摘要
采用极限分析上限法,建立土质边坡坡面沉桩动态稳定性三维计算模型,研究沉桩力、桩土间横向力等对边坡动态稳定性的影响。通过算例计算,对整个沉桩过程中边坡抗滑稳定安全系数的变化规律及其内在机制进行深入研究,并分析桩径、沉桩位置、坡角对边坡抗滑稳定安全系数的影响规律。结果表明:沉桩力对边坡稳定性产生不利影响,导致沉桩前期边坡安全系数持续降低;桩体穿过破坏面后,边坡安全系数由于桩身的抗滑作用而显著提高。桩径越大,沉桩前期安全系数越低,其下降速度也越快,但桩体穿过破坏面后安全系数提升也越明显;沉桩位置越靠近坡顶,沉桩过程中安全系数下降速度越快,导致最危险点的安全系数越低;坡角越大,沉桩过程中整体安全系数越低。分析结果对于坡面沉桩的稳定性评估及设计施工具有一定参考价值。
A 3D rotational failure model for calculating the transient stability of a slope during pile driving was established based on the upper-bound limit analysis. The influences of the pile driving force and the lateral force between pile and soil on the slope stability were considered. The variation of the anti-slide safety factor of the slope during pile driving was analyzed in detail through examples. The parametric studies were carried out to explore the effects of pile diameter, pile location and slope angle on the anti-slide safety factor of the slope. The results demonstrate that the pile driving leads to a steady decrease of the safety factor during the earlier stage of pile driving and the safety factor increases significantly because of the anti-sliding effect of the pile body after the end of pile reaching the sliding surface. The greater the pile diameter is, the lower the safety factor is and the faster it drops during the earlier stage of pile driving. The closer to the top of the slope the pile location is, the faster the safety factor decreases and the lower the safety factor of the most dangerous depth is. The safety factor decreases dramatically with the increase of the slope angle during the whole process of pile driving.
作者
饶平平
赵琳学
李林
刘颖
RAO Pingping ZHAO Linxue LI Lin LIU Ying(Department of Civil Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China College of Civil Engineering and Architecture, Nanchang Institute Technology , Nanchang , Jiangxi 330099 , China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2017年第3期697-704,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金青年基金项目(51208301)
江西省科技厅青年基金项目(20161BAB216107)~~
关键词
边坡工程
坡面沉桩
极限分析上限法
三维破坏机构
边坡动态稳定性
抗滑稳定安全系数
slope engineering
static pile driving
upper-bound limit analysis
three-dimensional failure mechanism
transient stability of slope
anti-slide safety factor