在双向土工格栅单元的连接处,采用弹簧滑块模拟双向土工格栅的剪切面力学行为弹簧滑块的方向是基于双向土工格栅和围岩介质之间相对剪切位移方向的变化每个节点只有一个弹簧滑块 双向士工格栅单元的力学特性与粗糙网格和交叉连接筋相似。弹簧滑块传递双向土工格栅表面两侧整个区域的总剪力。同时,假定双向土工格栅两侧的有效侧向极限应力相等。利用双向土工格栅加固沥青路面,可以有效改善路面结构的应力分布,防止和减少沥青路面结构的应力分布,防止和减少沥青路面各种裂缝的发生,提高路面质量,延长路面使用寿命。
At the joint of the two-way geogrid element, the mechanical behavior of the shear plane of the two-way geogrid is simulated by using the spring slider. The direction of the spring slider is based on the change of the relative shear displacement direction between the two-way geogrid and the surrounding rock medium. Each node has only one spring slider. The mechanical characteristics of the two-way geogrid element are similar to the rough grid and the cross connecting bar. The spring slider transmits the total shear force of the whole area on both sides of the two-way geogrid surface. At the same time, it is assumed that the effective lateral ultimate stresses on both sides of the two-way geogrid are equal. Using two-way geogrid to strengthen asphalt pavement can effectively improve the stress distribution of the pavement structure, prevent and reduce the stress distribution of the asphalt pavement structure, prevent and reduce the occurrence of various cracks in the asphalt pavement, improve the quality of the pavement, and extend the service life of the pavement.
      土工格栅采用双向土工格栅,每延米纵向极限抗拉强度不小于25KN/m ,横向极限抗拉强度不小于35KN/m ,延伸率不大于13%;土工格栅网孔尺寸为30mmx40mm ,肋条截面为矩形。由于土 工格栅的抗拉强度大，可增加路堤的稳定性;格栅网眼的存在制约了土的横向移动,形成了良好的嵌锁作用,使土体具有较好的整体抗剪能力;土工格栅有一定的刚度使上面的负荷得到扩散,提高了地基的承载力。
The geogrid adopts two-way geogrid, the longitudinal ultimate tensile strength of each linear meter is not less than 25kn / m, the transverse ultimate tensile strength is not less than 35KN / m, and the elongation is not more than 13%; the geogrid mesh size is 30mmx40mm, and the rib section is rectangular. Due to the large tensile strength of geogrid, the stability of embankment can be increased; the existence of grid mesh restricts the lateral movement of soil, forming a good interlocking effect, so that the soil has a better overall shear capacity; the geogrid has a certain rigidity, so that the load on it can be spread, and the bearing capacity of the foundation can be improved.
       随着大家对土工格栅在土体中的作用机理认识的加深,土工格栅在恒定荷载下的蠕变逐步引起大家的重视。在对同种质控抗拉强度的不同材质、不同加工方式的土工格栅分别进行蠕变测试后,发现不同的格栅显示不同的测试结果,所以又开始对土工格栅在一定的应变要求范围内、一定的温度下、 在一定长的时间内所能承受的恒定荷载的蠕变强度高度重视 ,因为蠕变强度比质控抗拉强度更直观地体现了土工格栅的实际使用要求。
With the deepening of the understanding of the mechanism of Geogrid in soil, the creep of geogrid under constant load gradually attracts people's attention. After the creep tests of geogrids of different materials and different processing methods with the same quality control tensile strength, it is found that different geogrids show different test results, so the creep strength of geogrids under constant load which can bear in a certain range of strain requirements, under a certain temperature and for a certain period of time is highly valued, Because creep strength is more intuitive than quality control tensile strength to reflect the actual use requirements of geogrid.
       但土工格栅蠕变测试只是考虑了长期负载时格栅强度的衰减,而实际使用过程中施工、填料、环境等也会对格栅的强度产生影响，所以,实际使用填料的施工破坏、土壤酸碱度的影响、土壤微生物的影响、土工格栅连接件的影响等,也必须考虑考虑了这些因素以后,终才能确定我们的设计强度,然后用这个设计强度来进行加筋结构体设计,设计是否安全也是用这个设计强度来验算,看其内部稳定、外部稳定及总体安全系数是否满足要求,来确保加筋结构体的安全。
However, the creep test of geogrid only considers the attenuation of the strength of geogrid under long-term load, and the construction, filler, environment, etc. will also affect the strength of Geogrid in the actual use process. Therefore, the construction damage of filler, the impact of soil pH, the impact of soil micro organism, the impact of geogrid connector, etc. must also be considered after these factors are taken into account, Finally, we can determine our design strength, and then use this design strength to design the reinforced structure. Whether the design is safe or not is also checked by this design strength to see whether its internal stability, external stability and overall safety factor meet the requirements to ensure the safety of the reinforced structure.
       双向土工格栅的摊铺,按设计要求分层铺设土工格栅,摊铺方向是将格栅自台背沿路线纵向展开,并按设计长度截断。相邻两幅格栅应相互搭接,搭接宽度不小于20cm ,并用钢丝绑扎连为一体。若桥台与线路斜交,应将格栅靠桥台-端截成与斜交角相同的角度,保证格栅与线路走向平行。格栅上层筑土,双向土工格栅铺平、拉紧后开始填土,填料要求为无棱角的砂砾土,可用装载机从格栅边缘向台背方向填土, 要避免直接轮压格栅,格栅上层虚填厚度达到25cm后,可以上压路机进行碾压。碾压按照《公路路基施工技术规范》标准进行。
For the paving of two-way geogrid, the geogrid shall be laid layer by layer according to the design requirements. The paving direction is to unfold the geogrid longitudinally from the abutment back along the route, and cut it off according to the design length. The two adjacent gratings shall be overlapped with each other, and the overlapping width shall not be less than 20cm, and shall be tied and connected as a whole with steel wire. If the bridge abutment and the line are inclined, the grid shall be cut to the same angle as the skew angle near the abutment end to ensure that the grid is parallel to the line direction. The earth shall be built on the upper layer of the grid, and the filling shall be started after the two-way geogrid is paved and tensioned. The filling shall be gravel soil without edges and corners. The loader can be used to fill the earth from the edge of the grid to the back of the platform to avoid direct wheel compaction of the grid. After the virtual filling thickness of the upper layer of the grid reaches 25cm, the roller can be used for rolling. Rolling shall be carried out in accordance with the technical code for construction of highway subgrade.
       根据双向土工格栅的铺设宽度,下填料支撑双向土工格栅的设计要求在下支撑层形成双向土工格栅。双向土工格栅铺设,人工铺设上部填料,及时碾压,避免长期接触。有时浸渍压胶与表面沥青为自粘胶粘剂,使格栅与沥青路面紧密结合为- -体。由于双向工格栅联锁力网中的土石增加,它们之间的摩擦系数显著增加(高达08-10%) ,由于土体之间的摩擦,埋入士中的双向土工格栅抗拔力显著增加.从而使沥青混合料在压实状态下能够获得更好、更高的承载能力、变形传递性能和更小更好的荷载。因此,双向土工格栅是一种很好的增强材料。
According to the laying width of the two-way geogrid, the design of the two-way geogrid supported by the lower filler requires that the two-way geogrid be formed in the lower support layer. Two way geogrid laying, manual laying of the upper filler, timely rolling to avoid long-term contact. Sometimes, the impregnation press glue and the surface asphalt are self-adhesive adhesives, which make the grid and the asphalt pavement closely combined as a body. Due to the increase of the earth rock in the interlocking force network of the two-way geogrid, the friction coefficient between them increases significantly (up to 08-10%). Due to the friction between the soil, the pull-out resistance of the two-way geogrid embedded in the soil increases significantly, so that the asphalt mixture can obtain better bearing capacity, deformation transfer performance and smaller and better load under the compaction state. Therefore, bi-directional geogrid is a good reinforcement material.
       相信大家看完以上内容以后，大家应该对双向土工格栅的蠕变特性有所了解了，希望会对大家有所帮助吧。
I believe that after reading the above content, you should have some understanding of the creep characteristics of the two-way geogrid. I hope it will help you.
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