基于扩展有限元模型的土工布防荷载型反射裂缝影响分析

doi:10.13229/j.cnki.jdxbgxb201703011

摘要/Abstract

摘要：

运用ABAQUS软件建立三维扩展有限元模型(XFEM),研究了荷载型反射裂缝的扩展规律和土工布的防反特性和机理,探究了土工布拉伸模量和布设位置对防反性能的影响。使用材料试验系统开展重复加载试验验证了扩展有限元模型的有效性。分析结果表明:荷载型反射裂缝的扩展可分为4个阶段;土工布拉伸模量越大,裂缝扩展越慢,且随着裂缝的扩展,裂尖应力强度因子逐渐减小,裂缝扩展内动力不足;拉伸模量为100 MPa时最为经济有效;土工布长期受力状况不随模量变化而出现较大变化,土工布在裂缝早期发挥更大作用;土工布布设层位越高,裂缝扩展长度越大,位于基层顶面时能吸收最多的集中应力,防反效果最优。

关键词: 道路工程, 土工布, 荷载型反射裂缝, 扩展有限元模型, 应力强度因子

Abstract:

An extended finite element model (XFEM) was constructed by ABAQUS to investigate the propagation of the traffic induced reflective cracking, and the anti-cracking characteristics and mechanism of geotextile. The influence factors of tensile modulus and placement location of the geotextile were analyzed. A repeated loading test on the material test system was conducted to validate the XFEM model. It is shown that the crack propagation induced by repeated loading can be classified into four stages. The larger the tensile modulus of the geotextile is, the slower the crack propagation will be, the stress intensity factor of the crack tip decreases and the internal force for crack propagation is insufficient as the crack propagates. The most cost-effective tensile modulus of geotextile is 100 MPa. Long-term force conditions of the geotextile will not change with the tensile modulus, and the geotextile plays a greater role in the early stage of crack propagation. Geotextile placed at a higher location, the crack length is bigger. Geotextile placed on the top of base course will absorb most concentrated stress to have the best cracking resistance.

Key words: road engineering, geotextile, traffic induced reflective cracking, extended finite element model, stress intensity factor

中图分类号:

U416

蔡氧, 付伟, 陶泽峰, 陈康为. 基于扩展有限元模型的土工布防荷载型反射裂缝影响分析[J]. 吉林大学学报(工学版), 2017, 47(3): 765-770.

CAI Yang, FU Wei, TAO Ze-feng, CHEN Kang-wei. Influence analysis of geotextile on reducing traffic induced reflective cracking using extended finite element model[J]. 吉林大学学报(工学版), 2017, 47(3): 765-770.

参考文献

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