【作者】 张和；

【导师】 毛彦龙；

【作者基本信息】 长安大学 ， 地质工程， 2008， 硕士

【摘要】 研究区位于陕西省华县金堆镇,由于露天矿开挖的不断进行,形成了一种由下部开挖形成的岩质边坡和上部人工堆渣组合的特殊的复合型边坡。目前北部堆积松散层已经发生了大范围的变形,在坡顶形成了一系列的张拉裂缝,局部产生了滑塌和破坏。而这种边坡的稳定性在很大程度上受生产爆破及靠帮爆破的影响,因此这种边坡处于爆破环境下,其动力效应到底如何?对于此类问题的研究是具有十分重要的现实和参考意义。本文通过研究金堆城露天矿的复合高边坡的动力响应,首先介绍了研究区的工程地质条件,然后分析了复合高边坡稳定性的影响因素和破坏形式,最后,利用爆破震动测试结果和有限元软件MSC.Marc进行数值模拟分析。考虑不同工况,本文模拟了三种工况下边坡的动力响应。通过有限元软件模拟计算,得到了复合型边坡的动力反应规律如下:(1)坡体的震动效应受震动波的周期影响较大,当震动波的周期接近或等于坡体自身的卓越周期时,坡体震动效应最明显。据此,也能够近似算出坡体不同工况下的卓越周期。震动持续时间对于动力放大效应无明显的影响。(2)同一种材料中,沿坡面向内同高程下,加速度放大效应依次减弱。而沿坡面向上,随高程的增大,加速度放大倍数逐渐增大。(3)在人工堆渣与破碎岩体接触带上,加速度的放大效应要明显高于两侧点的加速度放大效应。说明在两种材料耦合作用下,对震动的动力响应非常明显。(4)开挖深度130m时,随着上部荷载的增加,边坡的动力响应随之明显。更多还原

【Abstract】 The investigation region is located in Shaanxi Province Hua County Jindui town.As the opencast is durative, a compound rock slope is formed in there.The slope has the manpower castoff in upper part and the rock side slope in the lower part.At present the north part of slope has the big range deformation,and in the top of the slope having varying collapse、rupture and erode. The stability of the slope is influenced to a great extent by the blasting against slope.If the slope is under the blasting vibration situation, how the dynamic response are? It is of great signification and reference value to research such similar problems.At first, this article introduce the geological condition by search the dynamic response of the Jindui opencast. Then the in-depth research of the influence factor about the stability and the failure mechanism of the compound slope is made on this basis. Finally, the numerical simulation analysis is carried out based on the result of blasting vibration test and the finite element method software-MSC.Marc. Considering there are different loadcases, this article simulated the dynamic responses under three loadcases. By using the finite method software to simulate and calculate, the dynamic response orderliness of the compound slope are as follows:(1)The vibration effects of the slope are influenced badly by the period of the blasting seismic waves. If the period of the blasting seismic are closely to the natural period of the slope, the vibration effects of the slope are obviously. The natural periods of slopes under different loadcases canbe caculated roughly. The sustained time of the vibration has no obvious effect to the vibration effect.(2)The magnified effect of the acceleration should be weak when along the same altitude in the same material. The acceleration can be magnified more as the altitude increased.(3)The magnified effect of acceleration in contact areas of the castoff and the rock is bigger than that in either materials. It also reflects that the dynamic response is obvious by the coupling of two materials. (4)The dynamic response become obviously as the top loads of the slope increased.更多还原