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Geocell-reinforcement in ground improvement is being used very extensively in present days. It is a three dimensional honeycombed confinement system, made of geosynthetics, which significantly improves the bearing capacity of soft soils, specially, in foundations, and pavements applications. Apart from improving the soil strength, it has also been...
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... is further reported that the performance of the geocell-reinforced foundation is magnified with the provision of an additional planar geogrid placed at the bottom of the geocell-mattress ( Dash et al., 2001;Sitharam et al., 2007, Biswas et al., 2015. Table 1 is summarizing the optimum values after normalized with footing diameter (D) or footing width (B). Stiffness of Geogrid As high as possible ID of in-filled sand (%) As high as possible ...
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Citations
... Các tấm HDPE sau khi được liên kết với nhau khi kéo ra sẽ tạo thành các ô lưới. Các cơ chế gia cố chung của ô địa kỹ thuật là giữ đất đắp ổn định trong các ô lưới, chống lại lực cắt dưới tác dụng của tải trọng [19]. Các ô được hàn với nhau tạo thành một khối đồng nhất, khi đó tải trọng thẳng đứng tác dụng lên nền đường thay vì gây ra mặt trượt ngay dưới vị trí tải trọng tác dụng thì sẽ tạo ra mặt trượt ở lớp đất sâu hơn. ...
Tóm tắt Nghiên cứu này giới thiệu bổ sung giải pháp đắp nền bằng cát biển có sử dụng vải địa kỹ thuật để gia cố, giúp hạn chế được các đặc tính dễ bị rửa trôi, mất ổn định cục bộ của cát biển. Bên cạnh đó, nghiên cứu cũng tiến hành kiểm toán ổn định của nền đường với các giải pháp khác nhau, chiều cao đắp khác nhau (H đ = 3, 6, 12 m). Nghiên cứu chỉ ra rằng, giải pháp đắp nền đường bằng cát biển gia cố vải địa kỹ thuật có hệ số ổn định cao hơn so với giải pháp đắp bằng đất đắp chọn lọc. Trong quá trình thi công thực tế, cần có so sánh luận chứng về kinh tế-kỹ thuật để lựa chọn được giải pháp đắp phù hợp. Đồng thời, cần phải có thêm các nghiên cứu để xác định khả năng nhiễm mặn của môi trường xung quanh khi sử dụng cát biển đắp nền đường trước khi áp dụng thi công thực tế.
... The functions of geosynthetics are reinforcement, drainage, filtration, separation, containment, etc. [4,5]. Several researchers reported that the geocell performs better as reinforcement to improve subgrade soil bearing capacity against other forms of geosynthetics [6][7][8]. Geocell is an interconnected three-dimensional cell filled with soil, sand, or aggregate [2,9]. It can be formed from polymeric or natural materials by bodkin joint, welding, or stitching [10][11][12]. ...
... Geocells filled with mix A and sand had shown a comparatively lower load-bearing capacity and failed due to the geocell's partial failure and particles squeezing out under the loading plate. The loadcarrying capacity was observed increasing due to the basal mat's deep beam effect and tensile membrane mechanism [6,[46][47][48]. Geocell also prevents lateral displacement of the infill material and enhances the infill material's shear angle [13,18,[49][50][51][52]. ...
Road construction and maintenance over a soft subgrade are challenging tasks. In the last few decades, polymeric geosynthetic materials are used to reinforce weak subgrade for better durability and cost-effectiveness. Natural geosynthetic materials such as bamboo, jute, and coir, have the potential for road construction and can be used in place of polymeric geosynthetics. In this present study, model plate load tests were performed to evaluate jute and bamboo geocell performance with an additional basal mat overlaying soft subgrade for the unpaved roads. The influence of infill material was studied with three different types of infill materials, i.e., sand, crushed aggregates, and Recycled Asphalt Pavement (RAP). Further, the size effect of infill material was studied by preparing three different crushed aggregate mixes (i.e., mix A, mix B, mix C) using the Fuller method of gradation. For the unreinforced and geocell reinforced system, the load-bearing capacity was found maximum with RAP and minimum with sand. Further, with an additional basal mat, the load-bearing capacity was maximum with mix C. The improvement factor (IF) with jute geocell was found in the range of 4–14.6 and enhanced to 5.1–18 with additional use of jute mat. However, using bamboo geocell, IF was found in the range of 5.1–16.9 and enhanced to 9.3–26.9 with additional use of the bamboo mat. The contribution of both types of geocell reinforcement was found maximum with sand and minimum in RAP as infill material. However, the contribution of the mat was found maximum with mix C and RAP for jute geocell and bamboo geocell, respectively. The infill material size effect was found negligible beyond mix B (i.e., the maximum size of aggregate 25 mm). The performance of the bamboo geocell was observed superior to the jute geocell. RAP and crushed aggregate mixes (mix B and mix C) are found as preferable infill materials of the geocell for maximum bearing capacity.
