地形条件对大安山井田地应力的影响

In-situ stress under landform influence in Daanshan mining area

针对大安山井田复杂的地质条件,采用理论分析、数值模拟和现场实测手段,研究了地形条件对大安山井田地应力的影响。通过理论分析探讨了地形条件对井田地应力的影响规律,结合实测结果与数值计算结果验证了理论分析的有效性。所建立的理论分析模型及分析方法经进一步改进后,完全可以应用于地形条件对井田地应力的影响规律分析。在浅部地层,地形条件对井田地应力场的影响较大。随采深的增加,这种影响逐渐减弱。深部地层应力场主要由自重应力和构造应力组成。地形条件是影响井田地应力场分布特征的重要因素。在采区设计阶段,就应该首先查明井田地形条件,详细分析地形条件对地应力的影响,充分考虑因地形因素造成的应力集中区域。

In terms of complex geological conditions in Daanshan Mine,this study investigates the in-situ stress under surface landform influence using theoretical analysis,numerical calculation and site measurement.Based on the theoretical analysis on the characteristics of in-situ stress under landform conditions influence,the cross validation on the feasibility of the analytical model using numerical calculation and site measurement,an analytical model and method has been developed and improved.The analytical model and method can be used to analyze the in-situ stress under landform conditions influence.The landform conditions have significant impact on in-situ stress at shallow layers.However,this influence gradually reduces with the increase of mine depth.In deep strata,the in-situ stress depends on rock gravity and structural stress.The landform is an important factor affecting in-situ stress distribution.At the design stage of a mining area,the landform conditions must be investigated to understand their effect on in-situ stress.In particular,the stress concentration area caused by landform conditions must be carefully considered.