摘要
依托某市政道路病害检测,通过现场勘察、钻探取芯、开挖探坑、室内试验等手段,发现该道路不均匀沉降变形及基层损坏严重,其根源在于地基及路基土具有弱膨胀性土特性。进一步通过膨胀性试验,分析了膨胀土在有荷、无荷条件下的膨胀率及膨胀力,提出了土体膨胀率、膨胀力与土体压实度、含水率的相关关系。为了揭示膨胀土对路面结构破损及不均匀变形的影响机理,运用BISAR软件计算分析了不同膨胀力、不同基层模量对道路结构层受力特性及变形特性的影响,揭示了膨胀土路基半刚性路面结构破损机理。
Relying on the disease detection of municipal road and through the field survey,drilling coring,excavation test pit and laboratory test,the uneven settlement,deformation and serious damaged base course of this road are found,which original causes are in the base and subgrade soil having the weak expansive soil properties.According to the further expansibility test,the article analyzes the expansive ratio and expansive force of expansive soil under load and no-load conditions,and puts forward the correlation between the expansion ratio,expansion force and compaction degree,moisture content of soil.In order to reveal the influence mechanism of expansive soil to the damage and uneven deformation of pavement structure,the article analyzes the influences of the different expansion forces and the different base moduluses on the mechanical characteristics and deformation properties of road structural layer,and reveals the failure mechanism of expansive soil subgrade semi-rigid pavement structure.
出处
《城市道桥与防洪》
2018年第4期33-36,43,共5页
Urban Roads Bridges & Flood Control
关键词
膨胀土路基
病害检测
室内试验
力学分析
expansive soil subgrade
disease detection
laboratory test
mechanical analysis
