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“5.12”汶川特大地震的发震断裂从北川县城穿过,地震时北川县城烈度大于等于10°;地震引发北川县城周围多处山体滑坡、崩塌次生灾害;对北川县城造成了毁灭性破坏,使其成为“5.12”地震中受损最为严重的县城。灾后重建必须把城市安全放在第一位,而城市安全主要取决于地质条件及其安全性。在搜集整理、分析研究大量资料和现场工程地质调查的基础上,首先研究北川县城原地重建的可能性,并提出备选场址比较方案;综合研究原县城驻地、备选场址的地形地貌、地质构造、新构造运动与地震、工程地质、水文地质、不良地质作用与地质灾害等地质安全要素,按照“以人为本、安全第一”的原则,最终推荐安昌东南作为北川新县城灾后重建场址。
The earthquake of Wenchuan earthquake passed through Beichuan County. The intensity of Beichuan County was greater than or equal to 10 ° during the earthquake. The earthquake triggered landslides and secondary disasters around Beichuan County. It caused devastating impact on Beichuan County Destroyed, making it the most damaged county in the “5.12” earthquake. Post-disaster reconstruction must give top priority to urban safety, while urban safety depends primarily on geological conditions and its safety. On the basis of collecting and analyzing a large amount of data and on-site engineering geological survey, the paper first investigates the possibility of rebuilding Beichuan county in situ and puts forward a plan for comparison of alternative sites. By comprehensively studying the topographic features of the original site and alternate sites In accordance with the principle of “people-oriented and safety first”, geology and geomorphology, neotectonic movement and earthquake, engineering geology, hydrogeology, adverse geological effects and geological disasters and other geological safety elements finally recommended that Anchang southeast as the Beichuan new county post-disaster Reconstruction site.