本文選題：斷續(xù)節(jié)理 + 連通率��； 參考：《工程地質(zhì)學(xué)報(bào)》2017年02期

【摘要】：在邊坡穩(wěn)定性評價(jià)中,不同形態(tài)、連通率及排列方式的巖橋起決定性作用。本文通過開展室內(nèi)直剪實(shí)驗(yàn)并結(jié)合聲發(fā)射特征參數(shù)的研究,揭示了不同連通率巖橋和不同法向應(yīng)力狀態(tài)下斷續(xù)節(jié)理巖體的破壞規(guī)律。結(jié)果表明:在直剪條件下,隨法向應(yīng)力及連通率的變化,巖體破壞面呈現(xiàn)"一"、"X"、"鋸齒"、"Z"以及復(fù)合型破壞,破壞面起伏度較小,且貫通破壞無時(shí)間先后性。法向壓力一定時(shí),隨著斷續(xù)巖橋連通率的提高,聲發(fā)射事件累計(jì)計(jì)數(shù)峰值呈線性增長,計(jì)數(shù)峰值不斷趨于增長。在巖橋連通率一定的情況下,隨法向應(yīng)力的增大,聲發(fā)射事件計(jì)數(shù)峰值與累計(jì)計(jì)數(shù)在中等法向應(yīng)力下最大。對斷續(xù)節(jié)理巖橋變形破壞特征的研究,有利于分析節(jié)理巖體的力學(xué)特性,有助于邊坡工程的穩(wěn)定性評價(jià)與預(yù)測。
[Abstract]:In slope stability evaluation, rock bridges with different shape, connectivity and arrangement play a decisive role. In this paper, the failure law of discontinuous jointed rock mass under different connectivity rock bridges and different normal stress states is revealed by means of indoor direct shear experiments and the study of acoustic emission characteristic parameters. The results show that under the direct shear condition, with the change of normal stress and connectivity, the failure plane of rock mass presents "one", "X", "sawtooth", "Z" and composite failure, the fluctuation of failure surface is relatively small, and there is no time sequence for through failure. When the normal pressure is constant, the accumulative peak value of acoustic emission events increases linearly with the increase of the connectivity ratio of intermittent rock bridges, and the peak value of the counting increases continuously. With the increase of normal stress, the peak and accumulative counting of acoustic emission events are maximum under the medium normal stress when the connectivity ratio of rock bridges is constant. The study of deformation and failure characteristics of intermittent jointed rock bridges is beneficial to the analysis of mechanical properties of jointed rock masses and to the evaluation and prediction of slope engineering stability.
【作者單位】： 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));
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973)項(xiàng)目(2013CB733202) 國家自然科學(xué)基金項(xiàng)目(41130745,41272330,41572283)資助
【分類號】：TU45

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