本文關(guān)鍵詞： 黃土滑坡 灌溉水入滲 離心模型試驗(yàn) 黑方臺(tái)　出處：《人民長(zhǎng)江》2017年S1期 　論文類型：期刊論文

【摘要】：黑方臺(tái)從開始農(nóng)業(yè)提灌以來(lái),持續(xù)發(fā)生成群滑坡,臺(tái)緣部位密集裂縫逐年增加,滑坡規(guī)模和頻率呈逐年增大趨勢(shì)。以黑方臺(tái)焦家13號(hào)滑坡為地質(zhì)原型,利用原狀黃土制成1:200室內(nèi)灌溉模型,采用大型土工離心機(jī)進(jìn)行離心試驗(yàn)。試驗(yàn)結(jié)果表明:(1)自制灌溉水模擬裝置,能有效模擬不同灌溉程度(不同滲透水量和滲透深度);(2)灌溉誘發(fā)黃土滑坡變形及破壞程度與灌溉水入滲階段密切相關(guān),主要分為灌溉水下滲階段、地下水壅高階段、初次剪滑階段、溯源滑動(dòng)階段,由此可以判識(shí)灌溉水滲流階段及該類滑坡發(fā)育階段;(3)該類滑坡形成機(jī)理為:灌溉水下滲、阻水層地下水壅高→阻水層上部黃土軟化、蠕滑(峰值強(qiáng)度)→坡腳泥流潛蝕、前緣剪滑(殘余強(qiáng)度)→前緣臨空、溯源滑動(dòng)、后緣新拉裂。研究再現(xiàn)了灌溉誘發(fā)黃土滑坡形成過(guò)程,指出了灌溉水與黃土相互作用的致災(zāi)機(jī)理,可為灌溉誘發(fā)黃土滑坡研究提供試驗(yàn)依據(jù)。
[Abstract]:Since the beginning of agricultural irrigation and irrigation, the Heifangtai landslide has continuously occurred in groups, the dense cracks in the edge of the platform have been increasing year by year, the scale and frequency of the landslide have been increasing year by year, and the Heifangtai Jiaojia No. 13 landslide is taken as the geological prototype. An indoor irrigation model of 1: 200 was made from undisturbed loess, and centrifuge tests were carried out with a large geotechnical centrifuge. The experimental results showed that the irrigation water simulator was made by ourselves. It can effectively simulate the deformation and damage degree of loess landslide induced by different irrigation degree (different permeable water quantity and infiltration depth), which is mainly divided into irrigation water infiltration stage and groundwater accumulation stage, and the damage degree is closely related to irrigation water infiltration stage. The formation mechanism of this kind of landslide is as follows: infiltration of irrigation water and high level of underground water in blocking layer. 鈫扡oess softening and creeping (peak strength) in the upper water-resistance layer. 鈫扴lope foot mudflow erosion, front shear slip (residual strength). 鈫扵he forming process of loess landslide induced by irrigation is reappeared, and the mechanism of interaction between irrigation water and loess is pointed out, which can provide experimental basis for the study of loess landslide induced by irrigation.
【作者單位】： 四川省交通運(yùn)輸廳公路規(guī)劃勘察設(shè)計(jì)研究院;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;
【分類號(hào)】：P642.22

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