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钻孔灌注桩技术,因其对各种土层的适应性强、无挤土效应、无震害、无噪音、承载力高等优点,在工程中得到了广泛应用。钻孔灌注桩对于一般粘性土、填土、淤泥质土及砂土等,穿越方便,成孔效果较好,而对于碎石粘土则不宜采用。本文就钻孔灌注桩穿越碎石粘土层的工程实例进行分析,对穿越该类土的设计施工提出一些看法,从而为同类土层中设计钻孔灌注桩时桩端土层的选取提供参考。
Drilled cast-in-place pile technology has been widely used in engineering due to its advantages of strong adaptability to various soil layers, no squeezing effect, no earthquake damage, no noise, and high bearing capacity. Bored cast-in-place piles are convenient for general cohesive soils, fills, muddy soils, sands, etc., and have a good pore formation effect. However, they are not suitable for gravel-clay clays. This paper analyzes the engineering examples of bored cast-in-place piles passing through the gravelly clay layer, and puts forward some views on the design and construction of this kind of soil, so as to provide reference for selecting the soil layer at the end of the bored piles in the same soil layer.