覆岩组合结构下导水裂隙带演化规律与发育高度分析

发布时间：2018-04-27 15:49

本文选题：导水裂隙带 + 覆岩运动　；参考：《采矿与安全工程学报》2017年02期

【摘要】：根据导水裂隙带发育规律与岩层结构及其运动特征的相关性,提出了基于覆岩组合结构与岩层拉伸变形计算的导水裂隙带高度预计新方法。研究发现覆岩导水裂隙带应是以岩层组为单位呈阶梯状向上发育的,每个岩层组由下部强度因素高的坚硬岩层与上部软弱岩层组成;通过理论分析,提出以岩层层向拉伸率为判据来判断岩层组的下沉变形及裂隙发育程度,只要确定各岩层组中的下位坚硬岩层的拉伸率变化拐点就可以较为准确地分析该岩层组的裂隙发育度,从而准确预测导水裂隙带发育高度。在考虑覆岩垮落碎胀特性的基础上,推导得到了较为合理的岩层层向拉伸率计算公式。经过现场实测验证,该方法理论预计的导高值与现场实测结果非常吻合。
[Abstract]:A new method for predicting the height of water-conducting fissure zone based on overburden combined structure and tensile deformation calculation is proposed according to the correlation between the development law of water-conducting fissure zone and strata structure and movement characteristics. It is found that the overburden water conductivity fissure zone should be developed upward in the form of step by step, each rock group is composed of hard rock with high strength factor in the lower part and weak rock layer in the upper part. It is put forward that the subsidence deformation and fracture development degree of rock formation can be judged by the criterion of rock stratum tensile ratio. If the inflection point of tensile rate change of the lower hard rock in each formation is determined, the fracture development degree of the rock formation can be analyzed more accurately. Thus the development height of the water-conducting fissure zone is accurately predicted. On the basis of considering the characteristics of collapse and dilatancy of overburden rock, a reasonable formula for calculating the tensile rate of strata is derived. The experimental results show that the predicted conductance height of the method is in good agreement with the field measurements.
【作者单位】：山东科技大学矿业与安全工程学院;中国矿业大学(北京)力学与建筑工程学院;华北科技学院安全工程学院;
【基金】：国家自然科学基金项目(51304127,51404105)
【分类号】：TD31

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