哈密弱-中膨胀性土微观结构研究

THE MICROSTRUCTURE STUDY ON WEAK OR MEDIA EXPANSIVE SOIL FROM HAMI

本文用孔结构仪对哈密弱-中性膨胀土原状试样、重塑试样和风干重塑试样,进行了微观结构对比试验,获得大量珍贵的膨胀土微观结构照片。对哈密膨胀土微观结构对比试验数据和照片分析研究可得:膨胀土的特殊微观结构可能是膨胀土膨胀特性的又一重要影响因素;不同干密度、含水率的重塑土样微观结构具有一定的规律,含水率越大、干密度越小,土样表面孔隙面积越大,孔隙越多,孔隙直径越大,孔隙直径分布越分散;原状样孔隙主要为0~0.1 mm的孔隙,重塑土大多为0~0.2 mm的以0.1 mm为峰值的孔隙。

Compared the microstructure of undisturbed sample,drought and undrought unsaturated remoulded sample of Hami expensive soil with the air content analysis equipment of cement,and a lot of microstructure pictures are obtained. According the analyses of the results and photos of Hami expensive soil,the follow rules are obtained: the special microstructure of expensive will be another key reason for the expensive character of expensive soil; the difference of drought density and moisture will influence the microstructure of the soil in some rule,with the increase of moisture or decrease of drought density,the area of pores on the surface of the sample will increase,and the number or the size of the pores will get large; the pores of undisturbed samples rounded the size about 0 ~ 0. 1 mm,but the pores of unsaturated remoulded mainly cycled the range from 0 mm to 0. 2 mm which the summit is 0. 1 mm.