本文選題：路基工程 + 路基填料　； 參考：《交通運輸工程學報》2014年03期

【摘要】：選取了4種代表性風化巖,分析了其級配組成、擊實參數(shù)與破碎特性,研究了風化巖路基長期穩(wěn)定性的影響因素。開發(fā)了能夠模擬路基填料自然風化的水溫循環(huán)試驗方法,研究了風化程度對風化巖填料加州承載比和水溫敏感性的影響與水溫循環(huán)效應(yīng)對風化巖性質(zhì)的影響。采用物理風化與化學風化相結(jié)合的評價方法,提出以風化特征指數(shù)作為風化程度的評價指標,分析了風化特征指數(shù)與各項路用性能的相關(guān)性,并建立了基于各項路用性能的風化程度分級標準。分析結(jié)果表明:隨著風化程度的加大,風化巖力學性能與水溫敏感性降低;應(yīng)用水溫循環(huán)模擬試驗?zāi)軌蚺袆e風化巖的長期路用性能;風化特征指數(shù)與風化巖路用性能決定系數(shù)大于0.85,相關(guān)性良好,可用來判定風化巖的風化程度與路用性能;選用風化特征指數(shù)為0.78的風化巖鋪筑試驗路,經(jīng)18個月觀測的路基最大沉降為7.8cm,路用性能良好。
[Abstract]:Four typical weathered rocks are selected, their gradation composition, compaction parameters and fracture characteristics are analyzed, and the factors influencing the long-term stability of weathered rock subgrade are studied. A water temperature cycling test method is developed to simulate natural weathering of embankment fillers. The effects of weathering degree on the bearing ratio and water temperature sensitivity of weathered rock fillers in California and the effects of water temperature cycling effects on the properties of weathered rocks are studied. With the combination of physical weathering and chemical weathering, the weathering characteristic index is put forward as the evaluation index of weathering degree, and the correlation between weathering characteristic index and road performance is analyzed. The classification standard of weathering degree based on each road performance is established. The results show that the mechanical properties and water temperature sensitivity of weathered rocks decrease with the increase of weathering degree, and the long-term road performance of weathered rocks can be judged by water temperature cycle simulation test. The weathering characteristic index and the determining coefficient of road performance of weathered rock are greater than 0.85, and the correlation is good, which can be used to judge the weathering degree and road performance of weathered rock, and the weathering characteristic index of 0.78 is used to construct the test road of weathering rock. The maximum settlement of the roadbed observed for 18 months is 7.8 cm, and the road performance is good.
【作者單位】： 長安大學特殊地區(qū)公路工程教育部重點實驗室;
【基金】：國家自然科學基金項目(51278059)
【分類號】：U416.1

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