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Title: Monitoring and modelling of microseismicity associated with rock burst and gas outburst hazards in coal mines
Author: Cao, Wenzhuo
ISNI:       0000 0004 7963 8137
Awarding Body: Imperial College London
Current Institution: Imperial College London
Date of Award: 2019
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This thesis aimed at establishing a better understanding of the mechanisms involved and methods for forecasting, prevention and control of rock bursts and gas outbursts in underground coal mining. After a comprehensive review of relevant literature, the thesis first presents experimental investigations into the seismic response of coal blocks to stress and fracturing under true-triaxial stress conditions. The dynamic response of coal seams to longwall face advance has been investigated through continuous microseismic monitoring of several longwall panels over the research period. A conceptual model has been developed to interpret the recorded microseismicity based on the fracture slip seismicity-generation mechanism. Based upon the monitoring results and the conceptual model, a statistical short-term forecasting methodology was developed to estimate the probability of hazardous microseismicity during longwall coal mining. In addition, a discrete fracture network (DFN) based microseismic modelling methodology was developed to simulate Longwall Top Coal Caving (LTCC) mining induced microseismicity in a probabilistic framework through the combination of deterministic stress and failure analysis and stochastic fracture slip evaluation. The modelling methodology was further employed to investigate the impact of lithological heterogeneity on microseismic characteristics. Further on, rock bursts and coal and gas outbursts are generalised as problems of dynamic instability under excavation unloading conditions. The role of excavation unloading as a source of dynamic stress perturbations in contributing to rock bursts was quantified. A coal and gas outburst model based on fracture mechanics and gas dynamics was formulated and further numerically implemented to simulate coal and gas outbursts during roadway developments. Key factors affecting outburst initiation and its temporal evolution were also identified.
Supervisor: Durucan, Sevket ; Shi, Ji-Quan Sponsor: Engineering and Physical Sciences Research Council (EPSRC)
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral