论文部分内容阅读
在加筋土工程中筋材与土的界面特性研究对加筋土的设计、计算有着直接影响。通过采用4种不同粒径的土与土工合成材料进行直剪试验,研究了筋材与土的界面剪切特性。研究发现:1)在相同大小的荷载作用下,随着土体粒径的增大,接触面间的咬合力、内摩擦角也增加,同时土体破坏时的剪应力峰值也随之明显增加;2)土与土工合成材料的摩擦系数比K均小于1,与土体本身之间的咬合力相比较而言,土工格栅咬合力有较大的提高,且随着土粒径的增大而增大,而土-土工布的咬合力却不是单调变化;当界面发生剪切破坏时,不同粒径的颗粒材料破坏时剪切位移值差距较大;3)加筋界面是软弱滑动面,因此要验算其抗滑稳定性;4)不同的土体要选择合适的加筋材料以达到较好的加筋效果。
In the reinforced geotechnical engineering, the research on the interfacial properties between the material and the soil has a direct influence on the design and calculation of the reinforced soil. By using four different sizes of soil and geosynthetics for direct shear tests, the interfacial shear properties of the reinforcement and soil were studied. The results show that: 1) Under the same load, with the increase of soil particle size, the bite force and internal friction angle between the contact surfaces also increase, and the peak shear stress of the soil failure increases significantly ; 2) The friction coefficient ratio between soil and geosynthetic material is less than 1, compared with the biting force of soil itself, geogrid bite force is greatly increased, and with the increase of soil particle diameter While the occlusal force of soil-geotextile does not change monotonously. When the interface is sheared and damaged, the difference of shear displacement value is great when the particle material with different particle size is destroyed. 3) Surface, so to check the stability of its anti-sliding; 4) different soil to choose the right reinforcement materials to achieve better reinforcement effect.