加筋高填石路堤填筑过程动态稳定性分析与监测  

DYNAMIC STABILITY ANALYSIS AND SITE MONITORING OF REINFORCED HIGH ROCKFILL EMBANKMENT DURING CONSTRUCTION

作　　者：杨成忠[1,2] 刘新荣[1] 王淑芳[2] 方涛[1,2] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]华东交通大学土木建筑学院,江西南昌330013

出　　处：《岩石力学与工程学报》2010年第A01期3321-3328,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：华东交通大学博士启动基金(01308015);江西省教育厅科自然科学基金(GJJ09218);国家自然科学基金创新群体基金(50621403)

摘　　要：为揭示陡坡上高约72m的高填石路堤填筑过程中的动态稳定性,为施工质量控制提供参考,通过对斜坡上高路堤破坏模式和施工中地基处理措施分析,确定高路堤在填筑过程中的潜在滑动面为圆弧滑动面形状。在分析筋-土相互作用和借鉴前人三轴试验结果的基础上,阐述土工格栅提高路堤稳定性的机制。基于极限平衡理论中瑞典圆弧法,将高路堤填筑过程分为72步,研究不同填筑层位路堤潜在滑动面的特征,搜索出最危险滑动面的位置,计算相应的最小安全系数。结果表明:随着路堤填筑高度的增加,最危险滑动面表现为向路堤堤身和路堤坡脚移动的趋势;最小安全系数随路堤填筑高度和地表坡度增大逐渐减小,最小安全系数发生在路堤填筑完成的层位,路堤整体稳定性要求满足规范要求;受陡坡地形变化影响,在32～48m范围内,路堤最小安全系数的变化最大。因此,施工填筑过程中应注意填筑高度和地形变化对路堤安全系数的影响,并结合监测结果采取相应的稳定性控制措施。To reveal the dynamic stability of high rockfill embankment with 72 m height on steep slope and provide reference for its quality control, By analyzing the rupture modulus of high embankment on steep slope and treatment measures for foundation, potential slipping circular arc of high rockfill embankment during construction is proposed. By analyzing the interaction between soil and reinforcement and references about previous triaxial test result, the mechanism that Geogrid improves the stability of embankment is expounded. Based on Sweden arc method of limit equilibrium theory, considering the filling process as 72 steps, the character of potential slipping circular arc at different layers are analyzed; the most dangerous sliding surface position is searched out and the corresponding minimal safety factors are calculated. The results show that： With the increase of embankment＇s filled height, the potential slipping circulars moved to embankment body and its bottom. With the increasing of embankment＇s filled height and the surface slope, the minimal safety factors gradually decreased and the minimal safety factors occurred in the top layer; the overall stability meets the requirement of the specifications. Influenced by steep slope terrain, the safety factor changes obviously during the height between 32 - 48 m. Therefore, in the process of filling, the filling height and the changes in terrain should be paid more attention to, and corresponding measures should be taken to control the stability by the monitoring results.

关 键 词：岩石力学 高填石路堤 稳定性 瑞典圆弧法 滑动面 安全系数 

分 类 号：TU45[建筑科学—岩土工程]