都江堰—汶川公路地质灾害特征及形成机制初步研究

汶川特大地震发生后,都江堰—汶川公路两旁地质灾害尤为发育,先后多次完全中断震中生命线的交通,严重影响了公路的安全运行和灾后重建的加快进行。为有效防灾和减灾,本文立足于野外考察和对已有资料的分析,对该地区开展了区域性地质灾害研究。研究表明,区内地质灾害具有以下几个显著特征:在分布上,沿公路呈线性带状密集发育、类型多、分段性显著; 成因复杂的高陡岩土体是地质灾害的主要物质基础; 强烈的场地地震效应和内外动力耦合作用是该地区地质灾害形成、发生的重要因素。本文为该区域地震地质灾害的成灾机理和防治措施的研究提供了科学依据。

CHARACTERISTICS AND FORMATION MECHANISM OF GEO-HAZARDS TRIGGERED BY WENCHUA MS.8.0 EARTHQUAKE ALONG DUJIANGYAN TO WENCHUAN HIGHWAY

Geo-hazards that triggered by the Wenchuan Ms8.0 earthquake along the Dujiangyan to Wenchuan Highway are especially severe and have seriously affected the safe riding along the highway and the reconstructions.In order to prevent and reduce disasters effectively,regional geological hazards have been studied in the area on the basis of the field investigations and statistic analysis of available data.The results show the following three prominent characteristics of hazards in the area: in terms of distribution geologic hazards are linear ribbon and intensively,have many types and are notably divided into sectors; the high and steep rock deposits of complex origin form the main material foundation of geological hazards; intense earthquake effect and coupling of androgenic and exogamic forces are the important factors for the formation and occurrence of geological hazards in the area.This paper provides a scientific basis for the study of the mechanism of occurrence of the geo-hazards triggered by earthquake in the area and measures for their prevention and control.