复式滑坡灾害防治工程剖析——国道108线广元南段某滑坡防治工程实例

Analysis of a controlling project for a compound landslide——A case study along No.108 National Highway

论文以国道 10 8线广 (元 )南段某特大型滑坡为例 ,介绍该复式滑坡的形态结构特征、成因机制 ,阐述了滑坡极体内Ⅰ、Ⅱ、Ⅲ级滑面 (带 )特征 ,分析了该滑坡前期工程治理失败的原因。针对该滑坡体内多级滑面 (带 )的形成特点及结构特征 ,提出了以重力式挡墙支护浅、表层滑体 ,抗滑桩锚固深层滑体 ,滑体后缘高陡边坡采用锚杆支护等 ,并结合后缘地表排水、前缘利用泄水孔排泄地下水及土工织物护岸防冲刷等综合防治措施 ,提高了滑坡的稳定性 ,确保了工程顺利进进。不仅保证了工程质量 ,而且缩短了工期 。

Taking a super\|large scale landslide along No.108 National Highway as an example,the characteristics and the formation mechanism of the compound landslide have been introduced in detail.The previous controlling project was not effective and the reason why it was so has been analysed.Based on the description of the properties of the slipping surfaces within the landslide body,the cause of the failure has been made clearly.Regarding to the structure of multi\|level sliding surfaces,the retaining wall for supporting sliding body,anti\|sliding piles for anchoring deeper sliding body,and bolts shotcrete for supporting steep slope of the sliding wall have been designed.In the meantime,a series of countermeasures,such as surface drainage at the back of the landslide,groundwater drainage at the front of the landslide,as well as bank protection,have been taken.The stability has thus been improved and the controlling project has been carried out smoothly with higher quality and lower cost.Furthermore,the working period is shorter than scheduled.