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[目的]研究黄土沟壑地区高填方工程在填方完成后填筑体内部的变形状态,为后续相关研究提供基础依据。[方法]在某原始沟壑地形在进行高填方工程后,在填方场地内布设3组深层监测井,对填筑体内部土体的分层沉降、土压力以及体积含水率进行了持续12个月的监测。[结果]工后12个月时间里,沟壑高填方内部的主要变形量集中在填筑体与原始地基交接的位置,沟壑中心地下18—27m以及原始陡坡部位土层出现明显的张拉变形。在原始沟壑地形的影响下,填筑体内部表现出明显的土拱效应。地下18m以下不同部位土压力差异明显,中心部位土压力较小,不利于中央部位填土的自重压密。[结论]在黄土沟壑地形中进行高填方工程后,填筑体内部出现了对地下水上升表现敏感的区域,当地下水位上升时局部的湿化变形可能产生工程土洞、地面塌陷。
[Objective] The research aimed to study the deformation status of the high-fill project in the loess gully area after the filling was completed, providing the basis for subsequent related research. [Method] After a high-fill project was carried out on a primitive gully terrain, three sets of deep monitoring wells were laid in the fill site and the stratification and subsidence, earth pressure and volumetric moisture content of the soil inside the structure were sustained for 12 Month of monitoring. [Result] During the 12 months after the work, the main deformation inside the high gully filling was concentrated in the place where the filling body was connected with the original foundation. The 18-27m under the center of the gully and the obvious deformation of the soil in the original steep slope area . Under the influence of the original gully terrain, the interior of the filling body shows obvious soil arching effect. The difference of earth pressure in different parts under 18m underground is obvious, and the earth pressure in the central part is small, which is unfavorable to the self-compaction of filling in the central part. [Conclusion] After the high-fill project in loess gully topography, there appeared the region sensitive to the rising of groundwater in the filling body. Local humidification deformation may lead to engineering soil cave and ground collapse when the local water table rises.