高速公路边坡滑坡原因分析及防治对策——以京承三期高速公路(北京沙峪沟—市界段)为例

以京承三期高速公路(北京沙峪沟—市界段)为例,通过对滑坡边坡的形式、原因、特征进行调查与分析,提出相应的防治对策。结果表明:1)岩石边坡和土石边坡2种类型边坡滑坡的主要形式均表现为坡体失稳、合体下滑和间接滑坡3种形式,岩石边坡和土石边坡都以坡体失稳形式为主;2)排水工程问题是坡体失稳的主要原因,土石边坡主要表现为排水设施不完善,岩石边坡则表现为排水设计形式不合理;3)挂网锚固工程问题是合体下滑的主要原因,岩石边坡表现为刚性锚杆锚固效应不够、生物锚杆锚固效应有限,土石边坡则表现为刚性锚杆锚固效应有限、生物锚杆锚固效应不够;4)间接滑坡是边坡上坡位滑坡导致的。根据滑坡边坡存在的问题,从排水工程、加固工程等6方面对京承三期高速公路(北京沙峪沟-市界段)边坡防滑坡工作提出防治对策。

Causes and countermeasures to prevent and control slope landslide for freeway：The third period of Jingcheng freeway（Shayugou-city boundary section of Beijing）

Taken the slopes of the third period（Shayugou-city boundary section of Beijing） of Jingcheng freeway as example,this study surveys the forms and characteristics of the landslide,analyzes its reasons and give some control suggestions.Results show that,the forms of slope landslide occurred Slope-instability and Zoarium-decline and Indriection-landslide for both Rock slopes and Soil-rock slopes.Slope-instability was the most important form for the two slope types.By analyzing slope landslide causes,it can be obtained that Drainage Works could give the reason for Slope-instability form,i.e.faultiness on Soil-rock slopes and irrational design on Rock slopes.Stabilization Works could give the reason for the Zoarium-decline form,i.e.insufficient anchoring effect of anchor and limited anchoring effect of plants roots on Soil-rock slopes,vice verse on Rock slopes.The landslide of uphill could give the reason for Indriection-landslide form.In conclusion,some advices about landslide prevention were given according to the existing problems of these landslide slopes from Drainage Works and Stabilization Works and so on.