爆破振动在边坡上的传播规律及对边坡稳定性的影响

发布时间：2019-01-03 11:37

【摘要】：爆破振动对边坡稳定性影响一直是各国学者研究的热点问题。爆破振动会大大降低边坡的稳定性,而边坡稳定与否直接影响到工作现场的正常生产、设备人员的安全及企业的经济效益。因此研究爆破振动在边坡上的传播规律,更好地认识爆破振动对边坡稳定性的影响具有重要意义。本文采用物理模拟试验与现场试验相结合的方式,研究了不同类型边坡的振动速度传播规律,并根据现场实测数据,对边坡进行了静力和动力状态下的稳定性分析。论文的主要研究结果如下:(1)爆破振动在边坡上的传播规律。通过台阶形边坡与直面形边坡爆破振动测试模拟试验,结果表明:同一平台上,爆破振动速度是由台阶边缘向台阶根部递减的,同时振速的衰减速率也是由台阶边缘向根部递减的;在同一台阶坡面的坡顶和坡底,坡顶的振速相对于坡底的振速会出现增大或衰减减缓的现象;直面形边坡振速的衰减较为平缓。(2)爆破振动速度预测。对台阶形边坡进行爆破振动速度预测时,只对台阶根部测点的振速进行预测时,预测精度最高;对台阶根部和中间测点爆破振速进行预测时,预测精度稍差;对全部测点进行爆破振速预测时,由于台阶边缘爆破振动速度会出现突然增大现象,导致预测精度最低。(3)爆破振动放大效应研究。台阶形边坡的振速放大系数随着台阶坡面角及最终边坡角的增加而增加,直面形边坡在顶部边缘会出现爆破振动速度放大现象。(4)边坡的稳定性分析。对绵阳市科技城大道工业园1号路路堑边坡的稳定性分析结果表明:在静力和爆破动力状态下边坡都是稳定的,但稳定性系数随着边坡级数的增加而降低;爆破振动作用下边坡稳定性系数较静力作用下平均降低5.95%;在爆破振动作用下边坡的稳定性损失系数有随着边坡级数增加而增加的趋势。
[Abstract]:The influence of blasting vibration on slope stability has been a hot topic for scholars all over the world. Blasting vibration will greatly reduce the stability of the slope, and the slope stability will directly affect the normal production of the work site, the safety of equipment personnel and the economic benefits of the enterprise. Therefore, it is of great significance to study the propagation law of blasting vibration on slope and better understand the influence of blasting vibration on slope stability. In this paper, the laws of vibration velocity propagation of different types of slopes are studied by combining physical simulation test with field test, and the stability of slope under static and dynamic conditions is analyzed according to the field measured data. The main results are as follows: (1) the propagation law of blasting vibration on slope. Through the blasting vibration test simulation test of the step slope and the straight side slope, the results show that the blasting vibration velocity decreases from the edge of the step to the root of the step on the same platform. At the same time, the attenuation rate of the vibration velocity decreases from the edge of the step to the root. At the top and bottom of the slope on the same step, the vibration velocity of the top of the slope will increase or decrease slowly relative to the velocity of the bottom of the slope, the attenuation of the vibration velocity of the straight side slope is relatively gentle. (2) the prediction of blasting vibration velocity. When predicting the blasting vibration velocity of the step slope, the prediction accuracy is the highest only when the vibration velocity of the step root measuring point is predicted, and the prediction accuracy is slightly poor when the blasting vibration velocity of the step root and the intermediate measuring point is forecasted. When the blasting vibration velocity is predicted for all the measured points, the prediction accuracy is the lowest due to the sudden increase of the blasting vibration velocity at the edge of the step. (3) study on the amplification effect of blasting vibration. The magnification factor of the vibration velocity of the step slope increases with the increase of the angle of the step slope and the final slope angle, and the blasting vibration velocity amplification phenomenon occurs at the top edge of the straight side slope. (4) the stability analysis of the slope. The stability analysis of the cutting slope of No.1 Road of the Industrial Park of Science and Technology City in Mianyang City shows that the slope is stable under both static and blasting conditions, but the coefficient of stability decreases with the increase of slope series. The slope stability coefficient under blasting vibration is 5.95% lower than that under static action, and the slope stability loss coefficient increases with the increase of slope progression under blasting vibration.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD804;TD235

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