| 三峡库区滑带土抗剪强度参数的影响因素研究 |
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| 引用本文： | 李维树,邬爱清,丁秀丽.三峡库区滑带土抗剪强度参数的影响因素研究[J].岩土力学,2006,27(1):56-60. |
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| 作者姓名： | 李维树 邬爱清 丁秀丽 |
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| 作者单位： | 长江科学院,岩基研究所,武汉,430010 |
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| 基金项目： | 水利部科技创新项目;引进国际先进农业科技计划(948计划) |
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| 摘 要： | 针对三峡库区滑带（体）土的多样性和复杂性及其抗剪强度参数的离散性，对影响滑带抗剪强度参数的主要因素进行了试验研究，这些主要因素有试点的地质代表性、试验尺寸、试验数量、应力大小、含水率及剪切面的形态等，尤其是性状不均匀的粉质粘土和碎石土，这些因素的影响更大。滑带性状在不同的部位是变化的，试点部位的选择直接影响参数的代表性，应根据剪切面的性状结合滑带的主要特征确定具有具有代表性的参数；对性状接近的滑带土进行了两种面积不同的比较试验，剪切面积宜大于2 500 cm2，否则，c, ? 值有较大的离散性；在同一场地进行3组且每组5～6点的对比试验，根据1组6点不同正应力的组合得出的c, ? 值最大相差0.5～1.0倍，说明1组试验的数量不宜少于5点；不同饱水状态的对比试验说明，含水率越大，c, ? 值越低；正应力大小及其在各个试点上的分布应结合滑带的性状及滑带的埋深合理选择；对于性状不均匀的粉质粘土和碎石土，碎石含量和粒径大小在剪切面上的分布对c, ? 值的影响也十分显著。因此，应在规程规范的基础上结合工程特点和滑带的环境条件制定合适的试验方案，尽可能减小误差，还应结合滑带的宏观特征及试点实际情况进行综合分析，提出具有代表性的参数建议值。
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| 关 键 词： | 三峡库区 滑带土 抗剪强度参数 影响因素 |
| 文章编号： | 1000-7598-（2006）01-0056-05 |
| 收稿时间： | 2004-10-12 |
| 修稿时间： | 2004-10-12 |
Study on influencing factors of shear strength parameters of slide zone clay in Three Gorges Reservoir area |
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| LI Wei-shu,WU Ai-qing,DING Xiu-li.Study on influencing factors of shear strength parameters of slide zone clay in Three Gorges Reservoir area[J].Rock and Soil Mechanics,2006,27(1):56-60. |
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| Authors: | LI Wei-shu WU Ai-qing DING Xiu-li |
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| Institution: | Department of Rock foundation, Yangtze River Scientific Research Institute, Wuhan 430010, China |
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| Abstract: | For the multiformity, complexity of the slide zone clay and unequal of the shear strength parameters in the Three Gorges Reservoir area, the main factors affecting the shear strength parameters including geological representation, specimen size, test number, stress level are reseached, especially for the unequally shattered clay and silty clay, those factors may bring out much more influence. The characters of the slide zone are changed with the different places. The two groups test between the different places and the same characters of the slide zone show that the shear area should be no less than 2 500 cm2, otherwise the shear strength parameters (c, ?) are much unequal. The three groups tests in the same place, 5 or 6 points a group, show that the shear strength parameters (c, ?) have 0.5-1.0 time difference, and show that the test number in a group should be no less than 5 points; the contrast test under the different moisture content shows that the moisture content is more, and the parameters (c, ?) is littler. For the unequal characters of the shattered clay and silty clay, the granules diameters and content of the crushed stone also affect the shear strength. So, tester must sechedule reasonable test scheme according to code, project character, and environment of the slide zone, analyze the parameters according to macroscopical characters of slide zone and actual conditon of test point, then put forward proposition parameters. |
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| Keywords: | Three Gorges Reservoir area slide zone clay parameters of shear strength influencing factors |
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