw cycles increasing. Finally

it reaches a stable stage after 6 freeze-thaw cycles. The higher initial moisture is

the more attenuation amplitude of the compressive strength is after the same number of the freeze-thaw cycles. In order to find out the influence law of the microscopic structure under the effect of freeze-thaw cycles

the microscopic tests of improved silt are carried out. And then the damage mechanism of the microscopic structure under the effect of freeze-thaw cycles is found out. It shows that different numbers of freeze-thaw cycles and initial moisture contents have less effect on the small pores ( 10 nm). Freeze-thaw cycles have main influence on the large pores (0.01～100 μm) between the soil aggregates

so it makes the strength of improved silt decreased.

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