摘要
泥岩高填方地基要解决的核心问题主要是湿陷沉降变形问题,而强夯法具有较大的单位压实功,可以提高填方压实质量,减少其发生湿陷沉降变形的几率。然而,现行有关设计标准对于泥岩高填方地基的分层强夯设计缺乏指导,对于夯点间距等重要强夯设计参数规定尚不统一。依托±800kV昆北换流站工程,开展了强夯方案技术经济比较和现场试验工作,为类似泥岩地基的分层强夯设计提供参考。技术经济比较表明,6000kN·m方案优于4000kN·m方案。现场试验表明,6000kN·m强夯地基承载力特征值可达200kPa,变形模量平均值超过30MPa;夯点间距分别为5m、6m时,6000kN·m的有效加固深度均达到8m,但后者夯间、夯点的密实度差异相对较大,地基均匀性较差。
The essential problem to be solved for the deep filled ground of mudstone is the collapsible settlement deformation, and with larger unit compaction work, the dynamic compaction method can improve the compaction quality and reduce the probability of collapsible settlement deformation. However, the layered design of deep filled ground of mudstone were without guidance of the current design standards, and the regulations for important parameters such as the tamping point spacing are not uniform. Based on the ±800 kV Kunbei Converter Station project, the technical and economic comparison and field test of dynamic compaction scheme were carried out, to provid reference for the design of layered dynamic compaction of similar mudstone foundation. The technical and economic comparison shows that the 6000 kN ·m scheme is better than the 4000 kN ·m scheme. Field tests show that the characteristic value of foundation bearing capacity of dynamic compaction ground can reach 200 kPa, and the average deformation modulus exceeds 30 MPa. When the ramming point spacing is 5 m and 6 m , the effective reinforcement depth of 6000 kN ·m both can reach 8 m, but as to 5 m, the difference of density between ramming point and outside is relatively large, and with poor foundation uniformity.
作者
何勇
贺瑞
陈建敏
张朋朋
HE Yong;HE Rui;CHEN Jianmin;ZHANG Pengpeng(South West Electric Power Design Institute Co.,Ltd.,Chengdu 610021,China;ChinaElectric Power Planning &Engineering Institute,Beijing 100120,China;CSG EHV Power Transmission Company,Guangzhou 510530,China)
出处
《四川理工学院学报（自然科学版）》
CAS
2019年第4期55-61,共7页
Journal of Sichuan University of Science & Engineering(Natural Science Edition)
关键词
泥岩
高填方地基
强夯设计
现场试验
夯点间距
mudstone
deep filled ground
dynamic compaction design
field test
tamping point spacing
