【摘要】：自1976年引水灌溉以來(lái),涇陽(yáng)南塬黃土滑坡頻發(fā)。2016年3月6日發(fā)生的蔣劉4~#滑坡呈近流體狀高速遠(yuǎn)程運(yùn)動(dòng),并呈長(zhǎng)帶狀堆積于前緣平坦地面。其獨(dú)特的運(yùn)動(dòng)堆積特征與該區(qū)其他類(lèi)型滑坡差異顯著,具有一定的特殊性。本文基于野外地質(zhì)調(diào)查,通過(guò)無(wú)人機(jī)航測(cè)、現(xiàn)場(chǎng)含水率試驗(yàn)以及室內(nèi)試驗(yàn)等手段,對(duì)蔣劉4~#滑坡進(jìn)行分析研究。結(jié)果表明:(1)滑坡呈高速遠(yuǎn)程運(yùn)動(dòng)、長(zhǎng)帶狀堆積,堆積體天然密度表現(xiàn)出從斜坡坡腳至前緣陡坎先增大,越過(guò)陡坎后明顯減小的趨勢(shì);(2)滑源區(qū)黃土以粉粒為主、黏粒含量較少的粒組成分以及黃土中次生礦物含量較高是蔣劉4~#滑坡形成的物質(zhì)基礎(chǔ);(3)大面積灌溉以及引水渠漏失嚴(yán)重造成大量水體下滲,該區(qū)S5古土壤層形成的相對(duì)不透水底板為上層滯水聚集創(chuàng)造了條件,使近底板上覆黃土處于飽水狀態(tài),導(dǎo)致斜坡穩(wěn)定性降低;(4)地貌上剪出口位置較高,滑體潛在勢(shì)能大,坡腳人工開(kāi)挖的多級(jí)陡坎為滑坡高速遠(yuǎn)程運(yùn)動(dòng)創(chuàng)造了有利條件。蔣劉4~#滑坡規(guī)模較小但流動(dòng)性顯著,作為近年來(lái)蔣劉一帶滑坡發(fā)展演化的主要類(lèi)型,研究其運(yùn)動(dòng)堆積特征及流動(dòng)性成因,為科學(xué)防治滑坡具有一定指導(dǎo)意義。
[Abstract]:Since the water diversion and irrigation in 1976, the loess landslides in the south and south of the Yangtze River have been frequent. The Liu4-# landslide, which occurred on March 6,2016, is in close fluid-like high-speed and long-distance motion, and has a long strip-shaped accumulation on the flat surface of the leading edge. The unique characteristics of the movement accumulation and other types of landslides in this area are significant and have some special characteristics. Based on the field geological survey, this paper makes an analysis and research on Liu 4 ~ # landslide by means of unmanned aerial vehicle aerial survey, on-site water content test and in-room test. The results show that: (1) the landslide is high-speed remote movement, long strip-shaped accumulation, and the natural density of the accumulation body shows that the slope of the slope toe to the leading edge is increased firstly, and the trend of the obvious reduction after crossing the steep canis; and (2) the loess of the sliding source region is dominated by the powder and the powder, The small grain composition and the higher content of secondary mineral in the loess are the material base of the formation of the Liuliu 4 ~ # landslide; (3) the large-area irrigation and the leakage of the diversion canal seriously cause a large amount of water to be drained, the relative water-impermeable bottom plate formed by the S5-old soil layer in the area creates a condition for the upper-layer stagnant water, so that the loess-covered loess on the near bottom plate is in a water-saturated state, so that the stability of the slope is reduced; (4) the position of the cut-off outlet in the landform is high, the potential potential energy of the sliding body is large, The multi-stage scarp of the artificial excavation of the slope toe creates favorable conditions for the high-speed remote movement of the landslide. The scale of Jiang Liu 4 ~ # landslide is small but the fluidity is remarkable. As the main type of the landslide development and evolution in recent years, it is of great significance to study the characteristics of its movement and the cause of its fluidity.
【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(hù)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃)(2014CB744703) 國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目(41630640)資助
【分類(lèi)號(hào)】：P642.22

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