| 摘要: |
| 珠江三角洲某高速公路路基采用７．０ｃｍ砂井排水堆载预压加固处理，测试资料分析表明加固效果显著。土体固结度达到８０％时所需的预压时间约为原设计时间的１／３倍；合理加密砂井间距对孔压消散，加快土体固结是十分有利的；排水砂井除排水作用外，还起到竖向加筋抗滑作用。但施打砂井后，土体扰动引起土体抗剪强度降低是非常可观的，工程学术界和广大现场施工人员应予以重视。 |
| 关键词: 袋装砂井,高速公路软基,地基处理,固结度,抗剪强度 |
| DOI： |
| 分类号:TV6 |
| 基金项目: |
|
| Analysis on an expressway soft ground improved by packed drains in Pearl River delta |
|
Cui Bohua
|
|
Nanjing Hydraulic Research Institute
|
| Abstract: |
| This paper discussed the result of soft ground improvement of an expressway located in Pearl River delta and its foundation was treated by preloading combined with packed drain of a diameter of 7 cm. Testing and monitoring results showed that the adopted method of ground treatment was very effective, so the preloading time when degree of consolidation reach 80% was reduced by 1/3 as compared with the design anticipation. Moreover, appropriate decrease of packed drain spacing was useful to the pore pressure dissipation and soil consolidation. Packed drains also have a vertical reinforcement and anti slide effect besides the drainage. Soil shear strength has a significant decrease due to disturbance after construction of the packed drains, which should be seriously considered for practice technicians and academic authorities. |
| Key words: packed drain, soft ground of expressway, ground treatment, degree of consolidation, shear strength |
