柿庄北3号煤层古应力场数值模拟研究

Study on Numerical Simulation of paleo stress field in SHIZHUANGBEI third coal seam

古应力场的研究是煤层裂缝预测的基础,由于构造模拟是一种近似研究,目前还没有评价古应力场的有效途径。通过对柿庄北3号煤层地质构造的研究,首次采用组合优选应力法确定古应力大小,采用节点约束位移来提高古应力场数值模拟的精度。通过数值模拟得出3号煤层燕山期的应力场分布,主造缝期为燕山期,为该地区今后煤层气开发过程中煤层裂缝预测提供了理论依据。

The research of the ancient stress field is the foundation of the prediction of the coal seam fracture. Due to the tectonic simulation is an approximate study, there is no effective way to evaluate the ancient stress field. By researching the No. 3 coal seam geological in North Shi Zhuang, initial stress method to determine the size of the optimal combination of ancient stress, node displacement constraint is used to improve the accuracy of ancient stress field numerical simulation. By numerical simulation, the distribution of stress field in the Yanshan period of No. 3 coal seam is obtained, and the main fracture formation period is Yanshan period, which provides a theoretical basis for the prediction of coal seam fracture in the future.