In this paper, a new safety control method of the jointed slope under blasting excavation is presented. The spatial distribution of blasting damage and time-history characteristic of dynamic stability around the joint were investigated carefully based on the secondary development of the explicit FE code, LS-DYNA. Results clearly indicated that the evolution law of damage and stability are opposite with the change of joint angle, and the dual-controlled mechanism of damage extension and stability fluctuation exists in the safety control of the high rock slope with joints. Then a new safety control method is proposed by implementing the equivalent Blasting Safety Control Standard (BSCS) which includes coupled effects of damage and stability. Results reveal that a critical joint angle exists, and if the inclination is larger than the threshold value, the BSCS depends on damage extension, otherwise it was determined by stability fluctuation. Finally, site experiments are implemented carefully based on the blasting excavation of the famous Baihetan high rock slope with columnar joint in China to verify the rationality of the new control approach. Sonic wave test, displacement measurement and blasting vibration test are implemented for nearly two years to track the evolution process of damage and stability of the jointed slope. Experimental results demonstrate that the new approach could improve the accuracy rate of control by 40%.

中文翻译：

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带节理的高岩边坡爆破开挖安全控制新方法

本文提出了一种新的爆破开挖接缝边坡安全控制方法。基于显式有限元代码LS-DYNA的二次开发，仔细研究了爆破损伤的空间分布和接头周围动力稳定性的时程特性。结果清楚地表明，损伤与稳定的演化规律与节理角度的变化相反，在具有节理的高岩边坡安全控制中存在损伤扩展和稳定性波动的双重控制机制。然后通过实施等效的爆破安全控制标准（BSCS），提出了一种新的安全控制方法，该标准包括破坏和稳定性的耦合效应。结果表明存在临界关节角度，如果倾角大于阈值，BSCS 取决于损伤扩展，否则由稳定性波动决定。最后，结合国内著名的柱状节理白鹤滩高岩边坡的爆破开挖，认真进行现场试验，验证了新控制方法的合理性。通过近两年的声波试验、位移测量和爆破振动试验，跟踪节理边坡的破坏和稳定性演化过程。实验结果表明，新方法可以将控制准确率提高40%。以国内著名的柱状节理白鹤滩高岩边坡爆破开挖为例，认真进行现场试验，验证了新控制方法的合理性。通过近两年的声波试验、位移测量和爆破振动试验，跟踪节理边坡的破坏和稳定性演化过程。实验结果表明，新方法可以将控制准确率提高40%。以国内著名的柱状节理白鹤滩高岩边坡爆破开挖为例，认真进行现场试验，验证了新控制方法的合理性。通过近两年的声波试验、位移测量和爆破振动试验，跟踪节理边坡的破坏和稳定性演化过程。实验结果表明，新方法可以将控制准确率提高40%。