本文選題：五星形樁　切入點(diǎn)：截面尺寸優(yōu)化　出處：《巖土力學(xué)》2017年10期 　論文類型：期刊論文

【摘要】：五星形混凝土樁是一種新型截面異形樁,由圓截面均勻內(nèi)切5個圓弧形成,其截面參數(shù)主要有被切割圓半徑R、切割圓半徑r、切割圓弧所對應(yīng)的外包圓圓心角2x、外包圓弧對應(yīng)圓心角θ。經(jīng)截面尺寸優(yōu)化分析,推導(dǎo)出周長最大化五星形樁和周長面積比最大化五星形樁。為進(jìn)一步掌握五星形樁承載性能,以砂雨法制作土樣,在干砂中進(jìn)行了4根單樁對比模型試驗(yàn)研究,4根單樁為:周長面積比最大化五星形樁F_2、周長最大化五星形樁F_1、與F_2等截面周長圓樁C_1、與F_2等截面面積圓樁C_2。試驗(yàn)結(jié)果表明:與F_1相比,F_2的樁側(cè)表面積與其相近,極限承載力大致相同,但F_2混凝土用量是F_1混凝土用量的0.75倍,單位體積混凝土承載力更高,F_2為最優(yōu)的截面尺寸;與等截面面積小圓樁C_2相比,F_2樁側(cè)表面積是其1.53倍,極限承載力是其2.4倍,顯示出在相同混凝土用量下五星形樁F_2具有良好的承載性能,截面異性擴(kuò)大效應(yīng)明顯;與相同截面周長的大圓樁C_1相比,F_2樁截面面積是其0.44倍,極限承載力是其0.96倍,但F_2樁單位體積混凝土承載力是C_1樁的2.21倍,顯示出更高的承載性價比。各級荷載作用下五星形樁側(cè)摩阻力所占比例在80%以上,特別是F_2樁,在90%以上,表現(xiàn)出摩擦樁的特性。研究成果可對五星形樁的工程應(yīng)用提供一定理論支持。
[Abstract]:The five-star concrete pile is a new type of special-shaped pile with cross section, which is formed by 5 circular arcs with uniform internal tangent of round section. The cross section parameters mainly include the cutting circle radius R, the cutting circle radius r, the outer circle center angle 2 x corresponding to the cutting arc, the outer arc corresponding to the center angle 胃. The maximum circumference five-star pile and the circumference area ratio maximization five-star pile are deduced. In order to further understand the bearing capacity of the five-star pile, the sand rain method is used to make the soil sample. Comparative Model Test of four single piles in dry Sand four single piles are as follows: maximum circumference area ratio maximization of five-star pile F2, maximum circumference maximization of five-star pile F1, C1s with F2 equal-section circular pile C1 and F2 with F2 iso-section circular pile C2.Tests are carried out. The results show that the surface area of the pile side of FSP _ 2 is similar to that of FSP _ 1. The ultimate bearing capacity is approximately the same, but the amount of Fstack _ 2 concrete is 0.75 times that of F# _ 1 concrete, and the bearing capacity of unit volume concrete is higher than that of F-1 concrete, and F _ S _ 2 is the best cross-section size, and the surface area of Fstack _ 2 pile is 1.53 times than that of small circular pile C _ (2) with equal cross-section area. The ultimate bearing capacity is 2.4 times higher than that of the pile, which shows that FSP _ 2 has good bearing capacity under the same concrete content, and the cross-section anisotropic effect is obvious, and the cross-section area of FSP _ 2 pile is 0.44 times that of large circular pile with the same circumference. The ultimate bearing capacity is 0.96 times higher than that of C-1 pile, but the bearing capacity of FSP _ 2 pile is 2.21 times of that of C _ S _ 1 pile, which shows a higher ratio of bearing capacity to price. The proportion of lateral friction of five star-shaped piles under various loads is over 80%, especially for F2 pile, which is above 90%. The research results can provide some theoretical support for the engineering application of five-star pile.
【作者單位】： 河南理工大學(xué)土木工程學(xué)院;浙江大學(xué)城市學(xué)院土木工程系;
【基金】：國家自然科學(xué)基金(No.51508166) 河南省教育廳科技攻關(guān)項(xiàng)目(No.14A560015)~~
【分類號】：TU473.1
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本文編號：1647210