沿海公路加筋地基动力特性试验研究

Experimental study on dynamic characteristics of reinforced foundation of coastal highway

作用在公路上的交通荷载是一种特殊的循环荷载,其大小随时间而变化.沿海公路软土地基的工程性质差,应用土工合成材料加筋技术进行公路地基处理是一种行之有效的方法.以青岛沿海公路淤泥质软土地基为研究对象,以循环荷载作用下软土的动弹性模量和动阻尼比为研究内容,对加筋软土地基的动力特性进行试验研究.采用动三轴试验方法,设置淤泥质软土不加筋、加1层筋和加2层筋3种试样类型,分别在不同围压(50、100、150kPa)条件下进行动三轴试验,研究动应变水平、固结围压和加筋条件对软土动弹性模量和动阻尼比的影响.

The traffic load on the highway is a kind of special cyclic load？ which varies with time. The engineering property of soft soil foundation of the coastal highway is poor, but it is found to be an effective method to deal with the road foundation by using the reinforced technology of the geosynthetics. This paper takes the silt soft soil foundation of Qingdao coastal highway as the research object, studies the dynamic characteristics of reinforced soft soil foundation by using the elastic modulus and damping ratio of soft soil under cyclic loads as the research content. It uses the dnamic triaxial test methods and sets three types of test specimens, respectively, purifies silt soft soil with a layer or two of reinforcement, and car-ries out the test under three different confining pressures （50,100,150 kPa）. Through this test, it studies the effects of dynamic strain level？ confines pressure and reinforcement condi-tion on dynamic elastic modulus and dynamic damping ratio of soft soil.