强夯半置换法在工程中的应用

Application of Dynamic Compaction Half Substitute Method to Engineering

强夯置换法或强夯半置换法利用动力固结原理,通过在夯坑中加硬质粗颗粒填料,建立排水通道,使地基土夯坑周围与夯坑底的孔隙水就近转移,加快土层固结。本文结合昭通换流站采用强夯半置换法处理高含水率粘土地基的应用,分别对强夯理论,方案选择,夯点布置,强夯处理深度等进行了论述与实践验证。换流站强夯场地碎石掺和比例为36%,经6个月的强夯后,平均地基承载力由160 k Pa提高到220 k Pa;压缩模量由6 MPa提高到15 MPa;平均含水率由36%降到24%;一年内场地沉降观测最大不超过10 cm。最后结合本工程实践经验,对强夯强夯半置换法在类似工程中应用提出一些建议。

Through hard coarse particle fillers are added into the tamper hole for building drainage channel, dynamic compaction replacement method or dynamic compaction replacement method make the pore water of the foundation soil to divert and to speed up the soil consolidation. Dynamic compaction half replacement method is used to deal with the application of high moisture content of clay foundation in zhaotong dc converter. Theory of dynamic compaction, scheme selection, arrangement of tamping points, dynamic compaction treatment depth, etc are discussed in this paper in combination with application of dynamic compaction replacement method in Zhaotong dc converter. The gravel content of converter station site is 36%. After six months of construction, the average foundation bearing capacity and compressive modulus are increased from 160 k Pa to 220 k Pa and from 6MPa to 15 MPa respectively; the average water rate is from 36% down to 24%; the largest settlement observation site within one year does not exceed 10 cm.Finally, some suggestions are made to guide the similar projects.