【摘要】：為有效減少涇陽地區(qū)大面積灌溉活動誘發(fā)黃土滑坡對社會和經(jīng)濟(jì)帶來的巨大損失,開展灌溉型滑坡室內(nèi)實(shí)驗(yàn)研究,研究坡度在灌溉條件下對黃土滑坡變形破壞過程影響,具有重大的現(xiàn)實(shí)意義。本次實(shí)驗(yàn)設(shè)計(jì)了可用于坡頂和坡面的灌溉裝置,同時(shí)進(jìn)行了45°斜坡和60°斜坡的兩組室內(nèi)灌溉模型實(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三種傳感器記錄其內(nèi)部變化。通過對兩組實(shí)驗(yàn)過程及結(jié)果進(jìn)行對比分析,進(jìn)而得出灌溉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)結(jié)果表明,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),坡度越大,滑坡越易發(fā)生,滑面深度和滑動距離越小。
[Abstract]:In order to effectively reduce the social and economic losses caused by large area irrigation activities in Jingyang area, the laboratory experiment of irrigated landslide was carried out to study the influence of slope on the deformation and failure process of loess landslide under irrigation conditions. It is of great practical significance. In this experiment, an irrigation device was designed for the top and surface of a slope. Two groups of indoor irrigation model experiments were carried out on 45 擄and 60 擄slopes at the same time, and the volume water content sensor was embedded in each group of slopes. Three kinds of sensors, matrix suction sensor and pore water pressure sensor, record their internal changes. Through the comparison and analysis of the two groups of experimental processes and results, the deformation and failure law of shallow loess landslide under irrigation condition is obtained, and the failure mode and induced mechanism of this kind of landslide are summarized. The experimental results show that in the early stage of the experiment, with the increasing of the volume moisture content, the suction of the matrix gradually decreases to the basic stability, and the strength of the soil decreases, and the upper part of the soil is saturated at the later stage of the experiment. The deformation caused by the slope and the poor drainage of the soil resulted in the excess pore water pressure and the decrease of the effective stress and the minimum of the soil strength, which led to the occurrence of the landslide. At the same time, the larger the slope, the easier the landslide is, and the smaller the depth and distance of sliding surface.
【作者單位】： 中國地質(zhì)科學(xué)院地質(zhì)力學(xué)研究所;國土資源部新構(gòu)造運(yùn)動與地質(zhì)災(zāi)害重點(diǎn)實(shí)驗(yàn)室;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;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(41472296,41672282) 中國地質(zhì)調(diào)查項(xiàng)目(DD20160271)
【分類號】：P642.22

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 關(guān)惠平,孫易;甘肅黃土滑坡區(qū)域性時(shí)空特性分析(英文)[J];蘭州鐵道學(xué)院學(xué)報(bào);2001年01期

2 劉悅,黃強(qiáng)兵;一種黃土滑坡滑距預(yù)測模型[J];災(zāi)害學(xué);2001年03期

3 王念秦,張世武,王紅兵;黃土滑坡勘察設(shè)計(jì)模式研究[J];中國地質(zhì)災(zāi)害與防治學(xué)報(bào);2002年02期

4 李保雄;黃土滑坡臨滑預(yù)報(bào)的應(yīng)變控制方法[J];中國地質(zhì)災(zāi)害與防治學(xué)報(bào);2003年02期

5 張鴻義,黃洪標(biāo),閆中學(xué);新疆新源山區(qū)黃土滑坡形成條件與防治措施[J];新疆地質(zhì);2004年03期

6 槐東升;吳江林;楊鵬;;對陜北典型的黃土滑坡工程勘察的探討[J];科技風(fēng);2009年09期

7 楊U，

本文編號：2258884