Detail of JTJ 239-2005

Introduction of JTJ 239-2005

1 General Provisions 1.0.1 This code is formulated with a view to unifying the technical requirements for the application of geosynthetics for port and waterway engineering and ensuring the engineering quality. 1.0.2 This code is applicable to the design and construction of geosynthetics filtering layer, reinforced cushion, reinforced soil bank, slope protection with bagged concrete, mud-filled bag embankment, soft mattress for bottom protection in port and waterway engineering. 1.0.3 Single constant safety coefficient method is adopted for structural design in this code. 1.0.4 Special technical and economic appraisal shall carried out on the application of geosynthetics for major engineering and engineering with special requirements 1.0.5 The design and construction of the application of geosynthetics for port and waterway engineering shall not only meet the requirements stipulated in this code, but also comply with those in the current relevant ones of the nation. 2 Terms 2.0.1 Geosynthetics A generic term for geotextile, geomembrane, geocomposite, special geosynthetics and other high polymer materials used in civil engineering. 2.0.2 Geotextile A kind of water-permeable geosynthetics, which can be divided into woven geotextile and non-woven geotextile according to different manufacturing methods. 2.0.3 Woven geotextile A kind of cloth-shaped geotextile arrayed by fiber yarn or filament yarn in certain direction and then woven by machine; it can be divided into braided geotextile, machined geotextile and knitted geotextile according to different processing techniques. 2.0.4 Non-woven geotextile A kind of cotton-like or cloth-shaped geotextile arrayed by short fiber or filament yarn randomly or in a fixed direction and then winded and bonded by machine under hot or melting condition. 2.0.5 Geomembrane Relatively watertight membrane-shaped geosynthetics. 2.0.6 Geocomposite A kind of geosynthetics made of two or more geosynthetics. 2.0.7 Special geosynthetics A kind of geosynthetics produced by a special process and with a special purpose, including geomembrane bag, geogrid, geobelt and geonet. 2.0.8 Geomembrane bag Continuous or separate bag-shaped structural material which is fabricated with double-layer high-strength geotextiles and may act as a template for grouted concrete or mortar. 2.0.9 Geogrid Regular net-shaped geosynthetics formed by tensile strip and used for reinforcement; its mesh may be penetrated by surrounding soils and stones. 2.0.10 Geobelt Stripped tensile geosynthetics subject to extrusion and tension or reinforcement. 2.0.11 Geonet Mesh-knotted or mesh-tied net-shaped geosynthetics fabricated through extrusion or hot bonding. 2.0.12 Geotextile filtering layer Filter-inverted structural layer composed of single geotextile or a combination of geotextile and sandstone. 2.0.13 Geosynthetic reinforced cushion A cushion composed of reinforcing geosynthetics and sand or sandstone. 2.0.14 Reinforced soil bank A bank structure composed of wall surface structure, reinforced geosynthetics and filling. 2.0.15 Slope protection with bagged concrete A slope protection structure where concrete or mortar is grouted into geomembrane bag to form bagged concrete after curing. 2.0.16 Mud-filled bag embankment An embankment structure where sandy soil is filled into geotextile fabric bags to superpose filled bags. 2.0.17 Soft mattress A mattress structure for bottom or beach protection, composed of geosynthetics and ballasting material. 2.0.18 Gradient ratio A ratio of the hydraulic gradient where water flows vertically through geotextiles and 25 mm thick soil layer and the hydraulic gradient where water flows through upper-covered 50mm thick soil layer. 3 Basic Requirements 3.0.1 The geosynthetics for port and waterway engineering shall be selected according to engineering requirements, environmental quality and construction conditions. Such selection shall give consideration to the physical property, mechanical property, hydraulics property, durability and product form of geosynthetics and shall meet the following requirements. 3.0.1.1 The woven geotextile should be applied to reinforced cushion, slope protection with bagged concrete, mud-filled bag embankment as well as soft mattress for bottom and beach protection. 3.0.1.2 The non-woven geotextile should be applied to geotextile filtering layer. 3.0.1.3 The geomembrane bag should be applied to slope protection. 3.0.1.4 The geobelt should be applied to reinforced soil bank engineering. 3.0.1.5 The geonet should be combined with geotextiles and applied to reinforced cushion and geotextile filtering layer. 3.0.1.6 The geogrid should be applied to reinforced cushion and reinforced soil bank engineering. 3.0.1.7 The geocomposite should be applied to geotextile filtering layer, soft soil foundation stabilization and embankment anti-seepage engineering 3.0.2 Burying, covering and other protective measures should be taken for the application of geosynthetics. Under exposed application condition, anti-aging geosynthetics shall be selected. 3.0.3 The long-term load-carrying geosynthetics shall consider that its strength decreases with time. 3.0.4 The structural design load of geosynthetics may be selected according to the standard values stipulated in the current relevant standards and codes on port and waterway engineering. 3.0.5 Product certificate as well as test and inspection reports shall be provided for the site receiving of geosynthetics, and the product quality shall be inspected according to the design requirements and contract provisions. 3.0.6 The testing methods for the physical property, mechanical property, hydraulics property and durability of geosynthetics shall comply with relevant national current standards. 3.0.7 After site receiving, the geosynthetics shall be stored at a well-ventilated and shaded area and mustn't be exposed to sunshine.

Contents of JTJ 239-2005

1 General Provisions 2 Terms 3 Basic Requirements 4 Filtering Layer 4.1 General Requirements 4.2 Design 4.3 Construction 5 Reinforced Cushion 5.1 General Requirements 5.2 Design 5.3 Construction 6 Reinforced Soil Bank 6.1 General Requirements 6.2 Design 6.3 Construction 7 Slope Protection with Bagged Concrete 7.1 General Requirements 7.2 Design 7.3 Construction 8 Mud-filled Bag Embankment 8.1 General Requirements 8.2 Design 8.3 Construction 9 Soft Mattress for Bottom Protection 9.1 General Requirements 9.2 Design 9.3 Construction Appendix A Explanation of Wording in This Code Additional Explanations List of Chief Development Organizations, Participating Organizations, Chief Drafting Staffs, Chief Proofing Staffs and Administrative Staffs for This Code