Field Test Study on Treatment of Dredged Soil with Cotton Straw
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TECHNOLOGY AND WORK PRODUCTION FIELD TEST STUDY ON TREATMENT OF DREDGED SOIL WITH COTTON STRAW
UDC 624.138.231 Xiaojuan Yu,* Chao Liu, Fenglin Lu College of Civil Engineering, YanCheng Institute of Technology, YanCheng, Jiangsu, China *Corresponding author Email: [email protected].
A new method for treatment of dredger fill was proposed to address its low bearing capacity, high consolidation cost, and long treatment duration. In this method, cotton straw is used as both the draining and reinforcement material. Specifically, cotton straw bundles are driven into the dredged soil and vacuum preloading is then performed. Subsequently, environmentally friendly grout is poured into the cotton straw bundles, and solidified vertical reinforcements are thus formed, allowing dredged soil to be treated. Design parameters for the cotton straw draining were obtained from previous laboratory test. Based on a real-world project, a field test was performed to study treatment of dredged soil through cotton straw drainage and reinforcement, and a comparison was drawn with the traditional cement mixing vertical reinforcement method. The vacuum degree, settlement, and water content of reinforced soil suggested a good ability of cotton straw drainage to solidify dredged soil. The static load test indicated that vertical reinforcement after grouting demonstrated better strength than cement reinforcements. This study provides new insights into the treatment of dredger fill and can broaden the application of cotton straw and also reduce environmental pollution caused by cotton straw burning.
1. Introduction A large amount of agricultural wastes such as bulrush, flax, coconut fiber, bamboo and straw are produced every year [1]. If not properly processed, they may have negative effects on the environment. For example, in November 2016, straw burning during fire cultivation in India resulted in the formation of haze, which caused a public panic. The burning of coal and straw in China led to heavy pollution in Northeast China. These events are just the "tip of the iceberg" of the environmental pollution problems caused by the extensive disposal of agricultural wastes in large agricultural countries. Therefore, the appropriate disposal of agricultural wastes and broadening their application has become urgent. Much effort is currently focused on expanding the application of agricultural wastes, for instance, the development of continuous sisal fiber reinforced composites, which allows the design of thin walled elements with high strength in tension and compression [2]. The agricultural waste fibers are tested for use as Limited Life Geotextile (LLG) and can be applied for temporary roads over soft land as well as for basal embankment reinforcement [3]. As a kind of agricultural waste, straw can be used as reinforcement material in geotechnical engineering applications because of its excellent properties. Barley straw has been used to reinforce clay and sandy soil [4]. Rice straw has been applied to strengthen and improve Kuttanad clay [
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