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通过室内模型试验,实测得到了在等厚径比条件下,长短刚性桩复合地基长桩、短桩、桩间土的承载力发挥系数,得到了长桩、短桩、桩间土承载性状与厚径比的相关关系,长短刚性桩复合地基采用等厚径比,使长桩、短桩和桩间土承载力都得到充分发挥是很困难的,且短桩承载力发挥较长桩更为充分。在等厚径比试验结果基础上,对长短刚性桩复合地基变厚径比设计进行了研究探讨,认为长短刚性桩复合地基宜采用变厚径比设计,降低长桩厚径比、提高短桩厚径比,让长桩厚径比小于短桩。变厚径比设计可采用等褥垫厚度变桩径(长桩桩径取大值)或等桩径变褥垫厚度(长桩选用较薄褥垫)来实现。
Through indoor model test, the bearing capacity of long piles, short piles and piles of soil under constant thickness ratio conditions were obtained. The bearing capacity of long piles, short piles and piles was obtained. Thickness-diameter ratio of the relationship between the length and short rigid-pile composite foundation with equal thickness-diameter ratio, so that the long pile, short pile and soil between the bearing capacity of the full exertion is very difficult, and the short pile capacity to play longer pile more full. On the basis of the test results of equivalent thickness to diameter ratio, the design of variable thickness-thickness ratio of rigid-rigid pile composite foundation is studied and discussed. It is concluded that the variable thickness-thickness ratio design of long-short rigid-pile composite foundation should be adopted to reduce the ratio of thickness to diameter of long- Thickness ratio, so that the thickness ratio of long piles less than short piles. Variable thickness ratio design can be used such as changing the thickness of the mat diameter (long pile diameter to take large value) or equal diameter pile mat (long pile use thinner mat) to achieve.