爆破振动作用下饱水岩屑夹泥型结构面强度劣化规律

The weak structural plane is an important factor to control the stability of the rock mass in the slope. In the rainy season and the snow-melt period in the spring, the stability of the slope contain weak structural plane is vulnerable to the disturbance of blasting vibration. This project is aimed at rock slope controlled by weak structural plane under the influence of blasting vibration, and the common detritus-mud-type weak structural plane in rock slopes is selected as the study object. Firstly, the shear strength properties and the characteristics of the filling composition of the weak structural plane under saturated water conditions will be studied. Combining with numerical simulation and blasting vibration test, the static load and blasting dynamic load characteristics of the weak structural plane of the saturated state slope will be analyzed. Then, by simulating the blasting vibration load of the indoor vibration table, the shear strength deterioration of the saturated weak structure plane under different single strength and repeated blasting vibration loads will be studied. Combined with the theoretical analysis, the theoretical model for the shear strength deterioration of the weak structural plane under the blast vibration load will be established. Finally, based on studying the numerical calculation method of dynamic stability of rock slope under blasting vibration, the stability prediction of rock slope controlled by saturated weak structure plane under blasting vibration will be realized. The research results have important theoretical significance for enriching the methods of slope stability prediction and evaluation, and have important practical significance for guiding the development of slope engineering geological disaster prevention and blasting safety control technologies.

软弱结构面是控制边坡岩体稳定性的重要因素，雨季及春季融雪期边坡饱水状态软弱结构面在爆破振动扰动作用下极易发生滑移失稳。本项目针对爆破振动影响下受软弱结构面控制的岩质边坡工程，以岩质边坡中常见的岩屑夹泥型软弱结构面为研究对象，分析饱水状态下软弱结构面(剪切)强度特性及充填物组成特征；结合数值模拟计算及爆破振动测试，研究饱水状态边坡软弱结构面静力荷载及爆破动力荷载特征；通过室内振动台模拟爆破振动荷载，研究单次不同强度及反复多次爆破振动荷载作用下饱水软弱结构面(剪切)强度劣化规律；结合理论分析，建立爆破振动荷载作用下软弱结构面(剪切)强度劣化理论模型，研究爆破振动作用下岩质边坡动力稳定性数值计算方法，实现爆破振动作用下受饱水软弱结构面控制的岩质边坡稳定性预测。研究成果对于丰富边坡稳定性预测和评价方法具有重要的理论意义，对于指导边坡工程地质灾害的预防及爆破安全控制等技术的发展具有重要的实际意义。

软弱结构面是控制边坡岩体稳定性的重要因素，雨季及春季融雪期边坡饱水状态软弱结构面在爆破振动扰动作用下极易发生滑移失稳。本项目针对爆破振动影响下受软弱结构面控制的岩质边坡工程，以岩质边坡中常见软弱结构面为研究对象，分析饱水状态下软弱结构面(剪切)强度特性及充填物组成特征；结合数值模拟计算及爆破振动测试，研究饱水状态边坡软弱结构面静力荷载及爆破动力荷载特征；考虑实际工程中边坡软弱结构面所受动-静荷载耦合作用的影响，自主开发改装研制了爆破振动荷载作用后无扰动剪切试验仪；基于典型岩质边坡爆破振动荷载特征试验模拟，研究单次不同强度及反复多次爆破振动荷载作用下饱水软弱结构面(剪切)强度劣化规律；结合理论分析，建立爆破振动荷载作用下软弱结构面(剪切)强度劣化理论模型，实现爆破振动作用下受饱水软弱结构面控制的岩质边坡稳定性预测。.研究结果表明：①为准确预测受软弱结构面控制的岩质边坡爆破振动安全稳定性，需对边坡主控软弱结构面类型（岩块岩屑型、岩屑夹泥型、泥夹岩屑型、泥型）予以准确界定及评价；②当爆破振动超过某一强度时，存在一次“附加动荷载”作用造成边坡岩体动力失稳现象，此时爆破扰动产生的惯性力作用使得软弱结构面强度失效或强烈退化的同时导致边坡岩体抗滑力小于下滑力，进而诱发边坡岩体动力失稳；③当爆破振动荷载小于某一强度时，则存在反复爆破振动“弱化”作用造成边坡岩体动力失稳现象，此种情况下爆破振动荷载的反复作用下会导致结构面抗剪强度参数不断降低，从而导致边坡岩体累积损伤渐近破坏，此现象是当前矿山控制爆破工程中边坡失稳的主要表征形式。.本项目相关研究成果提出了爆破振动作用下受饱水软弱结构面控制的岩质边坡稳定性试验预测方法，揭示了雨水影响下受软弱结构面控制边坡工程爆破振动作用失稳机理，对于解决边坡爆破工程安全生产问题，指导边坡工程地质灾害的预防及爆破安全控制等技术的发展具有重要的实际意义和工程应用价值。