山西晋-阳高速公路滑坡勘察及治理

Landslide exploration and treatment in Jin-Yang Highway

晋-阳高速公路为山西省晋城市至阳城县路段,于1997年9月底竣工通车.1998年雨季后,晋-阳高速路南侧先后发生4处滑坡,严重影响公路交通运行.其中2处滑坡严重威胁北音村居民及住宅安全,引起山西省交通厅高度重视.并将晋-阳高速公路滑坡勘察治理做为省厅重点工程.晋-阳高速公路滑坡均位于公路挖方地段,受地形、地貌、地质、构造控制及降雨影响,形成顺层浅层牵引式滑坡.滑坡的形成属工程诱发型蠕滑.滑坡平面上呈平行于高速公路的长条形,滑体裂隙发育,一般有2～4条明显张裂隙,裂隙最宽达150 cm以上.滑动面为石炭系黄色、灰白色流塑状泥岩,滑动面平整光滑如镜,泥化层厚10 cm左右.由于形成滑床的泥岩厚度大,分布稳定,且无断裂构造,其下部不可能再产生滑动面.因此,滑坡为单层滑动.通过滑坡推力计算,4处滑坡最大滑坡推力介于24.2～64.1t/m之间.根据滑坡特征及其形成原因,滑坡治理采用了排水、填缝、重力挡墙、抗滑桩等综合措施.时至2004年春.4处滑坡稳定、安全.滑坡治理取得了良好的效果.

Jin-Yang Highway,from Jincheng County to Yangcheng County in Shanxi Province,was completed in September1997.Since the rain season in1998,there have been altogether4landslides in its southern section,which did great harm to the public transport service in consequence,and2of which posed a grave threat to the safety of the residents and buildings of Beiyin Village.Shanxi Provincial Transport Department has attached great importance to this and enlisted the investigation and renovation of Jin-Yang Highway as one of their key engineering projects.The landslides of Jin-Yang Highway were all located at the cubage site of excavation and under the influence of the topography,configuration,composition and structure of the earth' s crust,tectonic restriction and rainfall.Hence the shallow along-layer pulling landslides came into being.They fall into the category of engineering-induced creeping landslideds.Their plane took oblong forms,parallel to the Highway proper.The crevice was in full development.Usually there were2to4obvious cracks caused by tension,the widest one was over150cm.The landsliding plane was made of yellow or grayish-white carboniferous mudstone with plastic-streaming,as smooth and level as a mirror.And the modification layer was as thick as about10cm.Because the mudstone was quite thick and evenly distributed,with no fracture structure,it was not possible to form a landsliding plane underneath.Hence the landslide was unlined and insubstantial,of a single layer.According to calculation,its maximum pulling force ranged from24.2t/m to64.1t/m.With the characteristics and formation causes of the landslides fully taken into consideration,comprehensive renovation measures,such as displacing water,stuffing gaps,putting up gravitational retaining walls and anti-sliding piles,have been taken.Up to now,the afore-mentioned4landslides have been safe and steady,and remarkable renovation achievements have been attained.