金堆城排废场人工填土高边坡动力稳定性研究

【作者】 刘寒鹏；

【导师】 毛彦龙； 胡高社；

【作者基本信息】 长安大学 ， 地质工程， 2003， 硕士

【摘要】 本文主要从以下几个方面对金堆城排废场人工堆积松散高边坡进行动力稳定性研究： (一)利用有限元模拟结果，结合野外工程地质调绘，得到研究区人工堆积高边坡在自然条件下，有如下几种变形及破坏类型：整体破坏(a)——蠕滑～拉裂型、整体破坏(b)——拉裂～滑移型、表部破坏(a)——细沟、冲沟型、表部破坏(b)——滑塌型。 (二)采用频谱分析方法研究了爆破产生的地震波在介质中传播的特性和基本规律，拟合出了指导工程设计与研究的地震波振速衰减经验公式。 (三)采用模态叠加法针对爆破动力作用，进行边坡的动力响应分析，得出了以下结论： (1)振动频率为0.3Hz时，坡面顶部水平向加速度峰值最大；综合考虑，可认为该边坡的自振频率为0.3Hz左右； (2)地形对爆破地振动存在放大作用，研究剖面的坡面，水平向加速度及位移在地形相对高差45米左右最大，而后随相对高差的增高而减小，相对高差为100米时，水平向位移及加速度绝对值均大于坡脚； (3)强迫振动段，水平向加速度值随时间变化的规律为：坡顶节点总的变化趋势是越来越大，而坡体中部节点的变化趋势是越来越小； (4)当爆破振速较小时，变形破坏的形式表现为坡顶表面滑塌型。更多还原

【Abstract】 This paper primary research and achievements that concerned about the dynamic stability for Jindui city artificial filled relax high slope has been made as follow:(一) In the nature condition, utilizing Finite-element method and engineering geology technique, gained the type, mechanism, rule of the deformation and destruction of the slope as below: the type of unitary destroy; the shallow part destruction.(二) Using spectrum analysis investigate the transport character and primary rule of explosion wave in the medium, simulate the formula of attenuation for explosion wave, which will be used to guide the design of the engineering.(三) Under the dynamic load of the explosion, the numeric analysis has been done and achieve the rule as follow:(1) When the frequency of vibration is 0.3Hz, the acceleration of the slopes top gets the maximum; so 0.3Hz is believed the natural frequency of the slope as a whole;(2) The vibration of explosion can been magnified because of the condition of the landform, when the relative altitude is up to 45m, the acceleration of horizon gets the maximum; when the relative altitude is up to 100m, the absolute value of acceleration and the deformation of horizon is larger than that in the bottom of the slope;(3) In the period of forced vibration, at the top of the slope, the acceleration of horizon become larger and larger; at the middle part of the slope ,it becomes smaller;(4)When the explosion velocity of is much little, the shallow part destruction is the primary deformation of the slope .更多还原