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基于行驶平顺性的公路软基过渡段均衡沉降控制研究
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摘要
公路软土地基路段差异沉降是引起软基过渡段路面开裂、错台等病害的主要原因,路面变形破坏后降低了车辆行驶的平顺性,直接影响驾乘人员的舒适性和运输货物的完整性,严重时甚至引起行车事故,对公路工程的使用性能造成不良影响。因此,制定公路软基过渡段均衡沉降控制标准及优化控制方法对于解决公路软基过渡段沉降控制问题具有重要意义。
     本文在目前国内外相关研究成果的基础上,对公路软基过渡段均衡沉降控制标准及控制技术优化进行了系统深入研究。针对不同工况确定了公路软基过渡段沉降变形典型模式,建立了路面变形空间响应函数关系式,为车辆路面耦合系统中路面平顺性激励模型的建立奠定了基础。
     选择两自由度1/4车辆模型及随机激励与离散型激励相结合的路面模型建立车辆路面耦合系统,确定了模型系统的求解方法,基于MATLAB/SIMULINK环境编制了车辆路面耦合系统模型计算程序。
     提出了以车辆垂向振动加速度为指标的平顺性评价标准,研究了车辆平顺性与路面变形模式及变形量之间的函数关系式,提出了不同沉降模式、不同车速条件下基于车辆行驶平顺性的沉降控制标准。
     以水泥搅拌桩处治公路软基为例,建立三维有限元数值仿真模型,对水泥搅拌桩处治公路软基沉降效果影响因素进行了系统分析,确定了影响沉降控制效果的关键因素,对不同水泥搅拌桩布置方案的沉降控制效果进行了对比分析。
     以邯大高速公路软基处治工程为依托,根据水泥搅拌桩加固公路软基沉降控制效果分析结果和基于行驶平顺性的软基过渡段沉降控制标准,对水泥搅拌桩处治公路软基技术进行优化,提出了基于行驶平顺性的过渡段合理段落划分及合理长度,确定了横断面均衡沉降控制方案和纵断面均衡沉降控制方案。
     制定了基于均衡沉降控制的软基处治试验路实施方案及沉降观测试验,对不同方案处治效果进行了对比分析,计算了不同方案的工程量与工程费用,为公路软基过渡段均衡沉降控制标准制定与沉降处治方案优化提供参考依据。
Differential settlement in transition section of highway soft foundation is the main cause of pavement cracking. Pavement deformation reduce the running smoothness of vehicles, directly affect the the comfort of occupants and cargo integrity, serious disease even cause the accident. Therefore, to formulate equilibrium settlement control standard and optimization control method is important solve the problem of highway soft subgrade transition section.
     On the basis of the related research, equilibrium settlement control standards and control technology optimization of soft ground transition section were studied in this paper. Settlement deformation typical pattern for different conditions were determined, space response function of pavement deformation were established for the pavement smoothness incentive model of highway vehicle coupling system.
     Pavement vehicle coupling system was established by vehicle model with two degrees of freedom and the pavement model with random excitation and discrete excitation, a method for solving the model was determined by simulation program of vehicle pavement system base on MATLAB/SIMULINK.
     Ride comfort evaluation criteria with indicator of vehicle vertical vibration acceleration as indicator was put forwardas, the function of deformation mode and vehicle ride comfort were studied to propose settlement control standards with different settlement mode, different speed based on the vehicle ride comfort.
     Take the cement mixing pile treatment of soft ground for example, a three-dimensional finite element numerical simulation model was established to analyze factors of settlement in cement mixing pile Treatment of highway soft ground, the key factors affecting the settlement control effect were determined.
     Take the soft ground treatment project of HanDa Expressway for example, the cement mixing pile treatment of soft ground were optimized according to the analysis results of settlement control effect for cement mixing piles on soft ground, reasonable paragraph division and length of transition section were proposed to determine the equilibrium settlement control programs of cross-section and longitudinal section.
     The test road program and settlement observation test of soft ground treatment were implement to compare the effect of different programs. The amount and costs of engineering with different options were calculated to provide a reference for formulating the settlement control standards and treatment program in the transition section of soft ground.
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