Large-scale field creep tests on moraine soil
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摘要: 雅康高速公路兴康特大桥康定岸为巨厚层冰碛土，为研究冰碛土蠕变特性，采用自主研发的电气液伺服联控野外岩土力学试验装置开展现场米级大尺寸蠕变试验，实现了全过程的荷载伺服与数据自动采集。通过在现场开展常规直剪试验和直剪蠕变试验，获得了冰碛土的峰值强度参数和长期强度参数。根据现场压缩蠕变试验结果，分析了每级荷载下沉降变形的蠕变变形规律并获得了冰碛土压缩蠕变模型。研究表明：冰碛土瞬态蠕变持续时间不超过5 min，且具有加载后延迟变形的现象；减速蠕变阶段蠕变速率呈波动性下降；稳态蠕变阶段往往表现波动增长和收敛特征，反映了土体骨架颗粒的变形调整作用。Abstract: The sediment of the Kangding Bank of Xingkkang Bridge of Sichuan-Tibet Expressway is mostly consisted of very thick moraine soil. In order to study the creep characteristics of the moraine soil, the large-scale field creep tests in meters are carried out using the self-developed electric-gas-liquid servo joint control geotechnical mechanics test devices, and the load servo control and the data automatically collected in the whole process are successfully achieved. The peak strength parameters and long-term strength parameters of the moraine soil are obtained by conducting the conventional direct shear tests and shear creep tests in the field. The creep deformation laws and the revelant creep model for settlement deformation under each load are obtained by analyzing the results of the field compression creep test. The study shows that the duration of transient creep is less than 5 min. In addition, the transient creep is characterized by the delayed deformation after loading, and the creep rate fluctuantly decreases in the decelerating creep stage. In addition, the creep rate exhibits a raising curve with fluctuation in the steady creep stage, which indicates the deformation-adjusting effects of soil skeleton particles.
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Keywords:
- moraine soil /
- creep test /
- long-term strength
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表 1 抗剪试验强度参数
Table 1 Strength parameters of shear creep
常规直剪试验 直剪蠕变试验 峰值强度参数 蠕变强度参数 长期强度参数 f′ c′/kPa fC cC/kPa f∞ c∞/kPa 0.765 64.2 0.731 56.2 0.612 27.6 
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