A Study on Dual-Load-Zone Model of Overlying Strata andEvolution Law of Mining Stress

• 作者: Meng Li Mingpeng Li Xiaoding Xu Yuejin Zhou
• 来源期刊: 计算机、材料和连续体(英文)
• 学科: 地球科学
• 关键词: Overlying STRATA structure dual-load-zone MINING stress evolution LAW
• 年，卷（期）: 2019,（2）
• 页码范围: 391-407
• 页数: 17页
• 分类号: P61

摘要

The changeable structure and movement law of overlying strata are the maincontributor to the change of mining stress.Starting from the relevant theory of keystratum and particularly based on the theory of mine ground pressure and strata control,this research proposed a new solution to mining stress problems by establishing adual-load-zone stratum structural model.Elastic foundation beam theory was used tosolve the stress of overlying strata of the dual-load-zones with superposition method,which revised the traditional calculation method of mining stress.The abnormal increaseof lead abutment pressure in the mining area was explained effectively,through which theevolution law of mining stress in the case of hard rock was obtained.The results indicatethat mining stress experiences a drastic change within the range of 50 m ahead of the coalwall due to the collapse of main roof;under the influence of main key stratum andinferior key strata,the influence range of lead abutment pressure is extended up toapproximately 120 m in the working face;this remarkable increase can be attributed tothe excessive length of sagging zone.Results from both the dual-load-zone modelexperiment and field measurement demonstrate high consistency.The model can predictthe influence range of abutment pressure effectively and thus guide the safety productionof mining.