多期次泥石流堆积体上的公路地质灾害——以川藏公路二郎山隧道西引道公路别托段为例

我国西部交通干线多处于山岭地带,此类地区历史上产生的多期次泥石流堆积体在天然状态下具有较好的稳定性和结构强度,如何合理利用并避免产生工程地质灾害具有实际意义。本文通过分析二郎山隧道西引道别托段多期次泥石流堆积体的发育分布特征和演化趋势,对该路段内产生的滑坡、路基不均匀沉降以及桥基变形等公路工程地质灾害进行分析与评价,并指出在多期次泥石流堆积体上修筑公路时应注意的一些问题。 

HIGHWAY GEOLOGICAL HAZARDS OCCURRING ON MULTI-STAGE ACCUMULATIONS OF DEBRIS FLOWS--A CASE STUDY OF THE BIETUO SECTION OF THE WEST APPROACH OF THE ERLANG MOUNTAIN TUNNEL,SICHUAN-TIBET HIGHWAY

The main communication lines in western China are mostly located in mountainous areas,where in history there exist multi-stage accumulations of debris flows which have preferable stability and structural strength in the natural state.How to make rational use of this kind of accumulation and avoid occurrence of engineering geological hazards in highway construction has practical significance.In this paper the multi-stage accumulation of debris flows in the Bietuo section of the west approach of the Erlang Mountain tunnel along the Sichuan-Tibet Highway is selected to study its development,distribution and evolutionary trend,and then the highway engineering geological hazards such as landslides,uneven settlement of the roadbed and deformation of bridge foundation occurring in this section are analyzed and evaluated.At last the authors give some important advices for highway construction on multi-stage accumulations of debris flows.