RoadMesh路面加筋网本构模型研究

发布时间：2018-01-13 23:35

本文关键词：RoadMesh路面加筋网本构模型研究　出处：《长沙理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：为了准确分析RoadMesh路面加筋网的加筋机理,通过材料性能试验确定RoadMesh的力学性能参数,据此通过拟合分析其材料本构模型,并采用离散元法以试验数据进行校准验证,确定合理的RoadMesh数值仿真模型,为RoadMesh加筋沥青路面的理论研究提供借鉴。(1)采用自制夹具分别对RoadMesh各组成钢丝及纵、横向钢丝网面进行了室内拉伸试验,通过试验结果分析,得到了各材料的拉伸应力-应变关系曲线。同时,以弹塑性理论为基础,从工程应用出发,采用拟合计算描述了各材料的力学性能,建立了弹塑性应力-应变关系模型。通过对比各种材料的拟合曲线和实测曲线,确定了合适的RoadMesh本构方程。(2)采用离散元法和颗粒流远程交互弹塑性模型,建立了合理的RoadMesh离散元模型,同时通过试验数据校准和验证了数值仿真模型。结果表明,当应变修正系数为0.4和刚度修正系数为0.5时,RoadMesh在整个加载路径的数值模拟曲线与试验结果曲线基本吻合,从而确定了合理的RoadMesh数值模型,并通过数值仿真模型确定了当横向长度超过临界值后,RoadMesh的拉伸强度和拉伸率几乎不受尺寸变化的影响。(3)利用室内组合试件弯拉试验模拟沥青路面抗反射裂缝和抗差异沉降力学响应的影响规律。结果显示,对比未加筋模拟试验,RoadMesh加筋的抗反射裂缝模型和抗差异沉降模型的抗弯拉强度分别提高了46.10%和34.52%,抗弯拉应变分别增加了11.34%和13.09%,弯曲劲度模量分别增加了31.20%和18.93%。因此,RoadMesh路面加筋网对提高沥青路面抗反射裂缝和抗差异沉降都能起到很好的作用。总之,本文的研究为RoadMesh路面加筋网在沥青路面加筋工程中的机理分析和实际应用提供了科学依据。
[Abstract]:In order to accurately analyze the reinforcement mechanism of RoadMesh reinforced pavement, mechanical parameters of RoadMesh are determined by the material performance test, according to the analysis by fitting the material constitutive model, and using the discrete element method was used to determine the calibration and validation of experimental data, numerical simulation of the RoadMesh model, to provide reference for the theoretical study of RoadMesh reinforced asphalt pavement. (1) using the self-made fixture of RoadMesh steel wire and the longitudinal tensile test, indoor horizontal steel mesh, through analysis of test results, obtained the material tensile stress-strain curve. At the same time, based on the elastic-plastic theory, starting from the engineering application, the fitting calculation description the mechanical properties of different materials, establish elastic-plastic stress-strain relation model. Through the comparison of various materials of the fitting curve and the experimental curve, the constitutive equation of RoadMesh (right. 2) flow remote interactive elastoplastic model using discrete element method and particle discrete element model was built for RoadMesh reasonable, at the same time the test data to calibrate and validate the numerical simulation model. The results show that when the strain is 0.4 and the correction coefficient of stiffness correction coefficient is 0.5, RoadMesh simulation curves and experimental curves agree with the results in the numerical loading path, so as to determine the RoadMesh numerical model is reasonable, and the numerical simulation model to determine when the transverse length exceeds the critical value, influence the tensile strength and tensile modulus of RoadMesh is almost not affected by the change in size. (3) the use of indoor combined specimen bending test of asphalt pavement reflection crack resistance and simulation the differential settlement of the mechanical response of anti influence. The results showed that compared with the unreinforced simulation test, anti reflection crack model of reinforced RoadMesh and flexural strength of the anti settlement model respectively. Increased by 46.10% and 34.52%, 11.34% and 13.09% increase in flexural strain, bending stiffness modulus were increased by 31.20% and 18.93%. so RoadMesh pavement reinforced to improve the anti cracking and anti differential settlement can play a good role in asphalt pavement. In conclusion, this study provides a scientific basis for RoadMesh pavement Reinforced Asphalt Pavement Reinforcement Mechanism Analysis in engineering and practical application.

【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.2

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