本文關(guān)鍵詞： 黃土斜坡 降雨 滑坡 物理模型實(shí)驗(yàn) 孔隙水壓力　出處：《工程地質(zhì)學(xué)報(bào)》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(jì)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(jì)的影響,開展降雨型滑坡室內(nèi)實(shí)驗(yàn)研究,具有重大的現(xiàn)實(shí)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(jì)并進(jìn)行了3組室內(nèi)物理模型實(shí)驗(yàn),分別為持續(xù)強(qiáng)降雨斜坡實(shí)驗(yàn)、持續(xù)強(qiáng)降雨斜坡(帶垂直節(jié)理)實(shí)驗(yàn)和間歇性強(qiáng)降雨斜坡實(shí)驗(yàn),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(gè)黃土斜坡體內(nèi)傳感器的讀數(shù)變化及實(shí)驗(yàn)現(xiàn)象進(jìn)行分析,同時(shí)對不同實(shí)驗(yàn)條件下實(shí)驗(yàn)過程及結(jié)果進(jìn)行對比,進(jìn)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(jī)理。實(shí)驗(yàn)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(qiáng)度隨之減小,實(shí)驗(yàn)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(qiáng)度減小至最小,導(dǎo)致滑坡產(chǎn)生。同時(shí),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(hù)國家重點(diǎn)實(shí)驗(yàn)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(xiàng)目(41472296) 中國地質(zhì)調(diào)查項(xiàng)目(DD20160271)資助
【分類號】：P642.22

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