基于爆破累积损伤的边坡稳定性变化研究

doi:10.13722/j.cnki.jrme.2015.1192

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摘要爆破开挖所引起的邻近边坡岩体的扰动和损伤，特别是多次爆破产生的累积损伤效应，必然导致岩体力学参数弱化，是造成边坡破坏甚至失稳的重要影响因素。根据所建立的损伤模型，采用声波测试法，对边坡岩体在爆破荷载作用下的累积损伤效应进行了现场试验研究，并根据损伤研究的结果对边坡岩体抗剪强度参数进行折减；基于强度折减法和时程分析法，应用有限元软件ANSYS对爆破荷载作用下的边坡安全系数变化规律进行研究。研究结果表明：每次爆破震动的直接作用使边坡安全系数降低5.1%～12.6%，爆破累积损伤的作用使边坡的安全系数下降了35.2%，多次爆破条件下，爆破损伤对边坡安全系数的影响比爆破载荷本身的影响更大；地震波载荷作用下，随着边坡强度参数的折减，坡底节点水平最大位移也在不断增加，主要原因是由于边坡强度折减造成的塑性位移增加；爆破振动对软弱边坡稳定性的影响更加明显。

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	费鸿禄
	苑俊华

关键词 ：边坡工程, 爆破振动, 累积损伤, 强度折减法, 时程分析, 边坡安全系数

Abstract：The disturbance and damage of adjacent slope caused by blasting excavation，especially the accumulative damage caused by multiple blasting，will inevitably lead to the weakening of rock mechanics parameters，which is an important factor causing the failure of the slope. According to the damage model，the cumulative damage effect of rock slope under blasting load was studied by using the method of sonic wave test，which was used to reduce the shear strength parameters of the slope mass. Based on the strength reduction method and time history analysis method，the change law of slope safety factor under blasting load was studied by using finite element software ANSYS. The results show that the safety factor of the slope is reduced by 5.1%–12.6% under each blasting load，and the safety factor of the slope is decreased by 35.2% because of the cumulative damage，the effect of blasting damage on the safety factor of the slope is greater than that of the blasting load. With the reduction of slope strength parameters，the maximum displacement of the slope bottom node is also increasing under the loading of seismic wave，which is mainly because of the plastic displacement caused by the strength reduction of the slope. The influence of blasting vibration on weak slope is more obvious.

Key words： slope engineering blasting vibration cumulative damage strength reduction method time-history analysis safety factor of slope

引用本文:

费鸿禄，苑俊华. 基于爆破累积损伤的边坡稳定性变化研究[J]. 岩石力学与工程学报, 2016, 35(S2): 3868-3878.
FEI Honglu，YUAN Junhua. Study of slope stability based on blasting cumulative damage. , 2016, 35(S2): 3868-3878.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.1192 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS2/3868

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