摘要
压密灌浆和劈裂灌浆都是加固弱透水性地基的有效办法。前者通过浆泡，后者通过浆脉网来挤密邻近土体和提高土中的主应力和，从而降低压缩性和提高贯入击数。在劈裂灌浆中，只有灌入大量浆液后，才见加固效果，加固的土体大。相反，在压密灌浆中，灌注少量浆液，即可对小范围的土进行加固。快速灌注稠浆是保证产生压密型灌浆的有效办法，但中途经常转化为劈裂型灌浆。劈裂灌浆的施工较简单、费用低，它不可能转化为压密灌浆。
Both compaction grouting and fracturing grouting are effective to strengthen foundation soils,because the net of grouting veins induced by fracturing grouting similar to the grout bubbles induced by compaction grouting can densify their adjacent soils as well as increase the sum of principal stresses.Asa result,the compression modullus and the cone penetration resistance of the foundation soil increase.The effectiveness of fracturing grouting is not evident until a large amount of grout is injected, Whilst,compaction grouting can soon improve a soil of small volume by injecting very limited amount of grout.But for a large volume of soil to be treated, fracturing grouting is cheaper and easier to perform. Frac-turing grouting is suitable for foundation soil of large volume,while compaction grouting is applicable toboth large and small vblume.Quick injection of very thick grout is an effective way of controlling com-paction grouting,however,it is usually transferred to fracturing grouting.On the contrary,fracturinggrouting is easy to control and is unable to transfer to compaction grouting.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
1994年第2期22-28,共7页
Chinese Journal of Geotechnical Engineering
关键词
压密灌浆
劈裂灌浆
地基处理
compaction grouting,fracturing grouting,principle,control method,correlation.
