Analysis Of Stability Of High Pile Wharf Slope Based On Strength Reduction Method

High pile wharf can obtain good water depth condition,which is the most common type of port hydraulic structure on offshore soft soil foundation.In recent years,the instability of high pile wharf slope is becoming more and more serious,and some of them need expensive cost to repair.The slide of the pile wharf slope is related to the overall stability and the normal use of the pier,which is a serious threat to the life and property safety of the people.Influence factors of the stability of high pile wharf slope include geological conditions,pile foundation construction,water level fluctuation and human factors.The people related to the design,construction,supervision and management of the pier need to implement the relevant laws and regulations or mandatory standards of wharf construction to ensure the normal use of the project.Therefore,it is of great significance to study the stability of high pile wharf slope.At present,there are many methods to analyze the stability of bank slope,but these methods have their own advantages and disadvantages of varying degrees.Therefore,how to make a reasonable choice has cause people’s attention.This paper is based on the summarizes to the research results and the latest progress of slope stability analysis method,and introduced several common methods of slope stability analysis,then conduct a series of studies to the slope stability around the finite element strength reduction method,and modified the strength reduction method.The main contents are as follows:(1)Expounded the research status of the finite element strength reduction method and slope stability,and introduced the calculation method of safety factor of bank slope stability in detail,then analyzed their respective advantages and disadvantages;(2)Around the constitutive relations,simply introduced the yield criterion,flow rules and the hardening laws,emphatically described the commonly used M-C yield criterion and various D-P criterion in detail,and conduct a series of derivation process of them;(3)Introduced the application of strength reduction method in ABAQUS,emphatically described several common slope instability criteria,and expounds the matters needing attention in the finite element calculation;(4)Studied the influence of single factor on the stability of high pile wharf slope,including piling construction,water level change and loading and unloading.Established the finite element model in ABAQUS,and calculated the safety factor by finite element strength reduction method.According to the calculated safety factor of the bank slope under different factors,analyzed the causes of the instability of the bank slope.Using traditional limit equilibrium method and finite element strength reduction method to analyze the influence of piling construction and water level change to the slope stability at the same time,and compared the results of two method to verify the reliability of finite element strength reduction method;(5)Combined with the examples of specific high pile wharf project,emphatically studied the influence of loading and unloading to the bank slope stability,and calculated the safety factor of bank slope under three kinds of instability criterion respectively,comparatively analyzed the applicability of three kinds of instability criterion so as to better conduct engineering practice.