Abstract
In this paper, the failure mechanisms of large geotextile mats over soft soil are carried out through finite element analyses. A finite element model is generated and validated against centrifuge testing data and previously published data of numerical simulation. Parametric study is then carried out to investigate the geotextile tension distribution and the arrangement of crashed stone. Based on the parametric study, an optimized design considering the arrangement of rock berm and a special arrangement of large geotextiles was proposed to enhance the performance of the geotextile mats. The findings of this study can provide an engineering guidance for this new technique.
Highlights
In the wake of increasing incidents of structure failures at rivers and coastlines, construction of cofferdams has become an important disaster mitigation strategy (see Figures 1(a) and 1(b)) [1]
A few analytical solutions have been derived to investigate the configurations and tensile forces of the geosynthetic containers (Cantreet al. [3], Plaut [4], and Ghavanloo et al [5]).Yan and Chu [6] carried out a preliminary design method for the geotextile mat cofferdam and assessed the stability of the dike before construction using both numerical simulation and centrifuge test
Guo et al [7,8,9,10] proposed analytical methods to analyze the behavior of geosynthetic mattresses resting on rigid or deformable foundation. ese studies primarily focused on materials and deformations of geosynthetic tubes and mats but ignored the settlement of underlying soils
Summary
In the wake of increasing incidents of structure failures at rivers and coastlines, construction of cofferdams has become an important disaster mitigation strategy (see Figures 1(a) and 1(b)) [1]. Failure mechanisms of geotextile tubes or mats over soft clay have been investigated by analytical solution, numerical modeling, and field tests. A few analytical solutions have been derived to investigate the configurations and tensile forces of the geosynthetic containers [3], Plaut [4], and Ghavanloo et al [5]).Yan and Chu [6] carried out a preliminary design method for the geotextile mat cofferdam and assessed the stability of the dike before construction using both numerical simulation and centrifuge test. Zhu et al [11] carried out the parametric study to evaluate the slope stability of stacked geotextiles. A series of slope stability charts were derived for rapid evaluation of the feasibility of stacked geotextiles (Figure 1(c))
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