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公路边坡灾害应急处治措施分析及其效果评价

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降雨所引起的边坡灾害,具有一定的突发性,如何迅速有效地进行边坡灾后处治,具有重要的经济和社会意义.本文以广东省某高速公路路堑边坡为例,在分析边坡灾害原因的基础上,利用FLAC3D软件对应急处治设计方案中的削方卸载和锚索格梁加固效果进行模拟分析,并通过变形监测对其进行评价.研究结果表明,在削方体积和各级削方坡率大致相同的情况下,宜在边坡中部设置大平台,其次是在坡顶;在边坡中部削方卸载,形成大平台之后,要同时注重大平台所在的边坡和一级边坡的加固;和加固的位置的不同相比,削方位置的不同对边坡稳定性(安全系数)的影响相对较小;削方形成的大平台和预应力锚索的加固,都会在不同程度上影响边坡滑面的发展,如滑面深度、剪出口位置等;变形监测结果表明应急处置措施效果良好,有效遏制了边坡进一步失稳滑塌.
Analysis of Emergency Treatment Measures for Highway Slope Disasters and Evaluation of Their Effectiveness
Rain-induced slope disasters are sudden and require rapid and effective post-disaster treatment,which has significant economic and social implications.This article took a highway cutting slope in Guangdong province as a case study to analyse the causes of slope disasters.FLAC3D software was used to simulate the effect of cutting unloading and anchor grid beam reinforcement schemes in the emergency treatment design,the evaluation of which is conducted by deformation monitoring.The results showed that with approximately the same cutting volume and slope rates at all levels,it is advisable to set up large platform in the middle of the slope,followed by the one at the top.After cutting and unloading in the middle of the slope to form a large platform,it was essential to reinforce both the slope where the large platform is located and the first level slope.Compared to the differences in reinforcement positions,the different cutting positions had a relatively small impact on the stability of the slope.The large platform formed by cutting and the reinforcement of prestressed anchor cables will affect the development of the slope sliding surface,,such as the depth of the sliding surface,the position of the shear outlet.Deformation monitoring results showed that the emergency treatment measures can effectively prevent the further instability and sliding of the slope.

slope engineeringrainfallemergency treatmentnumerical simulation

李才智、梁勇、卢浩、李清

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广东省路桥建设发展有限公司汕湛分公司,广东 梅州 514453

广东省路桥建设发展有限公司,广东 广州 510623

广东交科检测有限公司,广东 广州 510550

边坡工程 降雨 应急处治 数值模拟

2024

广东公路交通
广东省交通科技有限公司

广东公路交通

影响因子:0.311
ISSN:1671-7619
年,卷(期):2024.50(6)