孔压静力触探用于含浅层生物气砂土工程特性的试验研究

On engineering characteristics of sallow biogenetic gassy sand by piezocone test

含浅层生物气的砂土是一类特殊的非饱和土,由于此类砂土中含有封闭的生物气,生物气的存在对砂土的工程性质影响较大,使其有着有别于一般饱和砂性土的特殊工程特性。采用孔压静力触探仪,对砂土是否含有生物气进行了初步判别,然后对生物气释放前后砂土的承载性能进行了现场和室内试验对比研究,认为在含气砂土不发生渗透破坏的情况下生物气的缓慢释放会提高砂土的承载力,对砂土上部建筑物的稳定是有利的。

Shallow biogenetic gassy sand is one of special unsaturated soil. Because of containing closed biogenetic gas, whose existence has great influence on the engineering property of sand, the sandy soil has special engineering characteristic from other common ones. In this paper, the initial judgment is drawn on whether sand contains biogenetic gas, and then the in-situ and laboratory tests are done to compare the bearing capacities of sand before and after gas release. It is found that with avoiding seepage failure happening, the slow release of biogenetic gas can increase the bearing capacity of sand, which will be good for the stability of upper buildings.