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测试土工布及相关材料检测有哪些? What are the tests for geotextiles and related materials?

author:hongruiwei Release time:2021-01-11 13:04:16visits:549


Geotextile is a permeable geosynthetic material made from synthetic fibers through needle punching or weaving. Geogrids are divided into four categories: plastic geogrids, steel plastic geogrids, glass fiber geogrids, and polyester warp knitted polyester geogrids. Grille is a two-dimensional grid or three-dimensional grid with a certain height formed by thermoplastic or molded high polymer materials such as polypropylene and polyvinyl chloride. When used in civil engineering, it is called a geogrid. Geotextiles and geogrids are widely used geotechnical materials. In order to ensure their quality, what aspects of performance testing are generally required?


Introduce the relevant tests of geotextile and geogrid to you:


1. Tensile strength: In a tensile test, the large tensile stress experienced by the specimen until fracture is called tensile strength, which is referred to in academia as tensile strength.


2. Elongation rate: Elongation rate refers to the percentage of the total deformation of the gauge length segment of the specimen after tensile fracture compared to the original gauge length.


3. Tear strength: It is a term defined in a test method for determining the tear resistance of thin films or sheets. This method is a tearing test conducted on specimens with specified cracks on a specialized testing machine.


4. Breaking strength: The maximum top pressure that a geosynthetic material can withstand when uniformly and vertically pressed against the plane of the geosynthetic material using the cylindrical top rod of the CBR instrument.


5. Thickness: Used to test the thickness of geotextile composite materials under different pressures and specified compression times.

6、单位面积质量:裁取面积为10000平方厘米 的试样10块,将裁好的试样按编号顺序逐一在天平上称量,读数精确到0.01g;裁取有代表性的试样10块,试样尺寸不小于基准版的面积,将试样自然平放在基准板与压块之间,轻轻放下压块,使试样收到的压力为2MPa,接触开始计时,30s时读数,精确到0.01mm。

6. Mass per unit area: Cut 10 samples with an area of 10000 square centimeters, and weigh the cut samples one by one on the balance in numbered order, with readings accurate to 0.01g; Cut 10 representative samples with a size not less than the area of the reference plate. Place the sample naturally flat between the reference plate and the pressure block, and gently lower the pressure block until the sample receives a pressure of 2MPa. When in contact, start timing, and read within 30s, accurate to 0.01mm.

7、 渗透系数:渗透系数又称水力传导系数。在各向同性介质中,它定义为单位水力梯度下的单位流量,表示流体通过孔隙骨架的难易程度。

7. Permeability coefficient: Permeability coefficient, also known as hydraulic conductivity coefficient. In isotropic media, it is defined as the unit flow rate under a unit hydraulic gradient, indicating the difficulty of fluid passing through the pore framework.

土工格栅常规检测包括:外观、物理性能(包括:单位面积质量测定、幅度测定、网孔尺寸测定);力学性能(包括:条带拉伸试验 、接头/接缝宽条拉伸试验、粘焊点)。

Routine testing of geogrids includes: appearance and physical properties (including: mass measurement per unit area, amplitude measurement, and mesh size measurement); Mechanical properties (including strip tensile test, joint/seam wide strip tensile test, and solder joint).