Offshore Cofferdam Construction Technology With Bagged Soil Solidification
- Jinfang Hou (Tianjin Port Engineering Institute Co., Ltd., CCCC First Harbor Engineering Company Ltd.) | Aimin Liu (Tianjin Port Engineering Institute Co., Ltd., CCCC First Harbor Engineering Company Ltd.) | Wenbin Liu (Tianjin Port Engineering Institute Co., Ltd., CCCC First Harbor Engineering Company Ltd.)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- Solidified soil, geotextile bags, cofferdam, Strength
- 1 in the last 30 days
- 2 since 2007
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The construction of reclamation works, artificial islands and docks has increased, it is necessary to build a lot of seawalls and embankments. Embankments construction need huge of sand and stone. This method is neither environmental nor economic. Underwater silt resources are cheap to build embankments. The soft seabed soil mix with stabilizing agent (e.g. cement) are filled into large-size geotextile bags, the bags are placed by layers to form an embankment. This paper focuses on the engineering characters of bagged soil with low dosage of cement and the influence factors of strength. The bagged soil has a higher shearing capacity and higher water content. The geotextile bag has good integrity. Meanwhile, a mixing system and a filling system of construction technology for bagged soil solidification were established. The application of construction technology has made a good embankment with bagged soil solidification.
With the development of economy, more and more artificial islands and harbors are needed, and lots of seawalls and causeways are built. The seawalls and causeways are built by riprapping or hydraulic reclamation in traditional way. Masses of sand and gravel are required by using this construction method. For the area shorting of sand and gravel, this construction method makes the rising of the engineering cost. While for the area with much sand and gravel, this construction method will harm the local environment. The bagged soil solidification technique is an engineering method that direct digging the underwater soft soil, injecting the soil stabilizer (such as cement), mixing the soil and soil stabilizer by mechanical agitation until forming flowing mixed soil, filling this mixture material into the large geotechnical mold bag, then placing the bags into position to forming the seawalls or causeways (Liu 2009, Liu 2008). This construction technique can save lots of engineering material cost, reducing the damage of the waves on the cofferdam especially in the cofferdam forming period. Therefore, it is necessary to study the offshore cofferdam construction technology with bagged soil solidification.
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