路堑边坡开挖变形监测试验与坡体稳定评估分析  

Study on Deformation Monitoring Test of Cutting Slope and Its Stability Evaluation

作　　者：程建军[1] 柳墩利[2] 廖小平[2,3] 蒋富强 杨印海 

机构地区：[1]石河子大学水利建筑工程学院,新疆石河子832003 [2]中国铁道科学研究院,北京100081 [3]中铁西北科学研究院有限公司,甘肃兰州730000

出　　处：《铁道学报》2011年第5期85-90,共6页Journal of the China Railway Society

基　　金：国家自然科学基金资助项目(50908152);石河子大学科学技术研究发展计划项目(RCZX200822)

摘　　要：为研究坡体处于稳定状态以及坡体由稳定状态向不稳定状态发展时影射到位移监测曲线的形态特征与演化规律,依托某在建高边坡开展路堑边坡开挖变形监测现场试验。综合分析测试验成果、开挖过程坡体宏观表征以及数值分析结果,得到以下结论:当坡体位移监测曲线呈顶部回缩,深部鼓胀的"D"型时,影射坡体稳定度处于较高状态,此时边坡变形位移主要体现开挖卸荷的差异回弹效应(开挖体水平底面垂直向上的卸荷回弹占主导地位);当位移监测曲线浅部正值位移逐渐增大,且深部位移保持不变时,影射坡体在开挖卸荷作用下,差异回弹效应消减,松弛变形逐渐加强,坡体逐渐趋于不稳定状态。试验结论与边坡实际施工开挖过程宏观表征一致,并与有限元数值分析总体规律一致。可为铁路及高速公路路堑边坡坡体施工开挖过程以及长期运营的稳定性监测提供参考。In order to study the morphologic characteristics and evolution law of displacement monitoring curves corresponding to the states when the cutting slope remained stable and it was becoming from stable to unstable, the slope cutting displacement monitoring tests were carried out on a site of slope under construction. The test results, the macroscopic surface features in excavation and the numerical analysis results were studied comprehensively. The conclusions are achieved as follows： When the displacement monitoring curves show retracted on the upside and tympanic in the under-part, it corresponds to the absolutely stable state of the cutting slope, and the deformation of the slope mainly owes to the differential rebound effect in cut unloading; when the displacement monitoring curves show growing displacement on the upside and unaltered displacement in the under-part, it corresponds to a state of the slope liable to unstable, and the differential rebound effect is reduced in cut unloading.

关 键 词：路堑边坡 开挖 变形监测 现场试验 稳定性评估 

分 类 号：TD853.34[矿业工程—金属矿开采]