公路填石路基压实工艺优化方法及效果评价

来源期刊:中南大学学报(自然科学版)2021年第7期

论文作者:李盛 田文迪 刘玉龙 郜梦棵

文章页码:2360 - 2372

关键词:道路工程;填石路基;数值模拟;压实工艺;沉降观测

Key words:road engineering; rockfill subgrade; numerical simulation; compaction technology; settlement observation

摘    要:基于弹塑性力学理论和振动压实基本原理,通过有限元软件,对振动轮质量、激振力、振动频率和行驶速度这4种参数在2种控制水平下的16种填石路基振动压实工况进行数值模拟。综合考虑各种压实工况下最大压应力、有效压实深度、路表沉降的数值模拟结果及排序,确定优选的压实工况组合。通过便携式落锤弯沉仪(PFWD)对试验路段填石路基回弹模量进行测试和分析,并结合埋设的电感式沉降计跟踪观测结果。研究结果表明优选的压实工况组合如下:振动轮质量为11 t和13 t的2种压路机,优选激振力为400 kN,振动频率为28 Hz,行驶速度为4 km/h。在此优选压实工况组合下在试验路段碾压施工,孔隙率和沉降差的检测结果均满足规范要求,且压实效果与数值模拟结果一致;PFWD对试验路段填石路基回弹模量的测试结果及合埋设的电感式沉降计跟踪观测结果表明所提出的压实工艺优化方法科学、可靠,且实体工程压实效果较好。

Abstract: Based on the theory of elastoplastic mechanics and the basic principles of vibration compaction, using finite element software, numerical simulations of 16 filling-stone subgrade vibration compaction conditions with four parameters i. e., vibrating wheel weight, excitation force, vibration frequency and driving speed at two control levels, were carried out. The numerical simulation results and sequencing of the maximum compressive stress, effective compaction depth, and road surface settlement under various compaction conditions were considered, and then the optimum combination of compaction conditions was determined. PFWD was used to test and analyze the elastic modulus of filling-stone subgrade in the test section, and combined with the buried inductive settlement gauge to track the observation results. The test road rolling construction was carried out under the optimum combination of compaction condition. The results show that the optimum combination of compaction conditions is as follows :two types of rollers with vibrating wheel mass of 11 t and 13 t, the preferably excitation force of 400 kN, the vibration frequency of 28 Hz, and the driving speed of 4 km/h. The test results of porosity and settlement difference meet the specification requirements, and the compaction effect is consistent with numerical simulation results. The elastic modulus of the filling-stone subgrade in the test section and the buried inductive settlement confirm that the proposed compaction process optimization method is scientific and reliable, and the compaction effect of physical engineering is good.

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