就地固化表层地基承载特性现场试验研究OA北大核心CSTPCD

Based on the ground treatment of the north extension of No.31 provincial road in the urban section of Shaoxing in Zhejiang Province,the feasibility and treatment effect of two methods,i.e.,ALLu strong stirring head stirring method with homemade equipment and ALLu strong stirring head combined application,by in-situ curing foundation treatment were studied.Plate loading test,unconfined compressive strength(UCS)test,standard penetration test and static cone penetration test were carried out,respectively.Meanwhile,in order to obtain the stress and deformation of the in-situ curing foundation,field monitoring was carried out by arranging the earth pressure box and settlement plate.The test results showed that the bearing capacity of foundation by in-situ curing were increased by at least 30%compared with the traditional replacement method.At 28 days of curing time,the ratio of UCS of curing soil in-situ to that of indoor value was 0.35-0.65.The bearing capacity of foundation was improved by standard penetration test and static cone penetration test,and the calculating bearing capacity were consistent with the measured results of plate loading test.The stress and additional stress coefficient of the two groups of road sections were analyzed,and the artificial crust layer had better effect on the diffusion stress,which can be used for detection of in-situ shallow stabilization in engineering practice.