Study on the Engineering Properties of Soil after Flocculation and Dehydration of Waste Mud in Foundation Pile Construction
One of the common methods for dehydration of waste mud in foundation pile construction is to de-hydrate with geobags after adding flocculant.Combined with the construction of foundation piles of the 8 sec-tions in front of Xiongshang High-speed Railway Station,the geobag model test was used to study the influence of the dehydration age,the type of flocculant and the type of geotextile on the engineering properties of floccu-lation soil after dehydration.The results show that,with the gradual increase of the age period,the water con-tent of flocculation soil decreases rapidly and the density gradually increases to gradually stabilize,its cohesion and internal friction angle gradually increase,the strength gradually increase,which is inversely proportional re-lationship to density;different types of geotextile have little influence on the properties of flocculated soil.Therefore,the woven geotextile with higher strength can be selected to increase the overall strength of the mud soil in geobags;The study finds that the 28-day strength of the flocculated soil obtained by adding CPAM with a mass ratio of 5%alone or PAC and 4%NPAM with a mass ratio of 3%and 4%is relatively high,and its engineering properties can better meet the requirements of the engineering application.It can be used in sub-grade filling and other projects after a minor treatment.
The 8 sections in front of Xiongshang High-speed Railway StationMudDehydrationFlocculantGeotextileShear strengthEngineering properties
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