本文關(guān)鍵詞： 黃土斜坡 降雨 滑坡 物理模型實驗 孔隙水壓力　出處：《工程地質(zhì)學(xué)報》2017年05期 　論文類型：期刊論文

【摘要】：黃土較松散,內(nèi)部大孔隙和垂直節(jié)理發(fā)育,因其特殊的結(jié)構(gòu)為雨水的快速入滲提供了通道。降雨型黃土淺層滑坡已造成了大量的經(jīng)濟損失與人員傷亡。為了有效減輕降雨誘發(fā)黃土滑坡對社會和經(jīng)濟的影響,開展降雨型滑坡室內(nèi)實驗研究,具有重大的現(xiàn)實意義。本文旨在研究不同降雨形式和不同坡體結(jié)構(gòu)對黃土斜坡變形破壞過程影響,設(shè)計并進行了3組室內(nèi)物理模型實驗,分別為持續(xù)強降雨斜坡實驗、持續(xù)強降雨斜坡(帶垂直節(jié)理)實驗和間歇性強降雨斜坡實驗,且每組斜坡內(nèi)埋設(shè)體積含水率傳感器、基質(zhì)吸力傳感器和孔隙水壓力傳感器3種傳感器記錄其內(nèi)部變化。通過對每一個黃土斜坡體內(nèi)傳感器的讀數(shù)變化及實驗現(xiàn)象進行分析,同時對不同實驗條件下實驗過程及結(jié)果進行對比,進而得出降雨條件下淺表層黃土滑坡的變形破壞規(guī)律,總結(jié)出該類滑坡的破壞模式及其誘發(fā)機理。實驗前期,隨著體積含水率不斷增大,基質(zhì)吸力逐漸減小至基本穩(wěn)定,土體強度隨之減小,實驗后期上部土體飽和,斜坡產(chǎn)生的變形和土體排水不暢產(chǎn)生了超孔隙水壓力,有效應(yīng)力隨之減小,土體強度減小至最小,導(dǎo)致滑坡產(chǎn)生。同時,坡體結(jié)構(gòu)對斜坡穩(wěn)定性的影響大于降雨形式的影響。
[Abstract]:Loess is looser, with internal macropores and vertical joints developed, Because of its special structure, it provides a passage for Rain Water's rapid infiltration. Rainfall loess shallow landslide has caused a lot of economic losses and casualties. In order to effectively reduce the impact of rainfall induced loess landslide on society and economy, It is of great practical significance to carry out indoor experimental research on rainfall landslide. This paper aims to study the influence of different rainfall forms and different slope structures on the deformation and failure process of loess slope, and designs and carries out three sets of indoor physical model experiments. The experiments are continuous heavy rainfall slope experiment, continuous heavy rainfall slope experiment (with vertical joint) and intermittent heavy rainfall slope experiment. Three kinds of sensors, matrix suction sensor and pore water pressure sensor, recorded their internal changes. At the same time, the experimental process and results under different experimental conditions are compared, and then the deformation and failure law of shallow loess landslide under rainfall condition is obtained, and the failure mode and induced mechanism of this kind of landslide are summarized. With the increasing of volume water content, the suction of the matrix decreases to the basic stability, the strength of the soil decreases, the upper part of the soil is saturated, the deformation of the slope and the poor drainage of the soil result in the excess pore water pressure. The effective stress decreases and the soil strength decreases to the minimum, which leads to the landslide. At the same time, the influence of slope structure on slope stability is greater than that of rainfall form.
【作者單位】： 中國地質(zhì)科學(xué)院地質(zhì)力學(xué)研究所;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(成都理工大學(xué));中國地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院;
【基金】：國家自然科學(xué)基金項目(41472296) 中國地質(zhì)調(diào)查項目(DD20160271)資助
【分類號】：P642.22

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