水位骤降条件下水工挡土墙的抗倾覆稳定计算方法  

Calculation method of anti-overturning stability of hydraulic retaining wall in condition of rapid drawdown of water level

作　　者：王全前 WANG Quan-qian(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi'an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,陕西西安710043

出　　处：《水运工程》2020年第11期138-141,165,共5页Port & Waterway Engineering

摘　　要：现行规范中采用单一安全系数法计算挡土墙抗倾覆稳定安全问题,并未指出水压力是作为倾覆力或是稳定力。针对不同的水压力计算方法对抗倾覆稳定安全系数影响很大的问题,根据单一安全系数法的计算原则,通过具体算例将规范方法与常用设计软件计算结果进行对比,并给出建议公式。结果表明,应将挡墙两侧水平水压力的差值和基底渗透压力作为荷载,墙前水位线下采用浮密度计算的挡墙自重作为抗力,以使计算的抗倾覆稳定安全系数能够更真实合理地反映工程安全度水平。The single safety coefficient method is used to calculate the anti-overturning stability and safety of hydraulic retaining wall in the current specification,without pointing out whether water pressure is an overturning force or a stability force.Aiming at the problem that the different calculation methods of water pressure have a great influence on the anti-overturning stability and safety coefficient,according to the calculation principle of single safety coefficient method,this paper compares the calculation results of the specification method and commonly used design software by specific computation example,and obtains the suggested formula.The results show that in order to make the calculated anti-overturning safety coefficient truly conform to the engineering safety level,it should regard the difference between the horizontal water pressure on both sides of the retaining wall and basement seepage pressure as the load,and weight of the retaining wall calculated by buoyant density below the water level in front of the wall as the resistance force.

关 键 词：水工挡土墙 水位骤降 水压力 抗倾覆稳定计算 

分 类 号：U617.4[交通运输工程—船舶及航道工程]