Model test study on stress and deformation characteristics of inclined straight pile supporting structure in loess foundation pit
In order to deeply explore the working mechanism and deformation characteristics of the inclined straight pile sup-port,the changes of pile top displacement,pile bending moment and settlement outside the pit between the inclined straight pile and the traditional support during the excavation and rainfall stages were compared by model tests.The results show that both the force and deformation of the inclined straight pile are smaller than those of the cantilever and double row straight pile,its ultimate excavating depth is larger,and the influence on the surrounding environment is less,among which the inter-nal inclined straight support has the best performance.Changing part of the straight pile to inclined pile can make the force more reasonable,in addition to bending shear,there are tensive compression,which effectively improve the support stiffness.During the rainfall stage,the stress and deformation of the support structure increase more than that of excavation,and it will also cause soil collapse,surface cracking of soil inside and outside the pit,and other damage.The research results can provide reference for prevention and control of risk in construction of inclined straight pile loess foundation pits.
inclined straight pileloess foundation pitmodel testrainfall
NETL
NSTL
万方数据
维普
