岩质边坡稳定分析 ().ppt

崩塌、滑坡名称第二节岩质边坡应力分布特征岩质边坡应力分布特征⑵影响边坡岩体应力分布的主要因素坡形

影响岩体

结构

的影响第三节边坡岩体变形和破坏边坡岩体变形和破坏岩体结构
指：边坡岩体主要在重力作用下向临空面方向发生长期缓慢
的塑性变形的现象岩崩：坚硬岩体中发生的崩塌4.滑坡湖北秭归县沙镇溪千将坪特大滑坡全貌⑵
形态
特征浅层滑坡（滑动面埋深仅数米）
⑷滑坡的形成机制力学性能
5.影响边坡稳定性的因素定性分析—工程地质分析假定条件②滑动面为折面时的一般计算（推力法）计算第一步：计算第二步：计算第n步①赤平极射投影图及作图原理投影原理：★过球心任意空间线的投影★过球心任一空间斜面的投影请作出结构面125°∠45°、60°∠30°、315°∠70°的赤平极射投图赤平极射投影图正规作图步骤②岩体滑动方向的图解分析③滑动可能性分析●由两组结构面控制的斜坡其坡面和结构面的投影线特征为：其坡面和结构面的投影线特征为：其坡面和结构面的投影线特征为：其坡面和结构面的投影线特征为：7.不稳定边坡的防治措施地下水防范水措施注意选择好削坡位置修建支档建筑适用于对岩质不稳定边坡的加固喷射混凝土护面设置马道减缓坡度柔性支护⑶导石网系统的形式与固坡网系统基本相同，但仅在防护区域的上（和下）沿锚固，限定落石的移动范围。适用于施工极其困难、工期特别短的边坡防护工程。生态护坡Note:4photoshereGrosVentreLandslideWyoming
Traits:
largesthistoricslideinU.S..
June23rd,1925.
40millionmetrictons.
followedheavyrainsandsnowmelt.
formed40-60meterdeeplake.
bedsdippingparalleltoslope.
ranchdestroyedbyrisinglake.
1927breakoutflood.
ViewfromGrandTetonmountainsacrossvalleytoEtoGrosVentreRangeandlargeflakescaronmountainside.UpperpartofslideshowingwherebasalslipsurfaceatbottomofTensleepsandstone(ontopofAmsdenFormationclaybeds)isexposed.Noteintactsliverwithtreeshalfwaydownbarescarp.ViewfrominteriorofhummockytoetoothersideofvalleywhereTensleepsandstonerodeupandagainstinplaceChugwaterredclastics.Viewfromheadscarpscarwithsnowtotranslationalslideblockinmiddletohummockytoeatbase.Thislandslideformedalinewithcrescentscarps.AnearthflownearInterstateHighway70,EllsworthCounty.Theheadistheupslopeportionofthelandslide.Thescarp,thesteeplyinclinedfailuresurfacewithexposedsoilandrock,marksthetopofalandslide.Thetoeisthedownslopeportionofthelandslide.Amoundofsoilcalledalobemarksthetoeofthelandslide.
RECOGNITIONOFAREASOFPOTENTIALSLOPEFAILURE(25)
IMainTopics
AMotivation
BSignsofslopeinstability
http://anaheim-landslide.com/
IIMotivation
AMostlandslides(orpotentialslides)canberecognizedorpredictediftheproperinvestigations
areperformedinadvance.
BExceptforsmallslides,slidestypicallycostfarlesstopreventthantofix(Anounceof
reventionisworthapondofcure...).
CMassiveslidesmaycostmanytimesthecostofthedesiredfac