Mapping of Slope Failures on Highway Embankments using Electrical Resistivity Imaging (ERI), Unmanned Aerial Vehicle (UAV), and Finite Element Method (FEM) Numerical Modeling for Forensic Analysis

使用电阻率成像、无人机和有限元法数值模型取证分析法绘制

公路路堤斜坡滑坡图像

Nobahar M.; Salunke R.; Alzeghoul O.E.; Khan M.S.; Amini F.

诺巴哈·M.；萨伦克·R.；阿尔泽古尔·O.E.；汉·M.S.；阿米尼·F

Highway Embankment Fill Slope is one of the significant components of transportation geo-infrastructures assets. Embankments failure is a common problem that occurs due to various geotechnical, climatological, and environmental contributing parameters. Major influential factors include high temperature, high rainfall volume, and type of soil or a combination of all the above. For instance, when a slope built on high swell-shrinkage clay soil fails abruptly, it is due to the weakened self-retaining ability of the soil due to excess pore water pressure from high rainfall events. In Mississippi, rainfall is very intense, and lately, it is often characterized by aggressive showers. This rainfall generates significant soil strength losses that can endanger the safety and durability of embankments. Most embankments in the Jackson metro areas are constructed using Yazoo clay which is a typical High Swell-Shrinkage Clay Soil. These embankments have been found to experience shallow to deep failures a few years after construction due to the shrink-swell cycles during seasonal variations. These frequent failures have caused a significant maintenance problem for the Mississippi Department of Transportation (MDOT). Therefore, methods and approaches to evaluate embankment failures have been subject to careful examination by the MDOT by employing multiple investigations means, including Non-Destructive Testing (NDT) methods. To this end, in this study, Unmanned Aerial Vehicle (UAV), Electrical Resistivity Imaging (ERI), and Finite Element Method (FEM) numerical modeling were used to analyze shallow failure mechanisms within slopes. Several failed slopes located in the Jackson metro area in Mississippi were considered as references. The objective of the current study is to highlight the differences between pre- and post-monitoring, evaluative, and analytic actions regarding embankments experiencing failure. During this study, four failed embankments were investigated using ERI and UAV to identify and locate the failed geometry, including slip surfaces. To better understand the failure mechanism, the identified embankments failure slip surfaces were numerically modeled using the FEM software package Plaxis 2D. Soil-strength parameters at failure were extracted through back calculation, and failure/slip surface depth was numerically characterized. The finding of this study helps post-embankments failure forensic evaluations significantly in terms of understanding failure mechanisms, identifying contributing failure parameters, better managing the decision-making process, and selecting an optimized stabilization technique.

公路路堤填土坡是交通地质基础设施资产的重要组成部分之一。由于各种岩土、气候和环境因素的影响，路堤损坏很常见。主要影响因素包括高温、高降雨量、土壤类型及上述各因素综合。例如，建在高胀缩粘性土上的斜坡突然滑坡，这是由于降雨量大，孔隙水压力过高，从而导致土壤自持能力减弱。在密西西比州，降雨量非常大，经常出现强阵雨。这种降雨大幅度减弱土壤强度，威胁到堤坝的安全和耐久性。杰克逊市的大多数堤坝都用雅祖（Yazoo）粘土建造，这是一种典型的高胀缩粘土。由于季节变化期间的收缩-膨胀循环，这些路堤在建成几年后就会出现从程度不同的滑坡，这则给密西西比州交通局（MDOT）带来了繁重的维护任务。因此，该交通局通过无损检测（Non-Destructive Testing, NDT）等多种方法，对评估斜坡滑坡的方法和途径进行了仔细研究。为此，该研究采用无人机（UAV）、电阻率成像（ERI）和有限元法（FEM）数值模型分析斜坡内的浅层滑坡机制，并以密西西比州杰克逊都市区的几个斜坡滑坡案例作为参考。该研究的目的是分析滑坡路堤前后监测、评估和分析行动间的差异。这项研究包含四个路堤滑坡案例，这些都是通过电阻率成像和无人机调查确定和定位它们的几何形状，包括滑移面。为了更好地理解滑坡机制，使用有限元软件包Plaxis 2D对确定的堤坝滑坡滑移面进行了数值建模。在反演计算后，得出了滑坡时的土体强度参数，并对滑坡/滑移面深度进行了数值估算。本研究结果对有助于分析堤坝滑坡后的情况，尤其是在了解破坏机制、确定破坏参数、更好管理决策过程、选择最佳稳定技术方面。

Keywords: Highway Embankment; Electrical Resistivity Imaging (ERI); Unmanned Aerial Vehicle (UAV); Finite Element Method (FEM)

关键词：公路路堤；电阻率成像；无人机；有限元法

来源:中国知网

发表时间：2023

来源：

Journal：Transportation Geotechnics

https://scholar.cnki.net/zn/Detail/index/GARJ2021_4/SJESDBE36FB0F265F668F49762A81E272A78

检索：徐妍

翻译：缪辉

一审：杨晨晨

二审：彭莉

三审：罗玲娟

上传发布：姜浩