摘要
北京通州区某会馆基坑底为饱和粉细砂并夹有淤泥,非常软弱,现场标贯试验判断基坑以下5m范围内为中等—严重的液化土,建议采用碎石桩法进行处理。但由于施工区基坑狭小、侧壁陡直,且地下管线密布,碎石桩难以施工。在准确验证场地液化层厚度的基础上,采用了静压注浆法来处理该液化地基,并用瑞利波法检测注浆前后的场地等效平均波速。检验结果显示,注浆后的场地等效平均波速高于140m/s,说明该处理方法达到了消除地基液化的目的。
The footing groove bottom in a guildhall site in the Tongzhou district, Beijing is very weak saturated silt and fine sand intercalated with sludge. According to site standard penetration tests, under the footing groove within 5m range is medium-severely liquefied soil, thus gravel piling has advised in treatment. But because of footing groove is narrow in the site, side wall steep, and studded with underground pipelines, thus gravel piling is hard to operate. Based on accurate measurement of liquefied layer thickness, static grouting technique has used to treat the liquefied foundation, and site equivalent average wave velocity was checked before and after grouting through the Rayleigh wave method. The examined results demonstrated that the site equivalent average wave velocity after grouting is higher than 140m/s, thus the treatment method has accomplished the target to eliminate foundation liquefaction.
出处
《中国煤炭地质》
2010年第6期41-44,共4页
Coal Geology of China
关键词
液化地基
地基处理
静压注浆法
瑞利面波法
liquefied foundation
foundation treatment
static grouting
Rayleigh wave method
