应力监测在公路岩质边坡中的应用研究  

Application of stress monitoring to highway rock slope

作　　者：郭永建[1,2] 王少飞[3] 李文杰 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]长安大学公路学院,西安710064 [4]广东省公路建设有限公司,广州510600

出　　处：《岩土力学》2013年第5期1397-1402,共6页Rock and Soil Mechanics

基　　金：西部交通建设科技项目(No.2009310000003)

摘　　要：针对山区高速公路岩质边坡数量大、失稳难以及时预警的问题,提出对边坡支护锚杆进行应力监测的方式以评价其稳定性。以广陕高速改扩建工程沿线的一处典型岩质边坡为例,采用FLAC3D软件对岩质边坡的开挖支护过程进行模拟,利用强度折减法分析随岩体强度降低过程中支护锚杆的轴力变化规律,确定应力监测预警值,并结合现场试验结果对边坡安全状况进行评价。研究结果表明,试验边坡监测位置应以泥岩结构面处为主,应力监测预警是一个整体的预警系统,监测点位任一处达到预警值均应提出预警。监测结果显示,应力监测在120 d时出现明显变化,而位移变化则较为滞后,在167 d后才出现明显变化;综合应力与位移监测的结果可以得出,试验边坡处于安全运营状态,所提出的应力监测评价公路岩质边坡的稳定性具有可行性。In light of the problems of that the highway rock slopes have large numbers and slope stability is hardly to predict in time, the stress monitoring method of the anchoring rock bolt is used to evaluate slope stability. Typical slope along Guangyuan- Shaanchuan expressway reconstruction as the example, the FLAC3D software is taken to simulate the excavating and support process of the rock slope, and the strength reduction method is taken to analyze the change of rock bolt axial force during the rock mass strength reduction process, the monitoring values are obtained; and combined with the result of field test to evaluate the slope stability. The research results show that the mainly monitoring locations should be at mudstone structures, and the stress monitoring is a wholly system; so that the early warning should be made if axial force values at any locations reached the early warning values; The result of field test shows that the stress monitoring has obvious change at 120 d, while the displacement change has a time lag, it appear obvious change at 167 d; from the results of stress monitoring and displacement monitoring, a conclusion is drawn that the slope keep in a state of safety operation, so the proposed stress monitoring method can be applied to evaluate the highway rock slope stability.

关 键 词：道路工程 岩质边坡 应力监测 强度折减法 预警 

分 类 号：U416.1[交通运输工程—道路与铁道工程]