卓福泥石流成因分析和减灾措施

2003年5月4日至7月8日,张家界地区出现连续的降雨过程,累计降雨量达509 mm;7月8日~10日为强降雨过程,7月9日爆发强大的卓福泥石流。卓福泥石流位于焦柳铁路K 996+654.6~K 996+750.4段,其冲毁路基,覆盖线路深20余米、长100余米,使轨道呈麻花状并被横推3 m多远,涵洞堵塞。对卓福泥石流的成因进行了分析,该处的地形、地质因素是泥石流爆发的客观条件,长时间的前期降雨及短历时的强降雨过程是泥石流爆发的诱因。介绍了灾后排水、减载及整道等抢险措施和修建坡面排水系统、明洞及抗滑桩等整治措施。

The Cause and Controlling Countermeasures of Zhuofu Debris Flow

From 4 May to 8 July 2003,Zhangjiajie region of Hunan province experienced prolonged rainfall,with cumulative precipitation values exceding 410 mm of rain in 12h.On July 9,Zhuofu landslide was triggered,and resulted in a large=scale debris flow,A great deal of sediment transported by the debris flow deposited on the rail and jammed the river which made some disasters.The main reason that triggered debris flow was special topography,gecological structure and unstable loose material state of the valley,The following factors that induced debris flow are a great dcal of antecedent rainfall and intense short-duration rainfall.The emergency salvage treatment inculuded cutting groove for drainage,reducing load,and renewing rains.Some measures,such as setting up drainage system,building slide resistant piles,and constructing cut-and cover-tunnel,are taken to prevent and control debris flow.