Research On Safety Evaluation Technology Of Micro Pile Support System

As a common natural disaster,landslide has brought many inconvenience to human's production and life.In the western mountain area,the proportion of the total number of all kinds of disasters is as high as 65%,especially in Shaanxi and Sichuan.Most of these landslides belong to the shallow accumulation layer landslide,which is now in the form of micro pile support system.However,due to the existence of the micro pile in the theoretical study,many mechanisms have not been found so far.In the micro pile design stage,is based on the previous experience of the project design,there is no clear specification and theoretical guidance,this is the micro pile in the engineering application of the security of the hidden dangers.And for the evaluation of the safety of micro pile support system,there is not a complete evaluation system.This paper is aimed at the above situation,the application of micro pile in practical engineering can make the evaluation of the overall safety,reduce the security caused by the lack of human factors.Through the research on the safety evaluation technology of the micro pile support system,we can get the evaluation indexes of the micro pile support system in the security aspect,and establish the relatively perfect safety evaluation system.The paper used engineering data collection,engineering examples of research and engineering example calculation and numerical simulation analysis of a series of procedures to draw micro pile mainly safety evaluation index,finally according to these indexes established safety evaluation system of micro pile.Based on the research on the influencing factors of the performance of the micro pile,the failure mode and safety evaluation index are obtained,and the results are as follows:(1)The effect of micro horizontal bearing capacity,pile length,pile body integrity,concrete strength and earthquake on the performance of micro pile is obtained;(2)That the pile length,the embedded depth,solid strength of rock mass and the pile body integrity of micro pile internal force and deformation of the embedded.(3)The main failure types of the micro pile support system are summarized;(4)The main safety evaluation indexes of the micro pile support system are obtained,and the safety evaluation system of the micro pile is established.