顺层岩质边坡爆破的振动控制及损伤特性

发布时间：2018-07-28 07:34

【摘要】：为了更好地了解顺层岩质边坡爆破开挖时振动速度的传播规律以及坡体的损伤程度,以云南省普宣高速公路顺层边坡爆破开挖为工程背景,利用声波测试结合监测点振动速度的方法,获取坡体不同深度的声速变化及不同位置的振动速度,分析不同药量下单次和多次爆破的坡体损伤范围以及振动速度的衰减规律。研究表明,爆破区任意点的振动速度与损伤深度存在对应关系:对单次爆破,振动速度与损伤深度呈线性关系,而对多次爆破,振动速度与损伤深度呈非线性关系;以声速降低率10%作为损伤界限,并作为爆破控制时,单次爆破对应的临界振动速度为11.54cm/s,损伤半径为5.57m;,基于首次爆破的多次爆破临界振动速度为24.20cm/s,最大损伤半径为7.56m,并由萨道夫基公式得到2种方式的最大起爆药量。
[Abstract]:In order to better understand the propagation law of vibration velocity and the damage degree of slope during blasting excavation of bedding rock slope, the blasting excavation of bedding slope of Puxuan Expressway in Yunnan Province is taken as the engineering background. By using the method of acoustic wave measurement and monitoring point vibration velocity, the variation of sound velocity at different depth and the vibration velocity at different positions are obtained, and the damage range and attenuation law of vibration velocity are analyzed. The results show that there is a linear relationship between vibration velocity and damage depth at any point in blasting area: for single blasting, vibration velocity has a linear relationship with damage depth, while for multiple blasting, vibration velocity has nonlinear relationship with damage depth. When the sound velocity reduction rate of 10% is taken as the damage limit, and when the sound velocity is controlled by blasting, The critical vibration velocity corresponding to single blasting is 11.54 cm / s, the damage radius is 5.57 mm, the critical vibration velocity of multiple blasting based on the first blasting is 24.20 cm / s, and the maximum damage radius is 7.56 m.
【作者单位】：武汉理工大学土木工程与建筑学院;云南省公路开发投资有限公司;云南交通职业技术学院建筑工程学院;
【基金】：国家自然科学基金项目(51374163) 云南省交通运输厅2010科技专项项目(云交科2010(A)07-a)
【分类号】：U416.14

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