摘要
为了确定煤层高强度开采引起的非连续变形对地面建(构)筑物的破坏程度,对开采引起的地表土体裂缝极限发育深度进行了探讨。首先分析了天然土体内的三向应力状态,结合开采沉陷对土体内应力变化的扰动规律,得到了开采引起的土体中应力分布规律和裂缝发育扩展的原因。结合统一强度理论,提出了理论上较为完备的开采引起的土体裂缝极限发育深度计算方法。与现场实际开挖裂缝深度的比较结果表明,该方法的计算结果具有较高的可信度。
In order to determine the non-continuous deformation occurred by the high intensive mining in seam to the failure degree of the buildings at the surface ground,the paper had a discussion on the limit development depth of the cracks in the surface ground occurred by the coal mining.The paper first analyzed the three dimensional stress status in the natural soil mass.In combination with the turbulent law of the mining subsidence to the stress variation in the soil mass,the stress distribution law and the crack development expansion cause in the soil mass occurred by the mining was obtained.In combination with the unified strength theory,the paper provided the calculation method for the limit development depth of the soil mass cracks occurred with the well improved mining in theory.In comparison with the site actual excavated crack depth,the results showed that the calculation results of the method would have a higher confident.
出处
《煤炭科学技术》
CAS
北大核心
2010年第6期108-111,103,共5页
Coal Science and Technology
基金
江苏省高校"青蓝工程"资助项目(苏教师(2008)30号)
关键词
开采沉陷
应力分布
土体裂缝
极限深度
mining subsidence
stress distribution
cracks in soil mass
limit depth
