梯田式填筑-降雨时序作用下沟谷区高填方地基变形与边坡稳定性分析  

Analysis of Deformation and Slope Stability of High-fill Foundation in Gully Area under Terraced Filling-rainfall Sequence

作　　者：成永亮 袁坤彬 卢渊 张振平 周永强[2] 袁维 付晓东[2,6] CHENG Yong-liang;YUAN Kun-bin;LU Yuan;ZHANG Zhen-ping;ZHOU Yong-qiang;YUAN Wei;FU Xiao-dong(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Social Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;China State Construction International Holdings Limted,Hong Kong 999077,China;Power Transformer Engineering Research Institute,China Electric Power Research Institute,Beijing 102401,China;School of Architecture and Civil Engineering,Shenyang University of Technology,Shenyang 110870,China;Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,石家庄050043 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071 [3]中国建筑国际集团有限公司,中国香港999077 [4]中国电力科学研究院有限公司输变电工程研究所,北京102401 [5]沈阳工业大学建筑与土木工程学院,沈阳110870 [6]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,石家庄050043

出　　处：《科学技术与工程》2023年第32期13944-13952,共9页Science Technology and Engineering

基　　金：国家自然科学基金(52179117);中国建筑国际集团有限公司科技研发项目(CSCI-2020-Z-21);道路与铁道工程安全保障省部共建教育部重点实验室(石家庄铁道大学)开放课题(STDTKF202103)。

摘　　要：山区城镇化建设力度逐步加大,削山填沟工程广泛分布,高填方地基沉降变形与边坡稳定性是安全建设重要的问题之一。基于典型沟谷区高填方梯田式填筑模型,结合流固耦合方法和极限平衡理论提出了梯田式填筑—降雨时序作用下沟谷区高填方地基变形与边坡稳定性分析方法,然后通过室内试验确定填筑体力学参数,分析梯田式填筑过程中高填方边坡内部响应规律,最后从多角度分析降雨时序作用下高填方地基变形与边坡稳定性时空演化规律,同时结合现场深部监测数据验证模拟结果的合理性,并将其运用到湖北省十堰市郧西县扶贫产业园项目。结果表明:填筑体随含石量增加,黏聚力总体呈波动式下降趋势,内摩擦角相对变化不大,饱和作用下试样抗剪强度具有显著弱化作用;填筑时步过程中,填筑层对边坡变形影响具有一定的时空限制范围;降雨时序作用下,填方区降雨影响深度为距地表12 m范围附近,结合现场长期监测数据,与模拟结果较为相似。研究成果能为削山填沟高填方边坡风险评估与地质灾害防治提供技术与实践经验。The construction of urbanization in mountainous areas is gradually increasing,and the mountain-cutting and gully filling projects are widely distributed.The settlement deformation of high-fill foundation and the stability of slope are one of the important problems in the safety construction.Based on a typical gully area high fill terraced filling model,a method was proposed to analyze the deformation of high fill foundation and slope stability in the gully area under terraced filling and rainfall sequence,combined with fluid solid coupling method and limit equilibrium theory.Then,the fill mechanics parameters were determined by indoor tests to analyze the internal response law of high fill slopes during the terraced filling process.Finally,the spatial and temporal evolution law of deformation and slope stability of high-fill foundation under the action of rainfall time sequence was analyzed from multiple perspectives,and the rationality of the simulation results was also verified by combining with deep monitoring data in the field,and the method was applied to Yunxi County Poverty Alleviation Industrial Park Project in Shiyan City,Hubei Province.The results show that with the increase of the stone content,the cohesion of the fill body generally shows a fluctuation downward trend,the internal friction angle keep constant,and a significant weakening effect is responsed in the shear strength of the sample.In the process of filling,the influence of filling layer on slope deformation has a spatiotemporal limit range.Under rainfall series,rainfall influence depth in the fill area is around 12 m from the surface.Combined with the long-term monitoring data of inclinometer,the results are similar to the simulation results.The research results can provide technical and practical experience for the risk assessment and geological hazard prevention of high fill slope in mountain cutting and filling gully.

关 键 词：高填方 梯田式填筑 降雨 时序作用 地基变形 边坡稳定 

分 类 号：TU433[建筑科学—岩土工程]