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刚性桩复合地基具有提高承载力幅度大、控制变形能力强等优点,在工程实践中得到广泛应用。工程实践表明,在岩层埋置较浅的地区,也可采用刚性桩复合地基技术来提高地基的承载力。然而,由于桩端为岩层的刚性桩复合地基的理论研究较少,对该类刚性桩复合地基桩端持力层的选择存在不同认识。针对该问题,本文选用桩端为岩层的刚性桩与不同厚度褥垫层进行复合地基的承载特性试验研究。通过试验结果分析,证明了褥垫层对于刚性桩和土的荷载分配调节能力很强,通过合理设置褥垫层,能够使桩端为岩层的桩间土承载力得到发挥,保证桩土共同作用,从而使刚性桩与桩间土构成复合地基。本文研究成果可以深化人们对刚性桩复合地基的理论认识,为桩端为岩层的地质情况下选用刚性桩复合地基提供技术支持。
Rigid pile composite foundation has the advantages of increasing bearing capacity, controlling deformation ability and so on. It has been widely used in engineering practice. Engineering practice shows that rigid foundation composite foundation technology can also be used to improve the bearing capacity of foundations in areas with shallow depths. However, since there are few theoretical researches on the rigid pile composite foundation with rock pile ends, there are different understandings on the choice of the bearing layer of the pile end of such rigid pile composite foundation. In order to solve this problem, this paper chooses the test of bearing capacity of composite foundation with rigid piles whose pile ends are rock strata and different thickness of cushion. Through the analysis of the test results, it is proved that the cushion has a strong ability of adjusting the load distribution of the rigid pile and the soil. By reasonably arranging the cushion, the bearing capacity of the soil between the pile and the rock can be exerted to ensure the mutual effect of the pile and the soil , So that rigid pile and soil between piles constitute composite foundation. The research results in this paper can deepen the theoretical understanding of the rigid pile composite foundation and provide technical support for the selection of rigid pile composite foundation under the geological conditions where the pile ends are rock strata.