二灰土改良风积土可行性试验研究  

Experimental Study on Feasibility of Lime-Ash Improved Aeolian Soil

作　　者：薛晓辉[1] 扈世民[2] 

机构地区：[1]陕西铁路工程职业技术学院建筑工程系,陕西渭南714099 [2]北京交通大学土木与建筑工程学院,北京100044

出　　处：《铁道标准设计》2013年第12期63-66,共4页Railway Standard Design

基　　金：国家自然科学基金(51274079)

摘　　要：采用室内实验等手段对二灰土改良风积土力学参数进行对比,研究二灰土改良风积土的可行性。可得结论:(1)二灰改良土强度的形成即为水化反应过程,整个过程历时较长,在此过程中二灰土改良土强度单调递增;(2)单纯依靠增大击实功提高风积土抗剪强度较为困难,通过一定配比进行二灰土改良可有效改善风积土的粒径级配;(3)二灰改良土的密实度对黏聚力的影响较大,改良土的抗剪强度随之增大;(4)选取密实度96%,孔隙率11.4%作为二灰土改良土路基的压实标准;(5)灰土比、密实度、含水率与围压为影响二灰改良土抗剪强度特性主要因素,其中灰土比影响最为显著。The mechanical parameters of lime-ash improved aeolian soil were contrastively analyzed by means of laboratory experiment in this thesis, so as to study the feasibility of using the lime-ash improved aeolian soil. And then the conclusions were drawn as follows. （ 1 ） The process of strength forming of lime-ash improved soil is a process of hydration reaction, and the whole process will last longer with monotonic increasing of the strength of lime-ash improved soil. （2） It is relatively difficult to increase the shear strength of aeolian soil by merely increasing the compaction work, while the particle-size gradation of the aeolian soil can effectively be improved by the use of lime-ash improved aeolian soil via a certain mixing proportion. （3） The compactness degree of the lime-ash improved soil has greater effect on the cohesion force, and the shear strength of the lime-ash improved soil will increase with the increase of the compactness degree. （4） It is suggested that the 96% compactness degree with the 11.4% porosity ratio can serve as the compaction standard of the railway subgrade with lime-ash improved soil. （5）The lime-ash-soil ratio, compactness degree, moisture content and the confining pressure are the important factors affecting the shear strength characteristics, among which the lime-ash-soil ratio is the most important one.

关 键 词：路基填料 二灰土 风积土 力学特性 灰土比 击实试验 三轴试验 

分 类 号：U416.1[交通运输工程—道路与铁道工程]