| 花岗岩全风化土湿化变形及强度的试验研究 |
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| 引用本文： | 刘翔,陈国兴,孙田.花岗岩全风化土湿化变形及强度的试验研究[J].岩土力学,2012,33(11):3313-3317. |
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| 作者姓名： | 刘翔 陈国兴 孙田 |
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| 作者单位： | 1. 南京工业大学 岩土工程研究所，南京 210009；2. 南京工业大学 江苏省土木工程防震技术研究中心，南京 210009 |
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| 摘 要： | 基于某高速公路路基花岗岩全风化土浸水湿化的情况，采用GDS非饱和三轴仪进行了接近实际应力路径下三轴“单线法”湿化变形试验，研究了试样在不同围压、不同湿化应力水平下的湿化情况，得到了试样在湿化前后应力-应变曲线，轴变与体变间的变化规律，经成果分析表明，试样在湿化过程中均产生了轴变与体变，并且经湿化变形后产生了各向异性。当初始有效围压相同时，各湿化应力水平下的抗剪强度指标c、? 值近似相等，与干样相比，湿样的黏聚力c值减少明显，内摩擦角? 值变化不大。在初始有效围压较低情况下，试样约在轴向应变达10%左右时体积变形由剪缩变为剪胀，而在初始有效围压较高的情况下则没发生类似的现象。
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| 关 键 词： | 花岗岩风化土 湿化变形 抗剪强度 |
| 收稿时间： | 2012-07-12 |
Experimental research on wetting deformation and strength of weathered granite |
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| LIU Xiang
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CHEN Guo-xing
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SUN Tian.Experimental research on wetting deformation and strength of weathered granite[J].Rock and Soil Mechanics,2012,33(11):3313-3317. |
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| Authors: | LIU Xiang CHEN Guo-xing SUN Tian |
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| Institution: | 1. Institute of Geotechnical Engineering, Nanjing University of Technology, Nanjing 210009, China; 2. Civil Engineering & Earthquake Disaster Prevention Center of Jiangsu Province, Nanjing University of Technology, Nanjing 210009, China |
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| Abstract: | Based on the condition of one selected weathered granite obtained from the subgrade of expressway, “single line” wetting deformation test is conducted by applying the GDS unsaturated triaxial apparatus, in which the stress path of weathered soil is close to the actual one. During the test, the wetting behaviors of the weathered soil under various confining pressures and stress levels are investigated. The data collection throughout the whole experiment includes the stress-strain curves and the axial strain-volume strain curves of the weathered soil before and after the wetting test. The results show that there are axial strain and volume strain in the process of wetting; moreover, the anisotropy occurs after the wetting deformation. When under the same initial effective confining pressure, the shear strength indices c and ? are similar at different wetting stress levels. Compared with the dry sample, the cohesion of wet sample reduces significantly; however, the internal frictional angle has little change. Under a lower initial effective confining pressure, the volume deformation of the sample changes from shear shrinkage to shear dilatation when the axial strain reaches about 10%. However, the similar phenomenon does not appear under a higher initial effective confining pressure. |
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| Keywords: | weathered granite wetting deformation shear strength |
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