Research and application of stress (pressure) measurement system for physical modeling

A low-disturbance, high-precision, and high-efficiency measuring system has been developed for a newly-built physical modeling system, and its three component modules have been developed and calibrated on basis of instrumentation data.The calibration results show that the abutment pressure test modulus has stable output.The roof support modeling module is of high linearity, reliability and stable mechanical property.The stress test bricks have good consistency with modeling materials in the aspect of mechanical properties, compatibility of deformation, and its characteristics of moisture-proof and insulation can meet moist model-making condition.The application results indicate that the whole measurement system can provide high precision testing data, efficient sampling works and long-term reliability.The application of this measuring system along with physical modeling system can achieve the evolution of mining-induced stress field and roof weighting prediction, and an enhanced understanding of the interaction between roofs and supports.The key findings could demonstrate the relevance between mining-induced stress and overbying strata breaking.