西藏普兰地区冰碛土力学特性试验研究

贾敏才; 郑一鸣; 黄金

doi:10.3969/j.issn.0258-2724.20240406

西藏普兰地区冰碛土力学特性试验研究

doi: 10.3969/j.issn.0258-2724.20240406

贾敏才^{1, 2,},
郑一鸣¹,
黄金³

1.
同济大学土木工程学院，上海 200092
2.
同济大学岩土及地下工程教育部重点实验室，上海 200092
3.
民航机场建设集团西南设计研究院有限公司，四川成都 610202

详细信息

作者简介:
贾敏才（1973—），男，副教授，研究方向为地基处理与离散元模拟，E-mail：mincai_jia@tongji.edu.cn

中图分类号: TU441
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出版历程
- 收稿日期: 2024-08-13
- 修回日期: 2024-11-27
- 网络出版日期: 2025-04-17

Research on Mechanical Properties of Glacial Tills in Purang Region of Xizang

1.
College of Civil Engineering, Tongji University, Shanghai 200092, China
2.
Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China
3.
CACC Southwest Design and Research Institute Co., Ltd., Chengdu 610202, China

摘要

摘要:
为揭示西藏普兰地区冰碛土的力学行为，对天然状态表层冰碛土开展法向压力为100～400 kPa的现场直剪试验，对96%压实度冰碛土开展法向压力为100～400 kPa的室内大型直剪试验及围压为100～400 kPa的室内大型三轴试验. 试验结果表明：西藏普兰地区冰碛土91.7%压实度的天然状态下内聚力为11.0 kPa，内摩擦角为41.0°；在96%压实度时，内聚力为9.4～11.2 kPa，内摩擦角在45.3°～46.7°，且室内大型三轴试验所得强度参数高于大型直剪试验；96%压实度下冰碛土峰值强度高于天然状态，但初始阶段模量小于天然状态冰碛土；各级围压下，冰碛土应力-应变曲线均呈现软化特性，峰值应变随围压的增加先增大后减小；修正的邓肯-张模型可以较好地描述冰碛土偏应力与轴向应变关系，并体现普兰地区冰碛土的应变软化特性.
- 冰碛土 /
- 力学特性 /
- 压实度 /
- 抗剪强度
Abstract:
To reveal the mechanical properties of glacial tills in the Purang region of Xizang, in-situ direct shear tests with normal pressures from 100 kPa to 400 kPa were carried out on surface glacial tills in a natural state, and laboratory large-scale direct shear tests with normal pressures from 100 kPa to 400 kPa and large-scale triaxial tests with confining pressures from 100 kPa to 400 kPa were carried out on glacial tills with the compaction degree of 96%. The results show that the cohesion of surface glacial tills with a compaction degree of 91.7% is 11.0 kPa, and the internal angle of friction is 41.0°. The cohesion of glacial tills with a compaction degree of 96% is between 9.4 kPa and 11.2 kPa; the internal angle of friction is between 45.3° and 46.7°; the strength parameters obtained from laboratory large-scale triaxial tests are higher than those from large-scale direct shear tests. The peak strengths of glacial tills with a compaction degree of 96% are higher than those in a natural state, but the initial moduli are lower than those in a natural state. The stress–strain curve of glacial tills exhibits softening characteristics under various confining pressures, and the peak strain shows a trend of an increase followed by a decrease with the increase of confining pressures. The modified Duncan-Chang model can well describe the relationship between deviatoric stress and axial strain of glacial tills and reflect the strain softening characteristics of glacial tills in the Purang region.
- glacial till /
- mechanical property /
- compaction degree /
- shear strength

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图 1 现场冰碛土级配曲线

Figure 1. Gradation curve of in-situ glacial tills

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图 2 试验土样级配曲线

Figure 2. Gradation curves of test soil

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图 3 大型三轴仪

Figure 3. Large-scale triaxial apparatus

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图 4 现场直剪试验结果

Figure 4. Results of in-situ direct shear tests

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图 5 大型直剪试验结束试样形态

Figure 5. Samples after large-scale direct shear tests

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图 6 室内大型直剪试验结果

Figure 6. Results of laboratory large-scale direct shear tests

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图 7 大型三轴压缩结束部分试样形态

Figure 7. Samples after large-scale triaxial compression

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图 8 室内大型三轴试验结果

Figure 8. Results of laboratory large-scale triaxial tests

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图 9 现场直剪与室内大型直剪试验结果对比

Figure 9. Comparison of in-situ and laboratory large-scale direct shear test results

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图 10 室内大型三轴与大型直剪试验结果对比

Figure 10. Comparison of laboratory large-scale triaxial and direct shear test results

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图 11 邓肯-张模型拟合结果

Figure 11. Fitting results of Duncan-Chang model

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图 12 修正的邓肯-张模型拟合结果

Figure 12. Fitting results of modified Duncan-Chang model

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表 1 各地区冰碛土强度参数

Table 1. Strength parameters of glacial tills in different regions

地区	试验类型	试样状态	土体内聚力/kPa	土体内摩擦角/（°）
西藏普兰地区	现场直剪试验	天然状态（91.7% 压实度）	11.0	41.0
西藏普兰地区	室内大型直剪试验	重塑土（96.0% 压实度）	9.4	45.3
西藏普兰地区	室内大型三轴试验	重塑土（96.0% 压实度）	11.2	46.7
西藏林芝市^[1]	室内大型三轴试验	重塑土	27.0	33.8
云南省丽江市^[15]	室内大型直剪试验	原状土	32.6	39.3
云南省丽江市^[15]	室内大型直剪试验	重塑土	35.9	30.0
四川省甘孜州^[18]	现场直剪试验	天然状态	52.8	30.3

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西藏普兰地区冰碛土力学特性试验研究

doi: 10.3969/j.issn.0258-2724.20240406

作者简介: 贾敏才（1973—），男，副教授，研究方向为地基处理与离散元模拟，E-mail：mincai_jia@tongji.edu.cn

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出版历程

Research on Mechanical Properties of Glacial Tills in Purang Region of Xizang

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出版历程

目录

作者简介:
贾敏才（1973—），男，副教授，研究方向为地基处理与离散元模拟，E-mail：mincai_jia@tongji.edu.cn