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为了研究加肋土工膜表面形态对加肋土工膜与土工布界面剪切强度的影响,基于分形几何理论,采用立方体覆盖法得到不同加肋形式土工膜的表面分维数D。在原有直剪试验结果的基础上,对不同加肋土工膜分形维数D与界面剪切强度进行分析,经研究表明加肋土工膜与土工布界面抗剪强度随着分形维数D的增加而加强,因此可以运用分形维数来评测加肋土工膜与土工布的界面剪切强度。通过添加吻合度系数JMC以及经验系数η对JRC-JCS模型进行修正,代入加肋土工膜与土工布直剪试验结果中反算得加肋土工膜表面粗糙度系数JRC与分形维数D的定量关系,在此基础上得到加肋土工膜与土工布界面抗剪强度的经验估算关系式。最后,采用加肋土工膜与土工布界面剪切强度的经验估算关系式估算界面剪切强度,并将经验公式估算值和直剪试验实测值进行对比,结果表明:计算结果和试验结果吻合良好,所推导的计算公式计算精度和可靠性能满足工程估算的要求。
In order to study the effect of the surface morphology of the ribbed geomembrane on the interfacial shear strength of the ribbed geomembrane and the geotextile, the fractal dimension theory D of the geomembrane with different ribbed forms was obtained by using the cube covering method based on the fractal geometry theory. Based on the results of the original direct shear test, the fractal dimension D and the interfacial shear strength of different geomembrane geomembranes were analyzed. The results show that the interfacial shear strength of the geomembrane and geomembrane increases with the increase of the fractal dimension D And to strengthen, so you can use the fractal dimension to evaluate the ribbed geomembrane and geotextile interfacial shear strength. By adding the coefficient of coincidence JMC and the empirical coefficient η to correct the JRC-JCS model, the quantitative relationship between the surface roughness coefficient JRC and the fractal dimension D , On this basis, we get the empirical relationship between the shear strength of the reinforced geomembrane and the geotextile interface. Finally, the interfacial shear strength is estimated by using the empirical relationship between the interfacial shear strength of the reinforced geomembrane and the geotextile. The empirical formula is compared with the measured value of the direct shear test. The results show that the calculated results are in good agreement with the experimental results , The calculation accuracy and reliability deduced by the calculation formula can meet the requirements of engineering estimation.