煤岩结构体多级应力控制防冲实践及动态调控

通过对煤岩结构体受力状态的理论分析并结合现场实践,提出了从区域应力协调到局部应力控制的煤岩结构体多级应力控制防冲技术理论。针对深部采场应力多变和冲击危险影响因素多样,建立以煤岩结构体应力/强度比及冲击危险多参量组合评价的应力控制动态调控技术。研究发现,煤岩结构体的冲击失稳孕育过程与组合煤岩试件的受力失稳过程基本相同,以煤岩结构体稳定性为基础,应力控制为中心的多级应力控制技术可有效控制冲击地压,在强冲击危险工作面切眼对掘期间,根据多参量监测评价系统及现场防冲实时反馈信息动态调整局部应力控制技术及相关卸压参数,实现了切眼的顺利贯通。

Dynamical Control and Multi-Field Stress Control of Rock Burst Prevention for Coal-Rock Structure

The stress state of coal-rock structure in different phase during mining was analyzed and the theory of multi-field stress control was advanced from the regional stress coordination to local stress control. Owing to the changeful mining pressure in long wall face and various influencing factors in deep field, the dynamic regulating technology of coal-rock structure was found based on combined estimation of stress/strength ratio and multi-parameters. It’s found that the evolution process of coal-rock structure instability is about the same as the instability of the combined sample of coal and rock and the technology of multi-field stress control can prevent the rock burst. During the driving forward with cutting hole at high dangerous rock burst area, the multi-parameters estimation system was used, the technology of stress control and the pressure relief parameters were controlled dynamically based on the real-time feedback information from rock burst prevention field, the transfixion of cutting hole was safely realized.