水泥加固海相淤泥室内配比试验与现场工艺试桩

针对软弱海相淤泥问题土的加固问题,依托香港机场扩建工程,首次在该地区开展深层水泥搅拌法(湿法)的室内配比试验和现场工艺试桩,着重研究淤泥的土性参数、水泥掺量和养生龄期等因素对室内和现场水泥土强度的影响,得出其强度随水泥掺量和养护龄期增加而显著增长的规律,以及不同龄期室内水泥土的强度比例关系。本研究为香港地区滨海软土地基推广应用DCM工法加固,提供了很好的工程借鉴和技术参考。

Experiment of laboratory mixing and site trial for marine deposit stabilized with cement

For the improvement of problematic soil of soft marine deposit, in Hong Kong airport project, we carry out the experiment of laboratory mixing and site trial for marine deposit improved by deep cement mixing(DCM)with wet method for the first time. From testing results, we research the important influence factors, including soil properties, cement dosage, curing age, etc., on the unconfined compression strength(UCS)of laboratory and in-situ cement-soil mixtures, and find that the UCS of mixtures increases evidently with increasing of binder dosage and curing age, and obtains the correlation between mixture UCS and curing age. The research results provide good engineering reference for further application of DCM method used for soft ground improvement in Hong Kong.