岩土力学
巖土力學
암토역학
ROCK AND SOIL MECHANICS
2013年
11期
3141-3144
,共4页
压实方式%路基%湿度场%演变规律%相似模拟试验
壓實方式%路基%濕度場%縯變規律%相似模擬試驗
압실방식%로기%습도장%연변규률%상사모의시험
compaction method%subgrade%humidity field%evolution rule%similar simulation test
探究路基湿度场演变规律是解决路基工程水损害的基础问题之一，为研究路基湿度场受压实方式影响所产生的变化与分布问题，在相似准则推导的基础上构建了4种具备不同压实方式的室内路基相似物理试验模型。通过分析二维入渗方式的降雨试验结果，总结了不同压实方式影响下路床湿度场扰动区扩距、前扰动区湿度分布、湿度梯度和路堤湿度值变化的主要规律，并阐述其作用机制以及提出了相关工程建议。研究结果表明：路床湿度扰动区扩距随着路床压实度的增加呈线性递减；整个湿度扰动区可划分为前、后两个区域，前扰动区湿度分布基本呈线性速降状态，湿度梯度值随着路床压实度的增加呈线性提高；路床压实度对其下的路堤湿度影响效果显著，综合效应表现为路堤湿度随路床压实度增加呈线性递减；工程中严格控制上部路基压实效果对防止下部路基水毁病害有显著作用。
探究路基濕度場縯變規律是解決路基工程水損害的基礎問題之一，為研究路基濕度場受壓實方式影響所產生的變化與分佈問題，在相似準則推導的基礎上構建瞭4種具備不同壓實方式的室內路基相似物理試驗模型。通過分析二維入滲方式的降雨試驗結果，總結瞭不同壓實方式影響下路床濕度場擾動區擴距、前擾動區濕度分佈、濕度梯度和路隄濕度值變化的主要規律，併闡述其作用機製以及提齣瞭相關工程建議。研究結果錶明：路床濕度擾動區擴距隨著路床壓實度的增加呈線性遞減；整箇濕度擾動區可劃分為前、後兩箇區域，前擾動區濕度分佈基本呈線性速降狀態，濕度梯度值隨著路床壓實度的增加呈線性提高；路床壓實度對其下的路隄濕度影響效果顯著，綜閤效應錶現為路隄濕度隨路床壓實度增加呈線性遞減；工程中嚴格控製上部路基壓實效果對防止下部路基水燬病害有顯著作用。
탐구로기습도장연변규률시해결로기공정수손해적기출문제지일，위연구로기습도장수압실방식영향소산생적변화여분포문제，재상사준칙추도적기출상구건료4충구비불동압실방식적실내로기상사물리시험모형。통과분석이유입삼방식적강우시험결과，총결료불동압실방식영향하로상습도장우동구확거、전우동구습도분포、습도제도화로제습도치변화적주요규률，병천술기작용궤제이급제출료상관공정건의。연구결과표명：로상습도우동구확거수착로상압실도적증가정선성체감；정개습도우동구가화분위전、후량개구역，전우동구습도분포기본정선성속강상태，습도제도치수착로상압실도적증가정선성제고；로상압실도대기하적로제습도영향효과현저，종합효응표현위로제습도수로상압실도증가정선성체감；공정중엄격공제상부로기압실효과대방지하부로기수훼병해유현저작용。
As one of the basic issues, the evolutions of humidity field must be studied to avoid roadbed water damage. To study changes and distributions of the subgrade humidity field affected by compaction methods, 4 kinds of scale-down laboratory subgrade physical models with different compaction methods were tested. Through analyzing tow-dimensional infiltration rainfall test results, the influences of different compaction methods on the extended distances in roadbed humidity disturbed zone, humidity distributions in front disturbed zone, humidity gradients and humidity values of embankment were summarized. Their mechanisms were explained and relevant engineering suggestions were proposed. The results show that extended distances in roadbed humidity disturbed zone decrease linearly with the increase of compaction degree. The whole humidity disturbed zone can be divided into front and back zones. The front zone humidity shows a quick linear decrease distribution and humidity gradient increases linearly with the increase of roadbed compaction degree. Embankment humidity is affected significantly by the compaction degree of its upper roadbed. The combined effect reveals that embankment humidity decreases linearly with the increase of roadbed compaction degree. It should place a strict control on the upper subgrade impaction to avoid deeper subgrade damages due to water in engineering construction.
