加肋土工膜表面形态与界面剪切强度相关性研究

发布时间：2019-04-22 21:31

【摘要】：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。
[Abstract]:In order to study the effect of surface morphology of ribbed geomembrane on the interfacial shear strength between ribbed geomembrane and geotextile, based on fractal geometry theory, the surface fractal dimensions of different stiffened geomembrane were obtained by cubic covering method. Based on the original direct shear test results, the fractal dimension D and interfacial shear strength of different ribbed geomembrane are analyzed. The results show that the interfacial shear strength between ribbed geomembrane and geotextile increases with the increase of fractal dimension D. Therefore, fractal dimension can be used to evaluate the interfacial shear strength between geotextile and stiffened geotextile. The JRC-JCS model was modified by adding the coincident coefficient JMC and empirical coefficient 畏, and the quantitative relationship between the surface roughness coefficient JRC and the fractal dimension D of the ribbed geomembrane was obtained by replacing the results of the direct shear test of geotextile with ribbed geotextile and geotextile. On this basis, the empirical estimation formula of interfacial shear strength between stiffened geomembrane and geotextile is obtained. Finally, the interfacial shear strength is estimated by the empirical estimation formula of interfacial shear strength between ribbed geomembrane and geotextile, and the empirical formula is compared with the measured value of direct shear test. The results show that the calculated results are in good agreement with the experimental results, and the calculation accuracy and reliable performance of the derived formulas meet the requirements of engineering estimation.
【作者单位】：上海大学土木工程系;
【基金】：国家自然科学基金资助项目(51208293) 2012年度上海大学创新基金资助项目(sdcx2012042) 国家留学基金资助项目
【分类号】：TU531.7

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