沟谷斜坡段填方对建筑工程地基基础的影响研究
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摘要
以西南地区沟谷区域的某建筑工程项目为例,根据斜坡段新填土的几何学特征和运动学特征并结合现场施工条件,采用理论分析和数值模拟相结合的方法,研究了沟谷区域斜坡段填方对建筑工程基础的不利影响,计算分析土体和建筑基础结构位移、剪切应变分布规律。结果表明:新填土的参数不断减弱以及结构上方面荷载的增加都将导致填方后该工程区域土体和桩基位移、沉降、剪应变均有所增加;同时,针对斜坡段填方对建筑工程基础主要不利影响的表现形式,提出了填土体注浆加固、加强桩基等一些相应预防或处理措施。
This paper mainly takes a construction project located in the valley area of southwestern region as an example,according to the geometric and kinematic characteristics of the new fill of the slope section combined with the on-site construction conditions.The combination of theoretical analysis and unmerical simulation was used to study the adverse effects of the filling of the slope section of the valley on the construction engineering foundation.Calculate and analyze the displacement and shear strain distribution of soil and building infrastructure.According to the calculation results,the gradual weakening of the parameters of the new fill and the increase of the structural load will lead to an increase in the displacement,settlement and shear strain of the soil and pile foundation in the project area after the filling.In view of the manifestation of the main adverse effects of the slope section on the foundation of the construction project,some corresponding prevention or treatment measures such as grouting reinforcement and strengthening pile foundation are proposed,accumulated relevant experience for similar construction projects.
This paper mainly takes a construction project located in the valley area of southwestern region as an example,according to the geometric and kinematic characteristics of the new fill of the slope section combined with the on-site construction conditions.The combination of theoretical analysis and unmerical simulation was used to study the adverse effects of the filling of the slope section of the valley on the construction engineering foundation.Calculate and analyze the displacement and shear strain distribution of soil and building infrastructure.According to the calculation results,the gradual weakening of the parameters of the new fill and the increase of the structural load will lead to an increase in the displacement,settlement and shear strain of the soil and pile foundation in the project area after the filling.In view of the manifestation of the main adverse effects of the slope section on the foundation of the construction project,some corresponding prevention or treatment measures such as grouting reinforcement and strengthening pile foundation are proposed,accumulated relevant experience for similar construction projects.
引文
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[3]周宏磊,司进峰.立交桥挡墙基础整体稳定性及填方堆载沉降分析[C]∥第八次全国岩石力学与工程学术大会论文集.成都:中国岩石力学与工程学会,2004:5.ZHOU H L,SI J L.Analyses for foundation stability and settlement induced by upper soilfill of retaining wall[C]∥Chinese Society of Rock Mechanics and Engineering.Chengdu:Chinese Society for Rock Mechanics&Engineering,2004:5.
[4]陈金锋,宋二祥,徐明.强度折减有限元法在昆明新机场高填方边坡稳定分析中的应用[J].岩土力学,2011,32(增刊1):636-641,703.CHEN J F,SONG E X,XU M.Application of strength reduction FEM to stability analysis of high fill slope in Kunming new airport[J].Rock and Soil Mechanics,2011,32(S1):636-641,703.
[5]李新旺,甘鹏山,李国昌,等.山区复杂地形条件下高填方边坡稳定性分析[J].路基工程,2015(5):32-37.LI X W,GAN P S,LI G C,et al.Stability analysis of high fill slope in mountainous region with complicated terrain[J].Subgrade Engineering,2015(5):32-37.
[6]王永忠,赵有余,金勤胜,等.FLAC3D在高填方边坡稳定性分析中的应用---以贵州织金电厂4#冷却塔处“三面临空”填方边坡为例[J].电力勘测设计,2015(增刊1):141-143,174.WANG Y Z,ZHAO Y Y,JIN Q S,et al.Stability analysis of high filling slope using FLAC3D[J].Electric Power Survey&Design,2015(S1):141-143,174.
[7]李阳,曹启增,贺国元,等.黄土地区高填方段挡土墙变形区的数值模拟研究[J].路基工程,2017(1):7-12.LI Y,CAO Q Z,HE G Y,et al.Numerical simulation study on deformation zone of retaining wall in high fill section in Loess area[J].Subgrade Engineering,2017(1):7-12.
[8]车竞.山区高速公路高填方路基方案设计及填筑工艺研究[J].路基工程,2014(3):50-54.CHE J.On scheme design and filling process of high fill subgrade for highway in mountainous area[J].Subgrade Engineering,2014(3):50-54.
[9]吴俊,陈开圣,龙万学.高填方路基沉降变形有限元数值模拟[J].公路工程,2009,34(2):27-29,33.WU J,CHEN K S,LONG W X.Numerical simulation in finite element of the sedimentation of high filled roadbed[J].Highway Engineering,2009,34(2):27-29,33.
[10]武星博.高速公路高填方路基施工技术[J].道路工程,2016(3):34-35.WU X B.High-fill roadbed construction technology for expressway[J].Road Engineering,2016(3):34-35.