铁道标准设计
鐵道標準設計
철도표준설계
RAILWAY STANDARD DESIGN
2013年
12期
63-66
,共4页
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
路基填料%二灰土%風積土%力學特性%灰土比%擊實試驗%三軸試驗
로기전료%이회토%풍적토%역학특성%회토비%격실시험%삼축시험
subgrade filler%lime-ash soil%aeolian soil%mechanical characteristics%lime-ash-soil ratio%compaction test%triaxial test
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。
採用室內實驗等手段對二灰土改良風積土力學參數進行對比，研究二灰土改良風積土的可行性。可得結論：(1)二灰改良土彊度的形成即為水化反應過程，整箇過程歷時較長，在此過程中二灰土改良土彊度單調遞增；(2)單純依靠增大擊實功提高風積土抗剪彊度較為睏難，通過一定配比進行二灰土改良可有效改善風積土的粒徑級配；(3)二灰改良土的密實度對黏聚力的影響較大，改良土的抗剪彊度隨之增大；(4)選取密實度96%，孔隙率11．4%作為二灰土改良土路基的壓實標準；(5)灰土比、密實度、含水率與圍壓為影響二灰改良土抗剪彊度特性主要因素，其中灰土比影響最為顯著。
채용실내실험등수단대이회토개량풍적토역학삼수진행대비，연구이회토개량풍적토적가행성。가득결론：(1)이회개량토강도적형성즉위수화반응과정，정개과정력시교장，재차과정중이회토개량토강도단조체증；(2)단순의고증대격실공제고풍적토항전강도교위곤난，통과일정배비진행이회토개량가유효개선풍적토적립경급배；(3)이회개량토적밀실도대점취력적영향교대，개량토적항전강도수지증대；(4)선취밀실도96%，공극솔11．4%작위이회토개량토로기적압실표준；(5)회토비、밀실도、함수솔여위압위영향이회개량토항전강도특성주요인소，기중회토비영향최위현저。
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.
