河海大学学报（自然科学版）
河海大學學報（自然科學版）
하해대학학보（자연과학판）
JOURNAL OF HOHAI UNIVERSITY (NATURAL SCIENCES)
2014年
3期
250-256
,共7页
道路工程%暂态饱和区%降雨入渗%粗粒土路堤%数值模拟
道路工程%暫態飽和區%降雨入滲%粗粒土路隄%數值模擬
도로공정%잠태포화구%강우입삼%조립토로제%수치모의
road engineering%transient saturated areas%rainfall infiltration%coarse-grained soil embankment%numerical simulation
为探讨降雨入渗条件下粗粒土路堤边坡暂态饱和区的形成条件，分析降雨入渗参数对暂态饱和区发展规律的影响，基于室内外试验数据与实际气象数据，拟定不同的数值计算方案，采用降雨入渗理论对降雨入渗参数影响下粗粒土路堤边坡雨水入渗过程进行数值模拟。结果表明：降雨强度q与饱和渗透系数ksat的比值是决定路堤内雨水入渗方式及暂态饱和区形成的关键因素，当q/ksat≥1.5时，路堤边坡表面及坡脚水平面将形成一定深度的暂态饱和区，暂态饱和区的形成增大了路堤发生失稳的可能；降雨入渗仅会引起路堤边坡坡面以下水位大幅度上升，对路面中部以下地下水位影响有限；路堤边坡暂态饱和区的扩展速度主要取决于q与ksat的大小，而暂态饱和区形成的时间与扩展面积则受到降雨强度、降雨历时与饱和含水率的共同影响。
為探討降雨入滲條件下粗粒土路隄邊坡暫態飽和區的形成條件，分析降雨入滲參數對暫態飽和區髮展規律的影響，基于室內外試驗數據與實際氣象數據，擬定不同的數值計算方案，採用降雨入滲理論對降雨入滲參數影響下粗粒土路隄邊坡雨水入滲過程進行數值模擬。結果錶明：降雨彊度q與飽和滲透繫數ksat的比值是決定路隄內雨水入滲方式及暫態飽和區形成的關鍵因素，噹q/ksat≥1.5時，路隄邊坡錶麵及坡腳水平麵將形成一定深度的暫態飽和區，暫態飽和區的形成增大瞭路隄髮生失穩的可能；降雨入滲僅會引起路隄邊坡坡麵以下水位大幅度上升，對路麵中部以下地下水位影響有限；路隄邊坡暫態飽和區的擴展速度主要取決于q與ksat的大小，而暫態飽和區形成的時間與擴展麵積則受到降雨彊度、降雨歷時與飽和含水率的共同影響。
위탐토강우입삼조건하조립토로제변파잠태포화구적형성조건，분석강우입삼삼수대잠태포화구발전규률적영향，기우실내외시험수거여실제기상수거，의정불동적수치계산방안，채용강우입삼이론대강우입삼삼수영향하조립토로제변파우수입삼과정진행수치모의。결과표명：강우강도q여포화삼투계수ksat적비치시결정로제내우수입삼방식급잠태포화구형성적관건인소，당q/ksat≥1.5시，로제변파표면급파각수평면장형성일정심도적잠태포화구，잠태포화구적형성증대료로제발생실은적가능；강우입삼부회인기로제변파파면이하수위대폭도상승，대로면중부이하지하수위영향유한；로제변파잠태포화구적확전속도주요취결우q여ksat적대소，이잠태포화구형성적시간여확전면적칙수도강우강도、강우력시여포화함수솔적공동영향。
In order to explore the formation conditions of transient saturated areas of a coarse-grained soil embankment slope with rainfall infiltration, and to investigate the effects of rainfall infiltration parameters on the development of the transient saturated areas, we designed various numerical calculation schemes using field and laboratory data and actual meteorological data, and conducted numerical simulation of the rainfall infiltration process of the coarse-grained soil embankment slope under the influence of rainfall infiltration parameters based on the theory of rainfall infiltration. The results show that the rainfall infiltration direction and formation of transient saturated areas were determined by the ratio of rainfall intensity (q) to saturated permeability coefficient (ksat). When q/ksat≥1. 5, transient saturated areas with a certain depth formed at the embankment slope surface and slope toe. The formation of the transient saturated areas increased the possibility of embankment failure. The rainfall infiltration only caused the water level under the embankment slope surface to increase significantly, but had limited influence on the groundwater level below the central road. The expanding speed of the transient saturated areas was mainly determined by q and ksat, while the formation time and expansion area of the transient saturated areas were influenced by q, rainfall duration, and saturated water content.
