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桩底沉渣的存在不可避免会降低灌注桩的承载力。结合孔底沉渣形成特征,研究混凝土对桩底沉渣的冲击作用,通过室内水-岩相互作用研究红层泥岩地区孔底沉渣在不同条件下的形成特征,同时利用室内冲击试验和现场冲击试验,研究混凝土对沉渣的冲击作用在不同影响因素下沉渣性质的变化规律。试验结果表明:孔底为干孔时,孔底沉渣是小颗粒天然含水率沉渣;若孔底为湿孔,孔底沉渣为饱和泥化物或细颗粒沉渣;在混凝土冲击作用下,干孔中沉渣基本无变化,湿孔中沉渣反孔顶明显,可能导致桩底缩径。
The existence of bottom sediment will inevitably reduce the bearing capacity of cast-in-place piles. Combined with the characteristics of sediment formation at the bottom of the hole, the impact of concrete on the bottom sediment is studied. The formation characteristics of the bottom sediment under the red mudstone area under different conditions are studied by the indoor water-rock interaction. By using the indoor impact test and the field impact test, Study on the impact of concrete on the impact of sediment under different influencing factors of sediment changes in the law. The test results show that when the hole bottom is dry hole, the hole bottom sediment is a small particle natural water content sediment; if the hole bottom is a wet hole, the hole bottom sediment is saturated clay or fine granular sediment; under the concrete impact, Sediment basically no change in the wet hole in the anti-pore sediment obvious, may lead to reduced diameter at the end of the pile.