Application Of Loess Pile Composite Foundation DDC

At present,the processing means of collapsible loess foundation more mature,which is currently the focus of research in the field of ground handling,In the construction of our country civil engineering,the application of collapsible loess foundation treatment,has been widely applicated.Because the environment,the formation of different time and place is different,so the loess appearance will have different characteristics.In the case of the formation of the loess period is short,the influence of the loess collapsibility in will be very strong,will have certain influence to the stability of the engineering.The main contents of this paper is to approach the hole deep compaction(DDC)composite foundation are discussed.Piles Construction Technology for use DDC to deal with a Collapsible loess foundation,both the bearing capacity can meet the requirements of the design,but also can be further advanced construction technology and do affordable and green construction combined.This article briefly describes the country loess and loess in the main distribution,summarizes the processing method of composite foundation theory and collapsible loess foundation,analyzed by calculating settlement of foundation bearing capacity calculation and influence of composite foundation,after theory and practice constantly demonstrated in engineering background,according to the relevant requirements of the master's thesis on the project using the method of simulation analysis,theory and practice,combined with the actual situation of the specific characteristics and bearing capacity of composite foundation DDC and theoretical foundation settlement carried out systematically.We can learn the following conclusion by analyzing the results: the analysis of the mechanism especially collapsible loess collapsibility of loess,the collapsibility of the foundation most commonly used many kinds of measures are expounded.Using numerical simulation method for the DDC Method of data analysis,pile diameter and pile length numerical expand simulation,using the DDC Method in Loess Collapsible venues foundation treatment time,different pile diameter and pile appearance corresponding to the stress and settlement.Based on the FLAC3 D numerical simulation,the paper analyzes the different settlement of the foundation under different pile length L and the diameter D,and determines the optimal pile size and the optimal pile length,and then selects the best construction plan.The results show that the bearing capacity,compacting factor and compaction coefficient are satisfactory.