橡胶颗粒改良粉煤灰土的动力特性试验研究  

Experimental research on dynamic characteristics of fly ash soil improved by rubber particles

作　　者：李长雨[1,2] 刘寒冰[1] 魏海斌[1] 

机构地区：[1]吉林大学交通学院,长春130022 [2]长春工程学院土木工程学院,长春130012

出　　处：《岩土力学》2011年第7期2025-2028,2033,共5页Rock and Soil Mechanics

基　　金：863国家高科技研究发展计划项目(No.2007AA11Z114);吉林大学创新基金项目

摘　　要：对橡胶颗粒改良粉煤灰土的动强度、动模量、黏聚力和内摩擦角进行了动三轴试验研究,并将试验结果与粉煤灰土的动力特性加以对比,分析表明:粉煤灰土及橡胶颗粒改良粉煤灰土在同一围压下动强度均随破坏周数的增加而减小;在同一破坏周数下动强度随着围压的增加而增加;粉煤灰土的黏聚力为203.73 kPa,内摩擦角为11°;橡胶颗粒改良粉煤灰土的黏聚力为227.26 kPa,内摩擦角为17°,橡胶颗粒改良粉煤灰土的黏聚力增大了23.53 kPa,提高了11.55%;粉煤灰土的初始切线模量及平均动模量高于橡胶颗粒改良粉煤灰土的初始切线模量及平均动模量。研究表明,橡胶颗粒改良后的粉煤灰土具有动强度高、黏聚力和内摩擦角大的特点,从而说明橡胶颗粒改良后的粉煤灰土可以作为季冻区路基冷阻层材料。Dynamic triaxial tests are carried out to research the characteristics of fly ash soil improved by rubber particles such as the dynamic strength, dynamic modulus, cohesion and internal friction angle. Comparing with the normal fly ash soil, the experiment results demonstrate the conclusions as follows. Both of the dynamic strengths of the two soils are decreasing as the destruction cycles increasing under the same confining pressure. And the dynamic strengths of the two soils are increasing as the confining pressure increasing at the same destruction cycle. The cohesion is 203.73 kPa and the internal friction angle is 11 o of the fly ash soil, at the same time the cohesion is 227.26 kPa and the internal friction angle is 17~ of the improved soil. The cohesion increases 23.53 kPa, about 11.55%. The initial tangent modulus and the average dynamic modulus are higher than the data of the improved soil. The experimental result shows that the fly ash soil improved by rubber particles has high dynamic strength, cohesion and internal friction angle large. So that rubber particles of fly ash improved soil as subgrade freezing cold season blocking layer material.

关 键 词：橡胶颗粒 粉煤灰土 冷阻层 动强度 动模量 

分 类 号：U414.1[交通运输工程—道路与铁道工程]