Abstract
The further development of land reclamation, port waterway, and wharf construction brings about proper treatments of dredger fill silt, while huge amounts of rice straw set aside in China argument rational disposal every year. Therefore, rice straw is bundled up as ropes, which represent as drainage body and reinforcement, to make eco-friendly treatment for dredger fill silt. This paper investigates the mechanical properties and validity of rice straw rope as certain treating material of dredger fill silt through a series of pull-out test, mass loss test, and tension test on specimens with different water contents and dry densities. The results reveal that peak value of interfacial shear strength rises with the increase of normal stress at the same immersion time, and in particular, it rises by up to 250.0% when the normal stress is 40 kPa. The tensile force of rice straw rope increases slowly with the rise of tensile displacement, and the failure mode changes from brittle to ductile with the rise of immersion time, which witnesses first rapid back slow degradation trend. The proper interfacial shear strength, tensile force, and reasonable degradation rate of rice straw rope make it ideal in drainage and consolidation of dredger fill silt.
Highlights
With the development of agricultural science and technology in China, crop straw resources are becoming more and more excessive
Tension test, and pull-out test were conducted to analyze the interfacial mass loss, tensile properties, and interface characteristics of rice straw rope. e objective of this paper is to study the properties and mechanics of rice straw rope through tests and provide a theoretical basis for treating dredger fill silt with rice straw rope
Based on the results, including pull-out test of rice straw rope with dredger fill silt, mass loss test, and tensile test of rice straw rope, the following conclusions may be drawn: (1) When immersion time increased from 5 days to 60 days, the peak shear strength of the interface between straw rope and dredger silt decreased by 23.2%, 34.9%, 33.4%, and 22.8% under normal stress of 20, 40, 60, and 80 kPa, respectively. e peak value of interfacial shear strength rises with the increase of normal stress. e increase of normal stress can significantly improve the interface shear strength of rice straw rope and silt
Summary
With the development of agricultural science and technology in China, crop straw resources are becoming more and more excessive. As an effective technology to improve soil mechanism, reinforced soil has been widely used in road engineering construction and other fields. In the analysis of soil internal stability and interface interaction, pull-out test seems to be the most widely used method due to its simplicity and usability [29]. In order to investigate the tensile strength of reinforced soil, tension tests are necessary. When rice straw is selected as vertical drainage body, the straw acts as reinforced material. Tension test, and pull-out test were conducted to analyze the interfacial mass loss, tensile properties, and interface characteristics of rice straw rope. E objective of this paper is to study the properties and mechanics of rice straw rope through tests and provide a theoretical basis for treating dredger fill silt with rice straw rope Tension test, and pull-out test were conducted to analyze the interfacial mass loss, tensile properties, and interface characteristics of rice straw rope. e objective of this paper is to study the properties and mechanics of rice straw rope through tests and provide a theoretical basis for treating dredger fill silt with rice straw rope
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