摘要
为了探究大临铁路站场的高填方结构中土压力的变化规律,在高填方中布设了多排土压力盒,同时在高填方底部的涵洞左右肩处各布设了一排土压力盒,经过两年多监测,发现填土中竖向土压力随填土高度的增加而增加,随距填土体顶面距离的增加呈现先增加后减少的态势,总体符合梅耶霍夫准则,反映出土拱效应。沿填土体的横截面方向比较,发现在填土的初期阶段,竖向土压力沿横断面分布相对均匀,第一层土压力随着填土体高度的增加而增加,表现出左边大、右边小的变化规律,高填方竣工后,横断面上土压力数值还在调整变化,整个曲线在横向呈S状分布,与第一层土压力相比,第二层以及后续填土层的竖向土压力虽然也随填土体高度的增加而增加,但在横向则呈R状分布。涵洞左肩处土压力随填土高度的增加而增加,表现为左端的土压力最大,右端土压力最小,沿涵洞轴线方向呈波浪式衰减,填土竣工后,土压力稳定,呈多峰的马鞍型分布。涵洞右肩土处的压力分布稍有不同,在洞轴线中部土压力分布相对比较均匀。
In order to explore the variation law of soil pressure in the high fill structure of Dalin Railway Station,the authors set up multiple rows of soil pressure boxes in the high fill,and also set up a row of soil pressure boxes on the left and right shoulders of the culvert at the bottom of the high fill.After more than two years of monitoring,it was found that the vertical soil pressure in the fill increased with the height of the fill,and showed a trend of first increasing and then decreasing with the distance from the top surface of the fill.Overall,it conforms to the Meyerhoff criterion and reflects the soil arch effect.Comparing along the cross-sectional direction of the filling soil,it was found that in the initial stage of filling soil,the vertical soil pressure was relatively evenly distributed along the cross-section.The first layer of soil pressure increased with the height of the filling soil,showing a pattern of large on the left and small on the right.After the completion of the high fill,the soil pressure values on the cross-section were still adjusting and changing.The entire curve showed an S-shaped distribution in the horizontal direction.Compared with the first layer of soil pressure,the vertical soil pressure of the second and subsequent filling layers also increased with the height of the filling soil,but showed an R-shaped distribution in the horizontal direction.The soil pressure at the left shoulder of the culvert increases with the height of the backfill,with the highest soil pressure at the left end and the lowest at the right end.It decays in a wave like pattern along the axis of the culvert.After the completion of the backfill,the soil pressure stabilizes and exhibits a multi peak saddle shaped distribution.The distribution of soil pressure on the right shoulder of the culvert is slightly different,and the distribution of soil pressure in the middle of the tunnel axis is relatively uniform.
作者
吴浩
肖玉林
张春龙
邹华
秦舒桢
李国峰
雷胜友
Wu Hao;Xiao Yulin;Zhang Chunlong;Zou Hua;Qin Shuzhen;Li Guofeng;Lei Shengyou(China Railway Construction 24th Bureau Group Southwest Construction Co.,Ltd.,Chengdu Sichuan 610000,China;School of Highway,Chang’an University,Xi’an Shaanxi 710064,China)
出处
《山西建筑》
2026年第2期129-133,共5页
Shanxi Architecture
基金
国家自然科学基金项目:裂土的动力性状的弹塑性描述及其动力反应的计算机模拟(项目编号:59479017)
铁道部科技研究开发项目:低压缩性土及黄土地基深化研究(项目编号:2010G003-F)
地质灾害防治与地质环境保护国家重点实验室开放基金项目:固化液-纤维加筋法抑制膨胀土膨胀性研究(项目编号:GZ2005-03)
中铁二十四局科技研发项目:高填方边坡路堤沉降变形观测与计算分析研究(项目编号:220021170340)。
关键词
竖向土压力
土拱效应
横断面
填土体
涵洞肩部
vertical soil pressure
soil arching effect
cross section
filling soil
culvert shoulder
