Study on Pre-reinforcement Scheme of Pile Foundation of Shallow-buried Super-large Double Circular Pipe Jacking Side-crossing High-voltage Tower
In this paper,based on the N14 high voltage tower of the 2#pipe jacking side crossing Wangyang Ⅰline of Shenzhen Tiegang-Shiyan reservoir water quality assurance project,the pre-reinforcement scheme of pile foundation of shallow-buried super-large double circular pipe side crossing high voltage tower is systematically studied.Three reinforcement schemes,"pipe curtain support","pipe curtain support+borehole perfusion occlu-sal pile+rotary jet pile"and"pipe curtain support+micro pile+rotary jet pile",are proposed.Numerical mod-els are established by MIDAS/GTS to analyze the reinforcement effects of the three schemes.The results show that the reinforcement effect of the scheme 1 is not ideal,while the reinforcement effect of the scheme 2 is signifi-cantly improved,and the settlement of pile foundation is most significant,which is 53%lower than that of scheme 1.However,compared with the scheme 2,the overall settlement,horizontal displacement,longitudinal displace-ment and settlement difference of adjacent pile foundation in the scheme 3 are reduced by 42%,20%,16%and 19%,respectively,which can effectively control the stability of pile foundation.After reinforcement,the maximum settlement of the tower is 5.49mm,the maximum horizontal displacement is 3.99mm,the maximum longitudinal displacement is 2.28mm,the maximum differential settlement of adjacent towers is 0.95mm,and the maximum lo-cal tilt of the foundation is 0.03%,which meets the construction control standards.The reinforcement technology of"tube curtain support+micro pile+rotary jet pile"can better control the settlement of pile foundation of the tower,ensure the safety and normal use of the high pressure tower,and provide reference for similar projects.
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