考虑衰减滞后的边坡分层强度折减原理  

Delamination Strength Reduction Principle of Slope Considering Attenuation Hysteresis Effect

作　　者：侯世伟[1] 焦宏宇 韩俊艳[2] 张皓[1] 李艳凤 HOU Shiwei;JIAO Hongyu;HAN Junyan;ZHANG Hao;LI Yanfeng(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China;The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124

出　　处：《土木工程与管理学报》2023年第6期32-38,共7页Journal of Civil Engineering and Management

基　　金：国家重点研发计划(2018YFD1100404);北京工业大学重点实验室项目(2022B08);沈阳市中青年科技创新人才支持计划(RC220171)。

摘　　要：边坡破坏是一个渐进的过程。降雨、冻融循环、长期蠕变等侵蚀条件具有从土体表面到内部的区域渐进性,边坡破坏过程同时也具有从局部应变发展至贯通的变形渐进性。本文提出将区域渐进性与变形渐进性相结合的分层折减原理。该原理引入时间场变量来量化处理侵蚀条件的渗透作用与强度衰减作用的速度关系,并提出衰减扩散比(ASR)与衰减滞后比(AHR)的概念。研究不同AHR条件下的塑性屈服区演化过程、位移特征和潜在滑裂面的位置。研究表明:最终滑裂带的形成是坡面局部失稳与坡体整体失稳共同作用的结果,由坡面局部失稳滑裂带和坡体整体失稳滑裂带以及双带裹挟的滑带土体构成。随着AHR的增加,坡面局部失稳作用对坡体整体失稳作用的竞争更大,滑裂带位置更靠近坡面。当AHR大于某一阈值时,出现双带破坏模式。Slope failure is a progressive process.The erosion conditions such as rainfall,freeze-thaw cycle,and long-term creep possesses regional progressiveness from the surface of the soil to the inside,and the process of slope failure is also a deformable progressiveness from partial strain to transfixion.This paper proposes a delamination strength reduction principle combining the regional progressiveness and the deformable progressiveness.This principle introduces time-variable to quantify the velocity relationship between osmosis under erosion conditions and intensity attenuation effect,and comes up with the following concepts of attenuation spread ratio(ASR)and attenuation hysteresis ratio(AHR).The evolution of plastic yield zone,the displacement characteristics and position of potential slip surface with different AHR can be investigated under this principle.The research shows that the instability of partial slope surface and the integral instability of slope lead to the final slip zone.It is composed of the partial slope surface instability and integral slope surface instability,in addition to the slip soil enveloped by the slip surface mentioned above.With the increase of AHR,the instability of partial slope surface is much more competitive to the integral instability of slope,and the position of slip zone is closer to the slope surface.When the AHR is greater than a certain threshold,a double-shear band failure mode will emerge.

关 键 词：分层折减原理 双剪切带 衰减滞后 边坡 渐进破坏 

分 类 号：TU432[建筑科学—岩土工程]