Ningbo Soft Soil Mass Under The Condition Of The Micro Steel Tube Pile Load-bearing Characteristics Of The Study

Based on The ningbo soft soil District characteristics,in order to improve the bearing capacity of steel tubular piles for micro,micro steel pipe piles often to be secondary grouting process or single pile and cement-soil pile form of steel tube body of micro-cement-soil pile composite pile form(The micro steel tube composite piles)In practical engineering,the "tube body-slurry solids(cement-soil pile)-pile soft soil" interactions between factors is more,people failure pattern and the bearing characteristics of the micro steel pipe piles are not very clear.In this paper,the "tube body-slurry solids(cement-soil pile)-pile soft soil",the mechanism and the micro steel pipe piles of different construction technology are summarized.Ningbo actual engineering situation,in view of the micro steel tube pile composite possible multiple failure pattern and the corresponding bearing analysis and calculation,and determine the most likely failure pattern under different conditions and the ultimate bearing capacity.To ningbo The soft soil District grouting micro steel pipe piles of possible failure pattern and the corresponding bearing capacity are analyzed and calculated.In order to better analysis of ningbo The soft soil District micro steel tube the load-bearing characteristics of composite piles,the micro steel tube pile composite compressive static load test of slow to determine the load sharing three stages and ultimate compressive ultimate bearing capacity.Through the finite element software ANSYS to vertical and horizontal loads to the combination of the micro steel tube pile side friction of pile,pile tip resistance and load share ratio,ultimate bearing capacity and the plastic damage cloud image is analyzed,such as the length of the tube is studied,and the tube diameter and unconfined compressive strength of cement-treated soil the effect of the compressive bearing capacity,and compared with previous results contrast analysis.