四川汶川县银杏乡地震灾后重建安置区地质灾害及防治

银杏乡是距离5.12汶川大地震震中映秀最近的乡镇之一,地震导致全乡618人死亡,11人失踪,近千人受伤,88%的房屋倒塌,灾害损失极为严重。本文在实地调查的基础上,分析了区域地质环境背景,对银杏乡东界脑村、兴文坪村、一碗水村、沙坪关村、桃关村等10处灾后安置区的地质灾害发育特征和灾害成因进行了初步研究,研究发现安置区共有滑坡、崩塌危岩和泥石流灾害62处,灾害规模较小,暴发频率较高,绝大多数地质灾害均属本次汶川地震的次生地质灾害。结合对未来灾害发展趋势的分析,文章提出了防灾减灾的对策和建议。

Geologic hazards and mitigation countermeasures in rehabilitation sites after May 12,2008 Wenchuan earthquake of Yinxing town,Wenchuan,Sichuan Province

Yinxing is one of the nearest towns of Yinxiu,the Epicenter of May 12,2008 Wenchuan Ms 8.0 Earthquake,During the eathquake,618 people are killed and 11 are lost,about one thousand pelple are wounded,and 88%houses are seriously destroyed,Based on field investigation of geologic environment and background of geologic hazards,the character and formation causes of geologic hazards in 10 rehabilitation sites of Xingwenping,Dongjienao,Yiwanshui,Shapingguan and Taoguan village,etc preliminaily studied in this paper.It is found that there are 57 landslides,collapses and edbris flows in the studied area after earthquake,most of hazards are in small scale with high occurring frequencies.Through analy-sis of developmental tendency of regionalgeolonal geologic hazards,the mitigation coutemeasures are put forwarded at last.