| 不同压实度下路基土抗剪强度参数和CBR试验研究 |
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| 引用本文： | 成正伟,高启聚.不同压实度下路基土抗剪强度参数和CBR试验研究[J].路基工程,2022,0(5):70-75. |
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| 作者姓名： | 成正伟 高启聚 |
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| 作者单位： | 1.苏州科技大学土木工程学院，江苏苏州 215000 |
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| 基金项目： | 国家自然科学基金项目（51478288） |
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| 摘 要： | 为了研究压实度对路基土抗剪强度参数和加州承载比（CBR）的影响，选取粉土、砂土和黏土三种类型的路基土，分别进行击实试验、不同压实度下的直接剪切试验和CBR试验。结果表明:压实度对路基土的内摩擦角、黏聚力和CBR值影响显著，且均具有较好的相关性。在此基础上，以塑性指数表征路基土的类型，最佳含水率和最大干密度表征路基土的物理状态，以压实度为主要影响因素，建立了路基土的抗剪强度参数和CBR值预估模型，建立的预估模型不仅精度较高，而且具有普遍适用性，可为公路路基的设计与施工提供参考。
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| 关 键 词： | 路基土 压实度 内摩擦角 黏聚力 CBR 预估模型 |
| 收稿时间： | 2021-11-09 |
Experimental Study on Shear Strength Parameter and CBR of Subgrade Soils under Different Compaction |
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| Abstract: | In order to study the effect of compaction degree on shear strength parameters and California bearing ratio (CBR) of subgrade soil, three subgrade soil types, silt, sand and clay are selected to carry out compaction test, direct shear test and CBR test under different compaction degrees respectively. The results show that the compaction degree has a significant effect on the internal friction angle, cohesion and CBR values of subgrade soil, and has a good correlation. Based on this, plastic index is used to indicate subgrade soil types, the optimum moisture content and maximum dry density are adopted to characterize the physical state of subgrade soil, the subgrade soil shear strength parameters and the CBR value forecast model has been established with the degree of compaction as the main influence factors. The model has not only high precision, but also universal applicability, which can provide reference for design and construction of highway subgrade. |
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