摘要
针对目前路基和堤坝工程中对填埋式涵洞竖向土压力计算不够准确、不能正确地进行涵洞结构设计的情况,采用有限单元法对填埋式涵洞的土压力进行了分析。结果表明,随着涵洞上覆填土厚度的增大,其顶部垂直土压力与其相应上覆土柱压力的比值即垂直土压力系数在逐渐增大,并趋于一个稳定值;涵洞两侧填土不均匀时,不均匀变形造成垂直土压力增大;基于不同压实填土层实测压缩模量换算确定的变形模量作为理想弹塑性模型参数,得到的垂直土压力系数计算值与实测值吻和较好。由于填土与涵洞存在竖向沉降差,垂直土压力系数在1.2～1.35变化。
The previous calculations of the vertical earth pressure of culverts in road subgrade or dike projects are often not accurate enough,which lead to inaccuracy in structure design and engineering problem.Aiming at this problem,FEM is adopted to analyze the earth pressure of embedded culvert.It shows that the coefficient of vertical earth pressure gradually increases to a stable value with the increasing of the filling height,and that when the modulus of soils on the two sides is heterogeneous,the uneven deformation leads to the increase of vertical earth pressure.Based on the parameters of the ideal elastoplastic model which are calculated with the testing compression modulus of filling soils under various compaction degree,the coefficient of vertical earth pressure is determined,which agrees well with the earth pressure by in-situ testing.Because there is difference between settlement of the filling and the culvert,the range of coefficient of vertical soil pressure is about 1.2～1.35.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第z1期4356-4360,共5页
Chinese Journal of Rock Mechanics and Engineering
关键词
土力学
涵洞
压缩模量
垂直土压力系数
soil mechanics,culvert,compression modulus,coefficient of vertical earth pressure
