基于颗粒离散元的薄基岩裂隙扩展规律#

发布时间：2018-05-31 12:00

本文选题：颗粒离散元 + 突水溃沙　；参考：《煤炭学报》2017年02期

【摘要】：采动影响下的薄基岩产生导水裂隙通道,贯通厚风积沙层,容易产生突水溃沙灾害。为研究薄基岩导水裂隙通道发育规律,借助于颗粒离散元理论,建立考虑复杂应力作用的薄基岩模型,分析了原生裂隙长度、覆岩压力和水沙两相作用对裂隙在薄基岩平面横向发育规律的影响。研究发现颗粒离散元理论可以较好的揭示薄基岩的破坏机理;扩展裂隙在原生裂隙尖端呈"Y"和"X"型发育,且发育形态与薄基岩受到覆岩压力大小和原生裂隙长度有关。研究了不同原生裂隙长度、覆岩压力和水沙作用下裂隙扩展发育的4个阶段并给出了破坏曲线,分析了不同条件的改变对薄基岩裂隙扩展影响的定量关系。
[Abstract]:Under the influence of mining, the thin bedrock produces a channel of water conduction fissure and passes through the thick aeolian sand layer, which is easy to produce the disaster of water inrush and sand collapse. In order to study the development rule of water conduction fissure channel in thin bedrock, a thin bedrock model considering complex stress is established by means of particle discrete element theory, and the primary crack length is analyzed. The influence of overburden pressure and water-sediment two-phase interaction on the horizontal development of cracks in thin bedrock. It is found that the granular discrete element theory can better reveal the failure mechanism of thin bedrock, and the extended fracture develops in "Y" and "X" type at the tip of primary fissure, and the development pattern is related to the size of overlying rock pressure and the length of primary fissure in thin bedrock. The four stages of crack propagation and development under the action of different primary fracture length, overburden pressure and water and sediment are studied, and the failure curves are given. The quantitative relationship between the influence of different conditions on the crack propagation of thin bedrock is analyzed.
【作者单位】：中国矿业大学力学与建筑工程学院;中国矿业大学深部岩土力学与地下工程国家重点实验室;
【基金】：国家重点基础研究发展计划(973)资助项目(2015CB251601) 国家自然科学基金资助项目(51322401,51421003)
【分类号】：TD315

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