土体呈梯形分布的光滑直立型挡土墙土压力理论  

The soil pressure theory of a trapezoidal soil mass retained by a vertical wall with a smooth back

作　　者：慕青松[1] 王恺枫 张皓 MU Qing-song;WANG Kai-feng;ZHANG Hao(Key Laboratory of Mechanics on Disaster and Environment in Western China with the Ministry of Education,College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学土木工程与力学学院,西部灾害与环境力学教育部重点实验室,兰州730000

出　　处：《兰州大学学报（自然科学版）》2023年第4期455-459,467,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：金川集团有限公司横向课题项目(金科矿2019-06)。

摘　　要：尝试性地建立梯形土体的土压力理论(包括主、被动土压力),挡土墙被简化为光滑直立型.通过算例的数值分析发现,梯形土体的土压力理论给出的主、被动土压力均小于等于经典土压力理论Rankine公式和Coulomb公式的主、被动土压力,其差值在地表附近为0,当深度有一定增加时会出现,并随深度的增加而变大,且该差值在被动土压力中表现得更明显.结果表明,与新建立的关于梯形土体的土压力理论相比,Rankine土压力理论和Coulomb土压力理论会在一定程度上高估梯形土体的主、被动土压力.As an initial attempt,a new theory focused on the earth pressure in a soil mass with a trapezoidal shape retained by a vertical smooth wall was established,which consisted of two parts:active and passive earth pressures.Through the numerical analysis of an example,it was found that the active or passive earth pressure given by the new theory was always less than or equal to the active or passive earth pressure given by Rankine's and Coulomb's theories,the difference obtained from the latter minus the former equaled zero at a depth close to the soil's surface,but it started to grow with the increase in depth when the depth exceeded a certain value,which was shown to be more obvious for the passive earth pressure.The results showed that,compared with the new theory developed by us,Rankine's and Coulomb's theories would overestimate active and passive earth pressures of a trapezoidal soil mass.

关 键 词：梯形土体 光滑直立挡土墙 主动土压力 被动土压力 滑移角 

分 类 号：TU432[建筑科学—岩土工程]