高速铁路技术
高速鐵路技術
고속철로기술
HIGH SPEED RAILWAY TECHNOLOGY
2013年
6期
33-36
,共4页
膨胀土%改良%膨胀性%崩解性
膨脹土%改良%膨脹性%崩解性
팽창토%개량%팽창성%붕해성
expansive soil%improvement%expansibility%disintegration
由于高速铁路路基变形控制严格，路基填料改良已成为高速铁路必须解决的问题，已受到岩土科学工作者和工程师的普遍关注。膨胀土是具有显著湿胀干缩性的地质体，其黏粒成分主要为强亲水性矿物，因此，膨胀土的改良是膨胀土工程地基处理研究领域中的重要课题之一。结合某铁路路基工程，对具有膨胀性和崩解性的地基土进行室内试验，得到以下研究结论：（1）随掺水泥量增大，土样击实后的最大干密度减小，而最优含水率增大；（2）随掺砾碎石量增大，土样击实后的最大干密度增大，而最优含水率减小，且变化幅度增加较快；（3）掺加水泥4％、5％、6％后，其自由膨胀率分别变成39％、34％、28％，其自由膨胀率随水泥掺加量增多而减少，且完全不见崩解现象，说明掺加水泥对改善崩解性效果较好，基本能满足高速铁路路基和路堤的要求。
由于高速鐵路路基變形控製嚴格，路基填料改良已成為高速鐵路必鬚解決的問題，已受到巖土科學工作者和工程師的普遍關註。膨脹土是具有顯著濕脹榦縮性的地質體，其黏粒成分主要為彊親水性礦物，因此，膨脹土的改良是膨脹土工程地基處理研究領域中的重要課題之一。結閤某鐵路路基工程，對具有膨脹性和崩解性的地基土進行室內試驗，得到以下研究結論：（1）隨摻水泥量增大，土樣擊實後的最大榦密度減小，而最優含水率增大；（2）隨摻礫碎石量增大，土樣擊實後的最大榦密度增大，而最優含水率減小，且變化幅度增加較快；（3）摻加水泥4％、5％、6％後，其自由膨脹率分彆變成39％、34％、28％，其自由膨脹率隨水泥摻加量增多而減少，且完全不見崩解現象，說明摻加水泥對改善崩解性效果較好，基本能滿足高速鐵路路基和路隄的要求。
유우고속철로로기변형공제엄격，로기전료개량이성위고속철로필수해결적문제，이수도암토과학공작자화공정사적보편관주。팽창토시구유현저습창간축성적지질체，기점립성분주요위강친수성광물，인차，팽창토적개량시팽창토공정지기처리연구영역중적중요과제지일。결합모철로로기공정，대구유팽창성화붕해성적지기토진행실내시험，득도이하연구결론：（1）수참수니량증대，토양격실후적최대간밀도감소，이최우함수솔증대；（2）수참력쇄석량증대，토양격실후적최대간밀도증대，이최우함수솔감소，차변화폭도증가교쾌；（3）참가수니4％、5％、6％후，기자유팽창솔분별변성39％、34％、28％，기자유팽창솔수수니참가량증다이감소，차완전불견붕해현상，설명참가수니대개선붕해성효과교호，기본능만족고속철로로기화로제적요구。
Due to the strict control of the subgrade deformation of high-speed railway,the improvement of subgrade filling has become an important issue,which has been concerned by the geotechnical researchers and engineers.The expansive soil is a kind of geologic body with obvious shrinking and bulking features,and its clay content is mainly consisting of super-hydrophilic mineral,so the improvement of expansive soil is one of the significant issues in the study of expan-sive soil subgrade treatment.Combined with a case of railway subgrade engineering,indoor-test has been undertaken on the soil with expansibility and disintegration.The results are:(1 )With the increment of cement content,the maximum dry density of expansive soil decreases,while the optimum moisture content increases;(2)With the increment of grav-el,the maximum dry density of expansive soil increases and the optimum moisture content decreases,and the range of variation increases fast;(3 )With adding cement content to 4%,5%,6%,the free expansion rates are separately 39%、34%、28%.Free expansion rate of expansive soil decreases with the increment of cement content and there is no disintegration happened at all,which illustrates the increment of cement has good effect on improvement of disintegration that can basically meet the requirement of subgrade and embankment of high-speed railway.
