爆破对建筑物地基的振动效应研究与应用

发布时间：2018-01-20 20:51

本文关键词： 爆破振动速度经验公式建筑物地基数值模拟现场试验　出处：《重庆科技学院》2017年硕士论文　论文类型：学位论文

【摘要】：长期以来,在爆破施工过程中,爆破安全规程(GB6722-2014)中计算爆破作用下建筑物振动速度的萨道夫经验公式作为评判建筑物在爆破过程中影响程度的唯一标准,在实行工程应用当中我们发现,由于现在的一些精密仪器对地面振动速度的要求极高,而萨道夫经验公式作为计算建筑物振动速度的唯一手段在计算小药量远距离爆破时会出现一定的误差,这说明经验公式已经远远不能满足我们的要求。同时LS-DYNA作为一款近几年来兴起的模拟爆破的数值模拟软件,将数值模拟与经验公式结合起来应用于实际工程应用中的较少。因此,有必要将二者结合起来对爆破作用下建筑物振动响应的安全性进行研究。本文先是运用萨道夫斯基公式,对铜梁区汽车配套产业园的建筑物地基在爆破的作用下,其振动速度峰值进行了预测,通过LS-DYNA对建筑地基在爆破作用下的振动响应进行数值模拟,同时根据数值模拟的结果对萨道夫斯基公式进行修正。然后在巴南区某施工现场对爆破作用下的建筑物地基的振动速度峰值进行现场测试,分别测试了起爆药量为18kg、25kg、30kg的情况下,100米处的建筑物地基的振动速度,并且运用LS-DYNA对现场测试的三种情况进行数值模拟。最后再运用origin将经验公式、现场测试、数值模拟、修正经验公式四者计算结果进行比较。经过比较发现数值模拟与现场测试的重合度较高,数值模拟的结果要优于经验公式的结果。通过研究分析得出以下结论:(1)经验公式所计算爆破振动速度小于数值模拟和现场测试的结果。(2)LS-DYNA所计算的结果与实际的结果相近,因此可以将LS-DYNA多运用于工程实际当中,能更好的指导工程实际问题。(3)修正的经验公式线性回归显著,可靠性高,具有一定的应用价值。
[Abstract]:For a long time, in the process of blasting construction. The Sahdorf empirical formula for calculating the vibration velocity of buildings under blasting action is the sole criterion for evaluating the influence of buildings on the blasting process in blasting safety regulations (GB6722-2014). In the practice of engineering application, we found that some precision instruments now require very high ground vibration speed. However, as the only means to calculate the vibration velocity of buildings, there will be some errors in the calculation of the long distance blasting of small charge. This shows that the empirical formula can not meet our requirements, and LS-DYNA as a numerical simulation software developed in recent years to simulate blasting. The combination of numerical simulation and empirical formula is seldom used in practical engineering applications. It is necessary to combine the two to study the safety of building vibration response under blasting. The peak vibration velocity of the building foundation of the automobile industry park in Tongliang area is predicted by blasting, and the vibration response of the building foundation under blasting is simulated numerically by LS-DYNA. At the same time, based on the results of numerical simulation, the Saadolski formula is modified. Then the peak vibration velocity of the building foundation under blasting action is measured in a construction site in Banan. The vibration velocities of the building foundation at 100 meters were measured under the condition that the initial charge was 18 kg / 25 kg / kg and 30 kg / kg respectively. And use LS-DYNA to carry on the numerical simulation to the three kinds of situation of the field test. Finally, use the origin to carry on the empirical formula, the field test, the numerical simulation. The results of the four modified empirical formulas are compared. It is found that the coincidence between the numerical simulation and the field test is high. The result of numerical simulation is better than that of empirical formula. The following conclusion is drawn from the research and analysis: the velocity of blasting vibration calculated by empirical formula is less than that of numerical simulation and field test. The results calculated by LS-DYNA are similar to the actual results. Therefore, LS-DYNA can be applied to engineering practice, which can better guide the revised empirical formula. The linear regression is significant, the reliability is high, and it has certain application value.
【学位授予单位】：重庆科技学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU311.3

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