论文部分内容阅读
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。
According to the correlation between the developmental rules of rockfill fractures and the structure and movement characteristics of rockfill, a new method for predicting the height of rockfill fractures based on the composite structures of strata and rock strata was proposed. It is found that the water-bearing fractured rock strata should develop upwardly in a stepwise manner in the strata group. Each strata group consists of a hard rock layer and an upper soft rock layer with high strength in the lower part. By theoretical analysis, Elongation as a criterion to determine the deformation of the rock formation and the extent of fracture development, as long as the determination of the lower hard rock strata of the rock inflection point of inflection point can be more accurate analysis of the rock group fracture development, and thus accurate Predict the developmental height of water-bearing fracture zone. Based on the consideration of the collapse and collapse characteristics of overlying strata, a more reasonable calculation formula of strata stretch rate is derived. After field test, the predicted high value predicted by this method is in good agreement with the field measurements.