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按桥规方法推导了纯弯曲孔道的预应力摩阻损失公式,通过该公式在使用中产生的矛盾,指出了该公式的不合理性。在弹性接触分析的基础上,提出了接触正压力余弦分布的假设,推导出任一弯曲角度时的接触压力表达式及相应的摩阻力计算公式,并与均匀分布假设下的摩阻力计算结果进行了比较。结果表明:非均匀分布假设下的摩阻力更小,因此库仑摩擦原理在弯曲孔道预应力摩阻损失计算中的适用性问题需做进一步的研究。
According to the bridge gauge method, the formula of prestress friction loss of purely curved tunnel is deduced, and the irrationality of this formula is pointed out through the contradiction between the formula and its use. Based on the elastic contact analysis, the hypothesis of the cosine distribution of positive pressure is put forward. The contact pressure expression and the corresponding frictional resistance formula at any bending angle are deduced. The calculation results of the frictional resistance under the uniform distribution assumption Compare The results show that the frictional resistance under the assumption of non-uniform distribution is smaller. Therefore, the applicability of the Coulomb friction principle in calculating the frictional resistance loss of prestressed curved channels needs to be further studied.