陕南秦巴山区受气象水文、地形地貌、地质构造、地层岩性及人类工程活动等因素的影响, 地质灾害频繁发生。 对陕南28 个县( 区) 的县域地质灾害区划资料进行统计分析, 深入探讨陕南秦巴山区地质灾害分布规律及其与各因 素的相关性, 得出结论: 地质灾害沿主要河流、断裂、交通干道两侧一定范围内呈/ 带状0分布; 地质灾害集中发育于 年平均降雨量小于1 000 mm 的区域, 灾害点密度随年平均降雨量的增大而减小, 年平均降雨量小于800 mm 的区 域灾害点密度最大; 多数滑坡主要发生倾角范围在为20b~ 40b范围内; 崩塌主要发生在多数崩塌倾角范围为40b ~ 60b范围内; 地质灾害集中发育于中低山区; 地质灾害集中分布在泥盆系和元古宇地层岩性区; 断裂的规模越大, 对 其两侧地质灾害发育的影响也越大, 深大断裂凤镇2山阳断裂带灾害点密度最大; 宝成铁路两侧1 km 范围内灾害点 密度最大。分析结论为陕南移民搬迁提供可靠的地质灾害防治依据。

Due t o the impact factor s such as climate, hydrolog y, geomorpholog y, geolog ical str ucture, lit ho lo gy , and human activ i2 ties, g eolog ical hazards occur often in Qinling2Daba mo untain a rea. St atistical analysis was per formed o n the geo lo gical hazar d reg ionalization in 28 co unties o r distr icts of south Shaanx i Pro vince, and the distr ibut ion r egular ities of g eolog ical hazards and the relationship betw een geo log ical haza rds and impact factor s w ere inv est igated. T he results show ed that( 1) the g eolo gical haz2 ar ds show banding distributio n along bo th sides of main r iver s, fractures, and ro ads; ( 2) the g eolog ical hazards occur mostly in the ar ea with an aver age annual rainfall less than 1000 mm. The hazar d density decr eases w ith the incr easing of aver age annual rainfall, and the hazard densit y is the g reatest in the a rea w ith an averag e annual rainfall less than 800 mm; ( 3) mo st of the land2 slides o ccur in the slo pes wit h an angle betw een 20 to 40b; ( 4) most of the collapse occur in the slopes w ith an angle between 40 to 60b; ( 5) the g eolo gica l hazards ar e mainly located in the middle and low er mo untain area, and in the litholog ic units o f Devo ni2 an and Proter ozoic eonot hem; ( 6) the effects of fr act ur e on t he g eolo gica l hazar ds on its sides enhance with t he increasing scale of fracture; and( 7) t he haza rd density is t he g reatest in the Feng zhen2Shanyang deep f racture and the area within 1 km to the Baoji2Cheng du r ailw ay. The research results can pro vide scientif ic and r eliable basis fo r the g eolog ical disaster pr evention in mi2 g rat ion relocatio n.

陕西省科技计划项目) 社会发展公关计划( s2012sF3082)