| 袁俊平,殷宗泽.膨胀土裂隙的量化指标与强度性质研究[J].水利学报,2004,35(6):0108-0113 |
| 膨胀土裂隙的量化指标与强度性质研究 |
| Quantitative index of fissure and strength characteristics of fissured expansive soils |
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| DOI： |
| 中文关键词: 膨胀土 裂隙 远距光学显微镜 灰度熵 裂隙度 强度 |
| 英文关键词: expansive soils fissures long distance microscope system gray level entropy fissure development degree strength |
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| 中文摘要: |
| 利用远距光学显微镜对重塑膨胀土中在自然风干条件下的裂隙发展变化进行了动态的、定量的观测，对不同裂隙发育程度的膨胀土进行了不排水、不排气的非饱和三轴多级剪切试验。试验结果表明，裂隙图像的灰度熵可以很好地表征裂隙的发育发展程度，适合作为膨胀土裂隙发育程度的度量指标。环境温度较高、湿度较低有利于膨胀土中裂隙的发育发展。膨胀土中裂隙发展是一个长期的、渐进的过程，初期裂隙发展速度较快，后期大大减缓。裂隙膨胀土的强度指标与饱和度和裂隙度呈线性关系，土体裂隙不发育时，饱和度是影响强度的主导因素，而饱和度较低时，裂隙对膨胀土强度的影响占主导地位。 |
| 英文摘要: |
| The development of remolded expansive soils was measured by using long distance microscope system under the condition of natural air-dried. The un-drained and triaxial multi-stage shear tests for various soil samples containing different amounts of fissure were carried out. The result shows that the gray level entropy of observed pictures c an well describe the development degree of fissures. The development of fissures is a long-term gradual process. The fissures develop rapidly at the beginning but remarkably slow down in l-2 days. The strength parameters of expansive soils are linearly related to the saturation degree and fissure development degree. In case the development of fissures is weak the saturation of soils may strongly affect the strength of soil. But fissure is the primary factor affecting the strength of soil with low saturation. |
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