| 高铁路基粗粒土填料静力特性大型三轴试验研究 |
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| 引用本文： | 吕玺琳,晏友波,马一跃,章澎.高铁路基粗粒土填料静力特性大型三轴试验研究[J].路基工程,2022,0(1):39-43. |
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| 作者姓名： | 吕玺琳 晏友波 马一跃 章澎 |
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| 作者单位： | 1.同济大学岩土及地下工程教育部重点试验室，上海 200092 |
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| 基金项目： | 国家重点基础研究发展计划（973计划）青年科学家专题项目资助(2014CB049100) |
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| 摘 要： | 选取宁杭高铁德清站路基填料站现场典型粗粒土填料制备试样，在100，150，200，300 kPa围压下开展大型三轴固结排水剪切试验，得到相应的应力-应变和体变特性曲线。试验表明:围压越大，偏应力达到稳定值所需的轴向应变越大，当围压为300 kPa、轴向应变达到15 %时，偏应力仍在继续增长。不同围压条件下的试样剪切初期均表现为剪缩，随着轴向应变增加，体积应变逐渐减小甚至过渡到剪胀。根据试验结果，选取不同围压下的峰值强度作为归一化因子，对填料的应力-应变关系进行理论分析，得到归一化偏应力与轴向应变的拟合关系曲线。由该曲线确定相关参数后，能较好地预测填料的应力-应变关系。
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| 关 键 词： | 高铁路基填料 粗粒土 大三轴剪切试验 强度 应力-应变关系 |
| 收稿时间： | 2021-03-10 |
Study on Large Scale Triaxial Test on the Static Characteristics of Coarse Grained Soil Filling for High-speed Railway Subgrade |
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| Abstract: | The typical field grained soil filling for high-speed railway embankment at the roadbed filling station of Deqing Station of Nanjing—Hangzhou Highway was selected to prepare samples, and large-scale triaxial consolidation drained shear tests were carried out under different confining pressures of 100, 150, 200, 300 kPa, and the corresponding stress-strain and volume strain characteristic curves were obtained. The test results showed that the larger the confining pressure is, the larger the axial strain required for the deviatoric stress to be stable. When the confining pressure is 300 kPa, the deviatoric stress still increases when the axial strain reaches 15 %. Under different confining pressures condition, specimen shows shear shrinkage at the initial shearing stage, with the increase of axial strain, the volume strain gradually decreases and even transits to shear dilatancy. According to the triaxial test results, the peak strength under different confining pressures was taken as the normalization factor to analyze the stress-strain relationship of the filling. The fitting curve between the normalized deviatoric stress and the axial strain was obtained. After determining the relevant parameters from the curve, the stress-strain relationship of the filling can be well predicted. |
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