DOI:10.19807/j.cnki.DXS.2023-03-057滇西南红层滑坡稳定性分析与评价沈昌军(四川省地质工程勘察院集团有限公司,四川成都610036)[摘要]红层主要是指中生代以来的碎屑岩地层,在我国广泛分布。由于红层工程性质较差,在红层地区边坡工程常在降雨等作用下出现失稳。本文以云南景文高速公路滑坡为例,开展滑坡稳定性评价研究分析,研究结果表明:(1)滑坡的形成和发展变化受多种因素控制,其中地层岩性和地下水为主要成因。(2)红层泥岩具有强度低、遇水软化膨胀、失水干裂、崩解性强等特性。强降水和强蒸发使边坡地下水面附近岩体容易处于饱水-干裂-饱水的干湿循环状态,使岩体力学性质逐渐恶化。(3)红层滑坡滑动面多呈折线形,在计算滑坡稳定性时应结合现场实际情况,反演不同部位岩土力学参数,为滑坡防治提供计算依据。[关键词]滇西南;红层滑坡;高速公路;成因分析;稳定性[中图分类号]P642.22[文献标识码]A[文章编号]1004-1184(2023)03-0170-04[收稿日期]2022-07-07[作者简介]沈昌军(1984-),男,四川广安人,工程师,主要从事水文地质、工程地质与环境地质方面工作。Analysisandevaluationofthestabilityofred-beddedlandslidesinsouthwestYunnanSHENChang-jun(SichuanGeologicalEngineeringSurveyInstituteGroupLimited,Chengdu,Sichuan610036)Abstract:TheRedFormationismainlyaclasticformationfromtheMesozoiconwardsandiswidelydistributedinthecountry.Duetothepoornatureofredlayerengineering,slopeworksinredlayerareasareoftendestabilisedbyrainfallandothereffects.ThispapertakestheYunnanJingwenExpresswaylandslideasanexampletocarryoutlandslidestabilityevalua-tionresearchandanalysis,Theresearchresultsshowthat:(1)theformationanddevelopmentoflandslidesarecontrolledbyavarietyoffactors,ofwhichstratigraphiclithologyandgroundwaterarethemaincauses.(2)Redmudstonehaslowstrength,softeningandswellingwithwater,drycrackingwithwaterlossanddisintegration.Strongprecipitationandevaporationmaketherocknearthegroundwatersurfaceoftheslopesusceptibletoadryandwetcycleofsatiation-dryfracture-satiation,resultinginagradualdeteriorationofthemechanicalpropertiesoftherock.(3)Theslidingsurfaceofred-layeredlandslidesismostlyfoldedandlinear.Whencalcula...