加筋土筋土界面特性分离式试验研究

摘要

This study made a separation test study on reinforcement-soil interface of reinforced earth through the geo-grid drawing test and geo-grid tensile test. The test results show that:Both the clay shear friction strength and the geo-grid drawing strength increase with the normal stress increasing;both of their strength en-velopes are straight lines,though the interface between warp knitted polyester geo-grid and soil is a weak strength surface of reinforced soil;the tensile strength and the strength proportion of the geo-grid in the drawing test both increase with the normal stress increasing,corresponding to the 25~100 kPa of the normal stress range;the geo-grid tensile strength range is 1.22~6.44 kPa and the proportion range is 11.86%~11.27%. This paper concludes that the reinforced soil resistance deformation ability can be effectively improved by increasing a cer-tain amount of coarse particles in filled earth,taking corresponding measures to make the geo-grid fixed and clamped more stably,giving full play to the tensile strength of geo-grid and by adopting some measures to en-sure the geo-grid node strength.%选择工程常用的经编涤纶双向土工格栅和粘土分别作为加筋土的加筋材料和填料，通过室内拉拔试验和格栅拉伸试验对加筋土的筋土界面连接特性作分离式试验研究。试验结果表明：粘土直剪摩擦强度和加筋土格栅拉拔摩擦强度随法向应力增大而增大，其强度包线均是一条直线，但是经编涤纶格栅与填土界面是一薄弱面；格栅在拉拔试验过程中其拉伸强度和所占比重均随着法向应力的增加而增加，法向应力25~100 kPa变化范围格栅拉伸强度范围是1.22~6.44 kPa，所占比重范围是11.86%~11.27%；增加一定量粗颗粒的填土；采取相应措施更加牢靠的夹持固定加筋格栅，充分发挥格栅的拉伸强度，采用相应措施确保节点处的强度，将会有效提高加筋土的抵抗破坏变形能力。