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在某机场飞行区进行强夯加固浅层粉土地基的现场试验,对地表沉降、地下水位和孔隙水压力等进行了监测,并在试验后进行静力触探试验和标准贯入试验。结果表明:强夯处理后消除了地层6 m深度范围内粉土地基的液化,同时改善了该范围内土层的工程性质。强夯前需采取降水措施,可有效避免出现夯坑内积水和场地局部液化现象,强夯加固产生的超静孔隙水压力消散比较快。强夯施工间隔1 d后不同深度的超静孔隙水压消散比例都超过80%,间隔5 d后超静孔隙水压基本消散,点夯加满夯处理的加固效果整体上好于满夯,并且较小单击夯能和较多夯击次数的点夯施工工艺可以获得较好的加固效果,采用1 500 kN.m夯能点夯两遍和800 kN.m夯能满夯一遍的施工工艺较为合理。
In the airport flight zone, a field test was carried out to reinforce the shallow silt foundation by dynamic compaction. Surface subsidence, groundwater level and pore water pressure were monitored. After the test, static penetration test and standard penetration test were conducted. The results show that the dynamic compaction treatment can eliminate the liquefaction of silt ground within the depth of 6 m and improve the engineering properties of the soil in this range. Pre-ramging precipitation measures need to be taken to effectively prevent the occurrence of hydraulics rammer pit and local liquefaction phenomenon, dynamic compaction of excess pore water pressure dissipation dissipated relatively quickly. Dynamic compaction after 1 d interval at different depths of ultra-static pore water pressure dissipation ratio of more than 80%, 5 d interval after the ultra-pore pore water pressure dissipated, the point of ram plus full ramming reinforcement effect as a whole better than ram, And the smaller click rammer and more ramming times ram construction technology can get better reinforcement effect, the use of 1 500 kN.m ram point ram twice and 800 kN.m ramming rammer over again construction Process is more reasonable.