| 饱和膨润土及其与砂混合物的压缩变形特性 |
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| 引用本文： | 孙文静,孙德安,孟德林.饱和膨润土及其与砂混合物的压缩变形特性[J].岩土力学,2009,30(11):3249-3255. |
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| 作者姓名： | 孙文静 孙德安 孟德林 |
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| 作者单位： | 上海大学,土木工程系,上海,200072 |
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| 基金项目： | 国家自然科学基金，上海大学研究生创新基金 |
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| 摘 要： | 对用不同制样方法得到的饱和膨润土及其与砂混合物进行了压缩试验。试验结果表明，饱和膨润土的压缩曲线呈双线性，不同于普通黏土的压缩曲线。压缩试验中量测了侧向应力，由此得到的饱和膨润土的静止侧向压力系数值较一般黏土的数值要大。对膨润土与砂混合物的击实样进行了由非饱和到饱和状态的浸水试验，并得出试验过程中侧向应力的变化规律。由于浸水饱和的试样和抽真空饱和的试样在较高压力时压缩曲线趋于一致，可采用快速抽真空饱和的方法进行试验研究，以缩短非饱和混合物击实样浸水饱和所需时间。引入骨架孔隙比的概念，用来判断膨润土与砂混合物中砂骨架是否形成，得出影响混合物压缩特性的决定因素。
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| 关 键 词： | 饱和膨润土 膨润土与砂混合物 压缩曲线 侧向应力 浸水膨胀试验 骨架孔隙比 |
| 收稿时间： | 2009-02-12 |
Compression deformation characteristics of saturated bentonite and sand-bentonite mixtures |
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| SUN Wen-jing,SUN De-an,MENG De-lin.Compression deformation characteristics of saturated bentonite and sand-bentonite mixtures[J].Rock and Soil Mechanics,2009,30(11):3249-3255. |
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| Authors: | SUN Wen-jing SUN De-an MENG De-lin |
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| Institution: | Department of Civil Engineering, Shanghai University, Shanghai 200072, China |
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| Abstract: | The compression tests are completed on saturated bentonite and sand-bentonite mixtures with different preparations. The test results show that the compression curves present a bilinear shape, which is different from that of ordinary normal consolidated clays. The coefficient of lateral earth pressure of saturated bentonite at-rest is obtained by K0-oedometer; and the K0 value is greater than that of ordinary clays. The change in the lateral stress is obtained during the water uptake test on compacted sand-bentonite mixtures which is transited from unsaturated to saturated states. The compression curves of compacted specimens saturated by the water uptake test and the vacuumized methods tend to be consistent in the relatively high stress range. Thus the vacuumized method for saturating the specimens can be adopted to save time for performing the water uptake test. The concept of skeleton void ratio is used to judge if the sand skeleton is formed in sand-bentonite mixtures, and to obtain main factors affecting the compression behaviour of the mixtures. |
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| Keywords: | saturated bentonite sand-bentonite mixtures compression curve lateral stress swelling test skeleton void ratio |
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