Experimental Study On Bearing Capacity Of Cement Soil Semi Rigid Compaction Pile Composite Foundation

Cement soil,lime soil pile composite foundation technology in Northwest China is widely used to improve the bearing capacity and eliminate collapsibility,in order to achieve more economic and resource saving effect,many additives have also been applied to the cement soil and dust,in order to improve its strength.The strength of cement soil and lime soil filled with various admixture is improved to a certain extent.In this paper,in the 1:6 soil cement with different content of lime as additives for example has been studied for a period of 7 months,found that the amount of lime can improve the unconfined compressive strength,shear strength,cohesive strength and elastic modulus of soil cement;unconfined compressive strength and excessive lime will suppression of water soil,but the effect on other parameters is of important reference value to practical engineering.At the same time,the unconfined compression test stress-strain curve is deduced based on the characteristics of soil cement with a small amount of lime the damage constitutive equation and damage evolution equation,combined with the previous research indicates that the constitutive model and damage evolution equation of the damage is also suitable for loess cement and adding a small amount of cement lime.It is proved that the formula is in good agreement with the stress-strain curve in laboratory,and the formula has less parameter and is easy to obtain.The calculation is simple and convenient.The constitutive model of damage theory and pile damage based on modified semi rigid pile composite foundation settlement calculation formula,and the use of the formula of settlement of composite foundation have been built in Xi'an Dahua Park family building block 9#1#under different load are calculated.The calculation results with the standard algorithm results drawn into P-S the graph,analyzes the bearing capacity of the composite foundation,the modified algorithm the calculation precision is 13%more than the standard algorithm.At the same time,the ultimate bearing capacity of the semi rigid pile composite foundation with different fillers is simulated by FLAC3D,and the maximum bearing capacity is obtained.It has certain guiding significance for the actual project.