动力荷载作用下河道淤泥气泡混合土的变形特性试验  被引量:4

Test on deformation characteristics of foamed mixture lightweight soil using river sludge under dynamic load

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作  者:刘增祥[1] 顾欢达[1] 陈冬青 

机构地区:[1]苏州科技大学土木工程学院,江苏苏州215011 [2]苏州市恒正工程质量检测有限公司,江苏苏州215134

出  处:《水利水电科技进展》2016年第4期47-52,共6页Advances in Science and Technology of Water Resources

基  金:国家自然科学基金(51378327)

摘  要:为了解河道淤泥气泡混合土(FMLSS)在动力荷载作用下的变形特性,采用室内动三轴试验研究了围压、含水率、水泥掺入量和气泡含量对FMLSS动变形特性的影响。试验结果表明:FMLSS的动应力应变关系曲线符合双曲线关系,在一定的动应力作用下,动应变随围压和水泥掺入量的增大而减小,随含水率和气泡含量的增大而增大;当动应变相同时,FMLSS的动弹性模量随围压和水泥掺入量的增大而增大,随含水率和气泡含量的增大而减小,动弹性模量与动应变的关系曲线为平缓衰减型;含水率和水泥掺入量是影响FMLSS变形特性的主要因素。In order to obtain the deformation characteristics a foamed mixture lightweight soil using river sludge ( FMLSS) under a dynamic load, the effects of the confining pressure, water content, cement content, and air foam content on the dynamic deformation characteristics of the FMLSS were investigated using laboratory dynamic triaxial tests. Test results show that the fitting dynamic stress-strain curve of the FMLSS is of the hyperbolic type. The dynamic strain of the FMLSS decreases with the increase of confining pressure and cement content, and increases with the increase of water content and air foam content under a certain dynamic stress lerel. Under a constant dynamic strain, the dynamic elastic modulus of the FMLSS increases with the increase of confining pressure and cement content, and decreases with the increase of water content and air foam content. The relationship curve of the dynamic elastic modulus and dynamic strain shows a gradually decreasing trend. The water content and air foam content are the main factors influencing the dynamic deformation characteristics of a FMLSS.

关 键 词:河道淤泥气泡混合土 动力荷载 变形特性 动应力应变关系 动弹性模量 

分 类 号:TV85[水利工程—水利水电工程] TU447[建筑科学—岩土工程]

 

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