采用岩基载荷试验确定桩孔灌注桩端承载力值方法的研究

Study on Bored Cast-in-place Pile End Bearing Capacity Determination through Rock Foundation Load Test

岩基载荷试验,一般安排在天然地基或干作业混凝土灌注桩底部。当岩基载荷试验在地表测试时,就不可避免的存在桩周摩擦力的影响。选择工程地质条件相似的区域,依据不同桩径钻孔灌注桩的岩基载荷试验,运用规范中的估算公式,消除桩周摩擦力的影响,计算了桩端持力层的承载力值。该方法为今后合理、经济地确定桩端持力层的承载力值提供了一个新的思路。

The rock foundation load test is generally planed on natural foundation or dry operated concrete cast-in-place pile bottom. When the test is on ground surface, the impact from friction around pile is inevitable. The paper selected regions have similar engineering geological condition, carried out rock foundation load tests for bored cast-in-place piles with different pile diameters, using estimation formula from related criterion to eliminate impact from friction around pile, estimated pile end bearing stratum bearing capacity. The method has provided a new idea for reasonable, economical determination of pile end bearing stratum bearing capacity henceforth.