铁道标准设计
鐵道標準設計
철도표준설계
RAILWAY STANDARD DESIGN
2014年
12期
6-8,9
,共4页
客运专线%寒冷地区%路基冻胀%现场试验
客運專線%寒冷地區%路基凍脹%現場試驗
객운전선%한랭지구%로기동창%현장시험
Passenger dedicated line%Cold region%Subgrade frost heaving%Field test
为掌握大西客运专线寒冷地区路基冻胀变形规律,选择4个代表性监测段落,在一个冻融期内对路基中地温、冻胀变形及含水量进行观测,测试结果表明：地温发展变化大致经历快速降温、慢速降温、升温3个阶段,部分段落的最大冻结深度测试值大于设计值；路基表层处体积含水量上下波动相对较大,路基深层处体积含水量有缓慢减小的趋势；路基冻胀变形均小于8mm,冻胀发生的部位主要集中在基床表层范围。
為掌握大西客運專線寒冷地區路基凍脹變形規律,選擇4箇代錶性鑑測段落,在一箇凍融期內對路基中地溫、凍脹變形及含水量進行觀測,測試結果錶明：地溫髮展變化大緻經歷快速降溫、慢速降溫、升溫3箇階段,部分段落的最大凍結深度測試值大于設計值；路基錶層處體積含水量上下波動相對較大,路基深層處體積含水量有緩慢減小的趨勢；路基凍脹變形均小于8mm,凍脹髮生的部位主要集中在基床錶層範圍。
위장악대서객운전선한랭지구로기동창변형규률,선택4개대표성감측단락,재일개동융기내대로기중지온、동창변형급함수량진행관측,측시결과표명：지온발전변화대치경력쾌속강온、만속강온、승온3개계단,부분단락적최대동결심도측시치대우설계치；로기표층처체적함수량상하파동상대교대,로기심층처체적함수량유완만감소적추세；로기동창변형균소우8mm,동창발생적부위주요집중재기상표층범위。
Four representative monitoring sections are selected in the freezing and thawing period to learn the rules of subgrade frost heaving deformation on Datong-Xi’an passenger dedicated line in cold region by means of the observation of ground temperature, subgrade frost heave deformation and water content. The results show that the development and change of ground temperature occur in three stages: rapid cooling, slow cooling and temperature rise; the measured maximum freezing depths are greater than the design values on some sections; the fluctuation of volumetric water content in the subgrade surface is relatively greater, while the volumetric water content in deep subgrade tends to reduce slowly; the subgrade frost heave deformation is less than 8 mm, and the frost heaving concentrates in the subgrade surface.
