送电线路掏挖基础抗拔力理论计算公式修正

依据《土体抗拔性能的试验研究及其理论分析》中模型试验结果及相应的计算条件,对土体抗拔力理论计算公式进行了重新推导,发现原文中的总剪阻力计算表达式存在一定的笔误,并采用Matlab6.5计算程序对所推导公式作了验证,结论与推导结果相一致,从而得到更正的土体极限抗拔力理论计算公式,满足电算的要求。这一公式目前已应用于新基础规范中。但新规范中通用公式与查表公式计算得到的剪阻力相差较大,对规范中A1、A2的查找表还需做进一步的验证工作。

Modification of Theoretical Calculation Formulas on Withdrawal Resistance of Undercut Foundation for Transmission Line

Pursuant to model test result and corresponding calculating conditions as stipulated in "Test Research and Its Theoretical Analysis for Withdrawal Resistance of Soil Mass",this paper undertakes re-deduction of the formula for theoretic calculating of withdrawal resistance of the soil mass to find some errors in the expressions in calculating the total uplift bearing capacity in the original article.Verification is done on the formulas derived by Matlab 6.5 calculating program to certify that calculating results are consistent,and result in a modified theoretical calculation formula of ultimate withdrawal resistance of soil mass,which meets with requirements for computer calculation.This modified formula has ready found use in the new foundation specification.However,with regard to total shearing resistance,deviations exist between the derivation arrived from the general formula and that from the calculation sheet in the new version of the specification,further verification on sheets A1,A2 in the specification should be carried out.