西南山区机场高填方边坡反压护道优化设计

OPTIMIZED DESIGN OF LOADING BERM FOR HIGH FILL SLOPE OF AIRPORT IN MOUNTAINOUS AREA OF SOUTHWEST CHINA

针对西南山区机场高填方地基存在有限深度相对软弱土层的工程地质情况,提出单级反压护道的优化设计方法及优化设计中所涉及到的各类典型滑移面稳定安全系数的简化计算方法,并对其进行了证明及验证,分析了所提方法计算结果与强度折减有限元法的差别大小及方法的适用性。验证结果表明:所提方法计算的安全系数与有限元计算结果的相对误差均不超过12%;计算的反压护道断面尺寸相对误差不超过20%;应用于有硬壳层的工程地质条件或有反压护道的典型滑移面时,误差更小。

Aiming at the special engineering geology condition in the southwest mountainous area, where there is relatively soft soil with a finite thickness, an optimization design method for a single step loading berm is put forward. Simplified calculation methods of safety factors of various typical sliding surfaces, involved in the optimization design, are also proposed. Furthermore, the optimization design method and simplified calculation methods are proved and verified. Finally, the errors and applicability of the proposed methods are discussed. The verification results show that the relative errors of the methods, put forward to calculate the safety factor or size of the loading berm, are no more than 12% to 20% compared with the finite element method. Moreover, when applying the methods to the engineering geology condition with hard crust or typical sliding surface with loading berm, the relative errors of the methods are smaller than those under ordinary Conditions.