Abstract
The rockburst disaster in the hard rock caused by excavation and unloading of deep underground caverns threatens the safety of engineering construction. In recent years, the microseismic monitoring technology, which can dynamically monitor the whole process of progressive failure of rock mass in real time, has been widely used in rockburst monitoring and early warning of underground engineering. In view of the slight rockburst in local surrounding rock during the excavation of underground powerhouse of Huanggou Pumped Storage Power Station, a rockburst microseismic monitoring system is constructed. And through the analysis of the temporal and spatial activity of microseisms during the monitoring period, the potential risk areas of rockbursts are identified and delineated. The monitoring results show that the microseismic system can effectively capture the blasting and microseismic signals during construction. The microseismic activity is closely related to the intensity of field blasting disturbance. The potential risk areas of rockburst are the upstream side arch shoulder and the intersection between lower drainage corridor and workshop installation room. The research results can provide technical support for later excavation and support of underground powerhouse caverns of Huanggou Hydropower Station.
Highlights
Rockburst is a phenomenon of rockmass dynamic instability such as fracture, spalling, ejection, and even throwing, caused by sudden release of elastic strain energy stored therein due to excavation and load removal in underground projects in high ground stress circumstances
Rockburst often occurs in hard and brittle rock masses, and they are accompanied by different degrees of cracking noises [1,2,3,4]
Frequent rockburst disasters during the excavation of deep underground caverns directly threaten the safety of construction personnel and equipment and delay the construction progress, especially, in severe cases
Summary
Rockburst is a phenomenon of rockmass dynamic instability such as fracture, spalling, ejection, and even throwing, caused by sudden release of elastic strain energy stored therein due to excavation and load removal in underground projects in high ground stress circumstances. The microseismic monitoring system of underground powerhouse of the Huanggou Pumped Storage Hydropower Station is constructed, and based on the monitoring data of two months from the beginning, the microseismic activities induced by blasting excavation of powerhouse caverns are analyzed. In the initial stage of excavation of the underground powerhouse of the hydropower station, the surrounding rocks of various locations have experienced different degrees of slab and rockburst (see Figure 2). In order to understand the stability of the surrounding rock in the subsequent excavation process, the microseismic monitoring system is introduced to monitor the underground powerhouse in real time, so as to identify and delineate the potential instability hazard areas that affect the stability of the surrounding rock and provide guidance for safe construction
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