本文選題：超孔隙水壓力 + 黃土滑坡��； 參考：《人民長江》2017年11期

【摘要】：20世紀(jì)60年代以來,大量的灌溉系統(tǒng)在黃土地區(qū)建設(shè)運營,解決了農(nóng)業(yè)的干旱問題,但同時灌溉也誘發(fā)了大量的滑坡。其中,2015年1月28日20:00,甘肅省永靖縣焦家村發(fā)生了一起中等規(guī)模的黃土滑坡,滑坡嚴(yán)重影響其下方309國道線和六盤峽水庫的安全。采用對裂縫分布、水文地質(zhì)的調(diào)查,結(jié)合低空攝影測量、精細工程地質(zhì)測繪、室內(nèi)三軸試驗等研究方法,對焦家4號滑坡的基本特征進行了分析,對形成滑坡的成災(zāi)機理有了初步認(rèn)識。結(jié)果表明:(1)滑坡發(fā)生前,后緣裂縫有明顯的變形情況;(2)滑坡滑動距離為548.3 m,體積為15.35萬m~3,面積為6.6萬m~2;(3)飽和黃土應(yīng)力應(yīng)變模式表現(xiàn)為強烈的應(yīng)變軟化剪縮型,并具有一定的靜態(tài)液化特性;(4)滑坡是飽和黃土層靜態(tài)液化引起的。
[Abstract]:Since the 1960s, a large number of irrigation systems have been built and operated in the loess region, which has solved the problem of agricultural drought, but at the same time irrigation has also induced a large number of landslides. Among them, at 20: 00 on January 28, 2015, a moderate loess landslide occurred in Jiaojia Village, Yongjing County, Gansu Province, which seriously affected the safety of the 309 National Highway Line and the Liupanxia Reservoir under the landslide. The basic characteristics of Jiaojia No. 4 landslide are analyzed by means of crack distribution, hydrogeological investigation, low-altitude photogrammetry, fine engineering geological mapping and indoor triaxial test. The mechanism of landslide formation is preliminarily understood. The results show that: (1) before the landslide occurs, the fracture in the rear edge has obvious deformation, (2) the sliding distance of the landslide is 548.3 m, the volume is 153500 mm3, the area is 66000 mm2, (3) the stress-strain model of saturated loess shows a strong strain softening shear shrinkage type. The landslide is caused by the static liquefaction of saturated loess.
【作者單位】： 成都理工大學(xué)地質(zhì)災(zāi)害防治與地質(zhì)環(huán)境保護國家重點實驗室;
【基金】：國家重點基礎(chǔ)研究計劃(973計劃)資助項目(2014CB744703) 國家創(chuàng)新研究群體科學(xué)基金項目(41521002) 國家杰出青年科學(xué)基金項目(41225011)
【分類號】：P642.22

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