传递最大推力的不平衡推力法  

Imbalance thrust force method for transferring the maximum thrust force

作　　者：陈文胜 戴嘉宁 蒋茂林 李颖豪 梁瑶 CHEN Wen-sheng;DAI Jia-ning;JIANG Mao-lin;LI Ying-hao;LIANG Yao(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《岩土工程学报》2022年第1期181-186,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金面上项目(51778067)。

摘　　要：不平衡推力法因其计算模型简便,计算过程可以显式完成,并且可以计算边坡整体的滑坡推力,在边坡分析与设计领域应用较广。条分法力学模型是一静不定模型,经各种简化而产生现有的各种条分方法,其中包括不平衡推力法。而作为静不定模型,条分法理论上有无数个满足平衡条件的解。而从这无数解中,应有更加合理和更有代表性的解存在,如具有较小安全系数的解。根据不平衡推力法的思路,遵循极限状态法设计计算的原则,拟通过找到条间传递最大条间力也即最大推力作为解答。本文的解答在边坡取整体安全系数的前提下,确保条间剪力不超出其条间的抗剪强度,让条块之间以最大条间力进行传递。通过理论分析和算例计算表明:相较于传统不平衡推力法,本文方法在满足极限平衡条件的前提下,可求得边坡对应滑动面的更大的滑坡推力,并获得较传统方法更小的安全系数。本文工作是对传统不平衡推力法的一个重要和有益的改进。The imbalance thrust force method(ITFM) is widely applied in the field of slope analysis and design because of its simple model,explicit calculation process and ability to calculate the overall landslide thrust.Because the mechanical model of the slice method is a statically indeterminate model,the existing slice methods are derived from various simplifications,including ITFM.As a statically indeterminate model,the slice method theoretically has innumerable solutions satisfying the equilibrium conditions.Among these innumerable solutions,there are reasonable and more representative solutions,such as the solution with smaller safety factor.According to the idea of ITFM and following the principle of the limit state method for design and calculation,this study tries to find the maximum force between slices for ITFM solution,that is,the maximum thrust force.Under the premise of taking the overall safety factor of slope,the solution of this study ensures that the shear force between the slices does not exceed the shear strength between the slices,so that the maximum inter slice force can be transferred between the slices.The theoretical analysis and example calculation show that compared with the traditional ITFM,the improved method can obtain a larger landslide thrust of the corresponding sliding surface of the slope under the premise of meeting the limit equilibrium condition,and obtain a smaller safety factor than the traditional ITFM.This study is an significant and useful improvement on the traditional ITFM.

关 键 词：边坡 不平衡推力法 条间力 改进方法 

分 类 号：TU470[建筑科学—结构工程]