Western Yunnan Mountainous Area Of ​​large Diameter Pile Bearing Performance Test

Directed against the problem on confirming vertical bearing capacity of large diameter cast-in-place pile in the west of coteau area of Yunnan province, the paper, analyses the influence degree of the variety of soil physics and mechanics property in area geology condition on bearing capacity of pile foundation, through 5 piles' loading test; the influence degree of construction technics on bearing capacity of pile foundation under the influence of every exterior factors; the influence degree of grouting injection around the pile shaft on bearing capacity of pile foundation. The paper draws some valuable conclusions: the limited bearing capacity of manual excavation filling pile is much higher than the limited bearing capacity of machine drilled filling pile; Through grouting injection around the pile shaft, the pile bearing capacity can be effectively improved; Proportion of resistance force around the pile side in total load is much larger than that of pressure on the pile tip, and the intensity of resistance force around the pile side is 30-50KPa on average. The paper also advise that the design of pile vertical bearing capacity in the west of coteau area of Yunnan province taking advantage of the experience formula which adopt subentry safety factors, and come up with the value range of the parameters preliminarily.