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山区道路穿越湖区施工首先面临的是湖积软土造成的路基沉降和稳定性问题。结合江西省某穿越湖区的道路工程,对抛石挤淤法处理湖积软土路基的效果进行了现场试验研究。发现在这种地质条件下,抛石挤淤施工的碎石填料的用量与湖积软土中的淤泥层的厚度有很好的相关性,淤泥的厚度越大,挤淤量也越大。现场通过钻孔法和面波法的检测确定了抛石体的厚度,发现湖底的淤泥被挤开,但是下部较硬的淤泥质土并未完全挤开。最后根据抛石用量计算了抛石体侧向延伸的宽度,给出了抛石体的形态,为抛石路基的稳定性分析提供了依据。
Mountain road through the lake area construction is the first face of the lake soft soil caused by roadbed settlement and stability problems. Combining with a road project in a crossing of the lake in Jiangxi Province, a field test was conducted on the effect of treating rock embankment with lapped-silt method. It is found that under such geological conditions, the amount of rubble filler used in rock dumping and silting construction has a good correlation with the thickness of silt layer in lacustrine soft soil. The larger the thickness of silt, the larger the amount of silt deposit. In the field, the thickness of the riprap body was determined by the drilling method and surface wave method. It was found that the mud at the bottom of the lake was squeezed out, but the harder muddy soil at the bottom did not squeeze out completely. Finally, according to the amount of riprap, the width of lateral extension of riprap is calculated, and the shape of riprap body is given, which provides the basis for the stability analysis of riprap subgrade.