摘要
以S218公路沿线的杂填土施工为例,浅层杂填土可采用换填法处理,深厚软土可采用强夯法处理或注浆加固,强夯法的设计关键是夯击能、布置夯点、夯击间隔时间等,夯击能要结合杂填土需加固厚度确定,夯点要超出路基坡脚外至少3 m,每个夯点夯击5遍(4遍点夯、1遍满夯),夯击间隔时间不宜<4 min。注浆加固法的设计关键是注浆材料、注浆压力、注浆量等,注浆材料宜选择P·O 42.5普通硅酸盐水泥,水灰比控制在2:1,注浆压力不宜过大或过小,可取0.5~1.0 MPa,注浆量可按柱式扩散理论计算。经检测,杂填土地基经强夯、注浆处理加固后,承载力均>120 kPa,满足设计要求,可用于填筑路基。
Taking the construction of miscellaneous fill along S218 Highway as an example,the shallow miscellaneous fill can be treated by replacement method,and the deep soft soil can be treated by dynamic compaction method or grouting reinforcement,the key points of dynamic compaction design are tamping energy,tamping point layout and tamping interval,etc.The tamping energy should be determined in combination with the thickness of miscellaneous fill to be reinforced,and the tamping point should be at least 3 m beyond the toe of the subgrade slope,each tamping point is tamped 5 times(4 times point tamping,1 time full tamping),and the tamping interval should not be less than 4 min.Grouting material,grouting pressure and grouting quantity are the key points in the design of grouting reinforcement method.The grouting material should be selected as P·O 42.5 ordinary Portland cement,the water cement ratio should be controlled at 2:1,and the grouting pressure should not be too large or too small,take 0.5~1.0 MPa,grouting volume can be calculated by column diffusion theory.After testing,the bearing capacity of miscellaneous fill foundation is more than 120 kPa after dynamic compaction and grouting treatment,which meets the design requirements and can be used to fill subgrade.
作者
郭铖
GUO Cheng(Xiantao Highway Development Center,Xiantao,Hubei 433000,China)
出处
《黑龙江交通科技》
2025年第5期47-51,共5页
Communications Science and Technology Heilongjiang
关键词
杂填土
路基加固
强夯法
注浆法
miscellaneous fill
roadbed reinforcement
dynamic compaction method
grouting method
