Experimental Analysis on Bearing Capacity of Grouting Steel Pipe Pile Reinforcement for Collapsible Loess Foundation
In order to solve the problem of uneven wet subsidence settlement and deformation of loess foundation,an analysis is carried out on the reinforcement of collapsible loess foundation by grouting steel pipe pile.The stat-ic load test before and after grouting is carried out on 32 steel pipe piles with Q235 grade material,diameter of Ø108 and wall thickness of 8mm under six independent foundations.It is found that under the same level of load,the deformation of steel pipe piles after grouting is significantly reduced compared with that before grouting.The settlement deformation increases by 50.3%to 92.83%and the bearing capacity increases by 37%to 114.5%compared with that before grouting.In addition,it is also observed that the test load increment ΔQ before and af-ter grouting increases and then decreases with the pile length,and the load increment ΔQ peaks at a pile length of about 11 m.The optimum economic point for loess foundation reinforcement is found.The settlement observation lasting six months after the completion of the improvement and reinforcement shows that there is no obvious con-tinued settlement of the foundation,indicating that the reinforcement effect is remarkable.The results also provide scientific data support for the foundation reinforcement design of engineering structures in collapsible loess areas.
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