循环荷载作用下土工合成材料加筋土动力参数研究  

Dynamic parameters research of geosynthetic reinforced soil under cyclic loading

作　　者：卢涛[1] 时伟[1] 张龙龙[1] 潘越[1] 

机构地区：[1]青岛理工大学土木工程学院,青岛266033

出　　处：《青岛理工大学学报》2016年第2期13-18,共6页Journal of Qingdao University of Technology

基　　金：国家自然科学基金资助项目(51078195);青岛市基础研究计划项目(12-1-4-4(4)-JCH)

摘　　要：土工合成材料加筋土技术已广泛应用于高速公路路基结构加固,可有效地提高路基承载能力和抗变形能力,改善公路结构长期性能,延长服役周期,保证车辆行驶的安全性与舒适性.由于高速公路交通荷载的特点是交通量大、车辆载重高、行驶速度快,目前以拟静力法进行交通荷载作用下的加筋土路基工程设计方法不够完善,加筋土动力特性及设计理论和参数研究远远落后于加筋土技术的应用和发展.采用室内动三轴试验方法,对不同土质(粉土、黏土)在不同围压(50,100和150kPa)、不同加筋层数(0,1和2层)情况下进行试验,研究加筋土动弹性模量及阻尼比的变化规律及其影响因素,为完善交通荷载作用下加筋土路基工程动力法设计理论和参数取值提供依据.The technology of geosynthetic reinforced soil has been widely used in the structural strengthening of highway subgrade,as promotes the bearing and deformation resistance capacity of the subgrade effectively,improves the long-term stability of the highway structure and prolongs the service period of the road to ensure the safety and comfort of the vehicle.The characteristics of the high way traffic load are the big volume of traffic,heavy traffic load,and fast speed.So far,the quasi-static method to design the geosynthetic reinforced subgrade under the action of traffic load is not perfect.The research on dynamic property,design theory and parameters lags far behind the application and improvement of the geosynthetic reinforced soil technology.This paper using the dynamic triaxial test in laboratory in different kinds of soil（clay and silt）,confining pressures（50,100 and 150kPa）,reinforcement layers（0layer,1layer and 2layers）researches the change rule and influence factors of dynamic modulus of elasticity and damping ratio to provide the gist for the improvement of dynamic design theory and parameter choice of geosynthetic reinforced subgrade with the effect of traffic load.

关 键 词：动三轴试验 加筋土 动弹性模量 阻尼比 

分 类 号：TU411.8[建筑科学—岩土工程]