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采用室内模型试验方法,对3种开孔方式的带帽有孔管桩复合地基和带帽无孔管桩复合地基进行试验,比较分析桩帽间土压力、桩帽下土压力、桩土荷载分担比、桩土应力比等性状规律。结果表明:带帽有孔管桩复合地基桩帽间土体表面土压力比带帽无孔管桩复合地基要大;带帽有孔管桩复合地基桩土荷载分担比、桩土应力比均小于带帽无孔管桩复合地基;带帽有孔管桩复合地基更能发挥桩周土体分担荷载的作用。研究成果验证了孔隙水能通过桩孔进入有孔管桩内腔,减少土体含水量,提高桩周土体抗剪强度,为带帽有孔管桩复合地基理论研究提供试验依据,对其应用推广具有指导价值。
Three kinds of open-hole perforated pipe-pile composite foundations and perforated non-perforated pipe-pile composite foundations were tested by the indoor model test method. Soil pressure between pile caps, earth pressure under pile caps, pile-soil load Sharing ratio, pile-soil stress ratio and other traits. The results show that the soil pressure on the soil surface between pile cap and capped perforated pipe pile composite foundation is larger than that of the composite foundation with capless perforated pipe pile composite foundation. The load-sharing ratio of pile-soil and soil-pile, It is less than the composite foundation with the perforated pipe-pile without cap. The composite foundation with the capped perforated pipe-pile can play the role of the soil-sharing of the soil around the pile. The research results verify that the pore water can enter the inner cavity of the perforated pipe pile through the hole, reduce the soil water content and improve the shear strength of the soil around the pile, provide the experimental basis for the theoretical study of the composite foundation with the perforated pipe pile. Application promotion has guiding value.