基于板底脱空压浆处治前后力学行为对比分析

Comparative analysis of mechanical behavior before and after treatment of slab bottom void grouting

为探究脱空路面板压浆处治前后板底力学行为变化,本文通过建立ANSYS三维有限元水泥混凝土路面板底脱空及压浆处治模型,并模拟不同形式和程度的脱空与处治,对比分析压浆处治材料前后路面板弯沉及弯拉应力的变化,研究压浆前后各项相关指标变化规律。结果表明:在本文建模和模拟条件下,板底脱空可演化为三阶段:脱空尺寸在200～400 mm内为突变阶段,400～800 mm内为发展阶段,800～1 000 mm内为加速扩展阶段。经不同形式压浆处治后弯沉及弯拉应力均大幅度下降。当处治厚度较小时,其对路面板的影响程度较处治尺寸大;而当处治尺寸较小时,处治尺寸对路面板的影响更大。压浆材料模量的选择与基层材料模量相差在0～200 MPa范围内是合适的,否则将影响处治效果。

In order to explore the mechanics behavior of bottom plate before and after the grouting treatment,the paper established a threedimensional finite element model of cement concrete pavement through void and grouting,simulated different forms and degrees of cavitation and treatment,analyzed bending stress changes before and after the pulp material treatment deflection and bending of the road surface,and researched the relevant indicators before and after the grouting changes.The results show that the bottom of the board can be divided into three stages:the size of the void is a mutationwithin 200~400mm,a development within 400~800mm,and an acceleration within 800~1000mm.After different forms of grouting treatment,deflection and bending stress are greatly reduced.When the treatment thickness is smaller,the impact on the pavement slab is larger than that on the treatment pavement,while when the treatment size is small,the treatment size has a greater impact on the pavement slab.The modulus of the grouting material and the modulus of the base material in the 0~200MPa range is appropriate,otherwise it will affect the treatment effect.