本文選題：路基工程 + 低矮路堤�。� 參考：《巖石力學與工程學報》2014年08期

【摘要】：為研究低矮路堤下中 強膨脹土地基浸水飽和后的變形特性,依托云桂高速鐵路建設(shè),通過人工浸水方式開展不同高度等尺寸路基現(xiàn)場浸水試驗。試驗采用砂孔、砂槽及砂墊層等方式多面浸水,并同步觀測路基填土期、穩(wěn)載期及人工浸水期地基表面與路基表面的變形。研究結(jié)果表明:從路基填筑開始到人工浸水結(jié)束,膨脹土地基的變形曲線呈"S"型分布。沿路基橫斷面方向,地基表面的膨脹變量呈"鍋底"型分布,路基表面的膨脹變量呈"V"型分布,地基表面的相對膨脹量隨路基填高的增加而呈線性遞減。通過對比不同路基填高的相對膨脹量表明,地基表面的相對膨脹量均大于路基表面的相對膨脹量,地基表面的膨脹變形沿路基本體呈衰減變化。在試驗成果的基礎(chǔ)上,初步提出以路基表面膨脹變形為0作為控制標準確定路基臨界填高的設(shè)計思路�，F(xiàn)場試驗的設(shè)計原則與實施方法也可為今后研究鐵路路基下膨脹土地基脹縮特性提供參考。
[Abstract]:In order to study the deformation characteristics of saturated medium and strong expansive soil foundation under low embankment, based on Yun-Gui high-speed railway construction, the in-situ soaking test of subgrade with different height and equal size was carried out by artificial soaking method. Sand holes, sand grooves and sand cushion were used in the experiment. The deformation of subgrade surface and subgrade surface was observed simultaneously during filling period, steady loading period and artificial flooding period. The results show that from the beginning of subgrade filling to the end of artificial flooding, the deformation curve of expansive soil foundation is "S" type distribution. Along the cross-section of the road foundation, the expansion variables on the surface of the foundation are "pot bottom" and those on the surface of the subgrade are "V". The relative expansion of the surface of the foundation decreases linearly with the increase of the filling height of the subgrade. By comparing the relative expansion of different subgrade filling heights, it is shown that the relative expansion of the subgrade surface is larger than that of the subgrade surface, and the swelling deformation of the foundation surface is attenuated along the road basic body. Based on the experimental results, the design idea of determining the critical filling height of the subgrade with the expansion deformation of the embankment surface as the control standard is put forward preliminarily. The design principle and implementation method of field test can also provide a reference for the study of expansion and shrinkage characteristics of expansive soil foundation under railway subgrade in the future.
【作者單位】： 西南交通大學土木工程學院;西南交通大學道路工程四川省重點實驗室;中鐵二院工程集團有限責任公司;
【基金】：鐵道部科技研究開發(fā)計劃項目(2010G003 F)
【分類號】：U416.167

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