An experimental study of the dynamic compaction method based on relay drainage in foundation treatment of the coastal backfill area

ZHANG Junjian; LI Peng; YIN Kunyu; LUO Yulei; GUO Man

doi:10.16030/j.cnki.issn.1000-3665.202104076

2022 Vol. 49, No. 1

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ZHANG Junjian, LI Peng, YIN Kunyu, LUO Yulei, GUO Man. An experimental study of the dynamic compaction method based on relay drainage in foundation treatment of the coastal backfill area[J]. Hydrogeology & Engineering Geology, 2022, 49(1): 117-125. doi: 10.16030/j.cnki.issn.1000-3665.202104076

Citation:

ZHANG Junjian, LI Peng, YIN Kunyu, LUO Yulei, GUO Man. An experimental study of the dynamic compaction method based on relay drainage in foundation treatment of the coastal backfill area[J]. Hydrogeology & Engineering Geology, 2022, 49(1): 117-125. doi: 10.16030/j.cnki.issn.1000-3665.202104076

An experimental study of the dynamic compaction method based on relay drainage in foundation treatment of the coastal backfill area

1.
China Geotechnical Co. Ltd., Hangzhou, Zhejiang 311401, China
2.
Qingdao Surveying & Mapping Institute, Qingdao, Shandong 266032, China
3.
Qingdao Geotechnical Foundation Engineering Company, Qingdao, Shandong 266032, China
4.
No. 2 Engineering Co. Ltd. of CCCC First Harbor Engineering Co. Ltd., Qingdao, Shandong 266071, China
5.
Qingdao Binhai Investigation and Surveying Co. Ltd., Qingdao, Shandong 266071, China

Fund Project: Geotechnical Co., Ltd.，Hangzhou，Zhejiang 311401, China; 2. Qingdao Surveying & Mapping Institute，Qingdao, Shandong 266032, China; 3.Qingdao Geotechnical Foundation Engineering Company，Qingdao, Shandong 266032, China; 4. No. 2 Engineering Company Ltd. of CCCC First Harbor Engineering Company Ltd., Qingdao, Shandong 266071, China; 5. Qingdao Binhai Investigation and Surveying Co., Ltd., Qingdao, Shandong 266071, China）

Received Date: 30 April 2021

Revised Date: 23 August 2021

Publish Date: 15 January 2022

Abstract

Abstract

The studies of foundation treatment methods are carried out for the special and complex foundation in the fill, saturated silty fine sand and silt in the coastal backfill area of the coastal zone of the Shandong Peninsula. Based on the economical and efficient dynamic compaction method, the concept of integrated combined drainage is put forward. The relay drainage system of the shallow and deep vertical drainage channels and their relay horizontal drainage channels are designed, and field tests are undertaken. The monitoring data show that under the dynamic compaction load, the relay drainage system can coordinate drainage as a whole, which can quickly discharge the groundwater to dissipate the excess pore water pressure. The rise of groundwater level and dissipation of pore water pressure caused by dynamic compaction can be basically eliminated in about 7 hours. With continuous precipitation, the surface settlement is 0.7%～2.0% of the thickness of the upper soil mass. Under the dynamic load of dynamic compaction, the surface soil is compressed to 8.7%～10.9% of the thickness of the upper soil. The soil settlement is about 5 ‰ and 3 ‰ of the soil thickness at the buried depth of 3～7 m, and 2 ‰ of the soil thickness is at the buried depth of 7～10 m. The test data show that in the effective depth of dynamic compaction, the effect of foundation treatment is obvious, the engineering properties and the degree of consolidation of foundation are improved. The surface bearing capacity and deformation modulus meet the design requirements, the average bearing capacity of silt below 4 m is slightly lower than the design requirements, and the average degree of consolidation of mucky soil is 77%. The monitoring data of one month after tamping shows that the surface subsidence is within 25 mm, which tends to be stable, the layered settlement and pore water pressure are stable and slightly decreased.
- coastal backfill area /
- complex foundation /
- relay drainage /
- dynamic compaction /
- well point precipitation /
- plastic drainage plate

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References

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