升降温作用对黏性土剪切特性影响的试验研究

丁诗佳; 张哲安; 费康

doi:10.11779/CJGE2023S10001

升降温作用对黏性土剪切特性影响的试验研究 English Version

扬州大学岩土工程研究所, 江苏扬州 225127

基金项目:

国家自然科学基金项目 51778557

详细信息

作者简介:
丁诗佳(1997—)，男，硕士，主要从事地基基础等方面的科研工作。E-mail: jwj2035@163.com

中图分类号: TU432
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- 文章访问数: 145
- HTML全文浏览量: 29
- PDF下载量: 37
出版历程
- 收稿日期: 2023-07-04
- 网络出版日期: 2023-11-23
- 刊出日期: 2023-10-31

Experimental study on effects of heating-cooling cycles on shear characteristics of clay

Institute of Geotechnical Engineering, Yangzhou University, Yangzhou 225127, China

摘要

摘要: 采用温控三轴仪，对升降温作用后的正常固结饱和黏土进行了固结不排水剪切试验，研究了升降温作用对土体强度、有效应力路径、超孔压等的影响。结果表明，在100，200，400 kPa固结围压下，土样在升降温作用后呈现出类似超固结土的特性，固结不排水剪切强度分别提高了25.8%，22.1%，14.8%。强度的变化主要表现为黏聚力的提高，临界摩擦角基本保持不变。对比室温下不同超固结比（OCR）土样的固结不排水剪切试验结果，发现升降温作用后土样的峰值强度与OCR=1.5的土样相近，但升降温作用过程中产生的塑性体积应变增量远小于力学加-卸载所产生的，表明升降温作用对土体的硬化作用与超固结土的体积硬化机理有所区别。
- 黏土 /
- 升降温 /
- 三轴试验 /
- 剪切特性
Abstract: The consolidated undrained shear tests on the normally consolidated saturated clay after heating-cooling are carried out by using the temperature-controlled triaxial apparatus. The effects of the heating-cooling on the soil strength, effective stress path and excess pore pressure are studied. The results show that under the confining pressures of 100, 200, 400 kPa, the soil samples exhibit similar characteristics to those of the overconsolidated soil after heating-cooling, and the consolidated undrained shear strength increases by 25.8%, 22.1% and 14.8%, respectively. The change of strength mainly shows the improvement of cohesion, and the critical friction angle basically remains unchanged. By comparing the consolidated undrained shear test results of the soil samples with different OCRs at room temperature, it is found that the peak strength of the soil samples after heating-cooling is similar to that when OCR=1.5, but the increment of plastic volumetric strain generated during heating-cooling is much smaller than that generated by mechanical loading and unloading, which indicates that the hardening effects of heating-cooling on soil are different from the volumetric hardening mechanism of the overconsolidated soil.
- clay /
- heating-cooling /
- triaxial test /
- shear characteristic

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图 1 偏应力-轴向应变曲线

Figure 1. Curves of deviatoric stress-axial strain

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图 2 超孔压-轴向应变曲线

Figure 2. Curves of excess pore water pressure-axial strain

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图 3 有效应力路径

Figure 3. Effective stress paths

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图 4 偏应力-轴向应变曲线

Figure 4. Curves of deviatoric stress-axial strain

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图 5 超孔压-轴向应变曲线

Figure 5. Curves of excess pore water pressure-axial strain

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表 1 试验方案

Table 1 Test plan

试验编号	超固结比	温度历史/℃	有效围压/kPa
NN100	1	25	100
NN200	1	25	200
NN400	1	25	400
NC100	1	25→65→25	100
NC200	1	25→65→25	200
NC400	1	25→65→25	400
ON11	1.13	25	200→225→200
ON12	1.25	25	200→250→200
ON13	1.5	25	200→300→200
ON14	2	25	200→400→200
注：NN为正常固结土室温下的三轴试验，NC为正常固结土升降温作用下的三轴试验, ON为超固结土室温下的三轴试验。

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参考文献(10)

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