地震與同震冰滑坡綜合作用下動(dòng)水壓力分布規(guī)律試驗(yàn)研究
本文選題:地震 + 冰湖潰決 ; 參考:《工程科學(xué)與技術(shù)》2017年06期
【摘要】:地震作用下常常引發(fā)大量的崩塌滑坡,但目前對(duì)冰湖潰決風(fēng)險(xiǎn)評(píng)估中,一直忽視了地震及同震觸發(fā)滑坡的綜合作用。為研究地震及同震觸發(fā)滑坡二者綜合作用下的動(dòng)水壓力分布規(guī)律,首先分別進(jìn)行地震和冰滑坡作用下的動(dòng)水壓力試驗(yàn)分析,然后設(shè)計(jì)了在振動(dòng)臺(tái)模擬地震過程中加入冰滑坡入水的試驗(yàn),觀察地震與冰滑坡綜合作用下動(dòng)水壓力的分布特點(diǎn)。結(jié)果表明:地震動(dòng)水壓力沿水深分布表現(xiàn)為上小下大的特點(diǎn),其結(jié)果與Westergaard簡(jiǎn)要解吻合良好;冰滑坡作用下動(dòng)水壓力沿水深服從上大下小的分布規(guī)律,并分析了滑塊體積、入水速度及初始水深等因素對(duì)最大動(dòng)水壓力值變化的影響,采用試驗(yàn)數(shù)據(jù)擬合得到冰滑坡入水動(dòng)水壓力值的經(jīng)驗(yàn)公式;地震和冰滑坡共同作用時(shí)動(dòng)水壓力分布曲線近似于兩者單獨(dú)作用下動(dòng)水壓力幅值的疊加,只是綜合值小于疊加值;提出地震與同震冰滑坡綜合作用下最大動(dòng)水壓力的估算方法。
[Abstract]:A large number of landslides are often caused by earthquake, but the comprehensive action of earthquake and coearthquake triggered landslide has been neglected in the risk assessment of glacial lake collapse. In order to study the distribution of dynamic water pressure under the combined action of earthquake and coearthquake triggered landslide, the dynamic water pressure under the action of earthquake and ice landslide is analyzed separately. Then the experiment of adding ice landslide into water during shaking table simulation is designed to observe the distribution characteristics of dynamic water pressure under the combined action of earthquake and ice landslide. The results show that the distribution of the water pressure along the depth of the ground motion is larger than that of the upper one, and the result is in good agreement with the Westergaard's brief solution, and the distribution law of the dynamic water pressure along the water depth under the action of the ice landslide is obtained, and the volume of the slider is analyzed. The influence of inlet velocity and initial water depth on the change of maximum dynamic water pressure is studied. The empirical formula of the dynamic pressure of ice landslide is obtained by fitting the test data. The distribution curve of dynamic water pressure under the interaction of earthquake and ice landslide is similar to that of the amplitude of dynamic water pressure under the action of both alone, but the comprehensive value is less than the superposition value, and the method of estimating the maximum dynamic pressure under the combined action of earthquake and ice landslide is put forward.
【作者單位】: 西南交通大學(xué)土木工程學(xué)院;高速鐵路線路工程教育部重點(diǎn)實(shí)驗(yàn)室;陸地交通地質(zhì)災(zāi)害防治技術(shù)國(guó)家工程實(shí)驗(yàn)室;
【基金】:國(guó)家自然科學(xué)基金資助項(xiàng)目(41571004) 國(guó)家重點(diǎn)研發(fā)計(jì)劃資助項(xiàng)目(2016YFC0802206) 中國(guó)鐵路總公司科技研究開發(fā)計(jì)劃課題資助項(xiàng)目(2015G002-N)
【分類號(hào)】:TV131.6
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