烧变岩体特性及其注浆扩散行为研究

Study of peculiarity of burnt rock mass and its grouting spreading behavior

烧变岩是煤层自燃引起周围围岩变质而形成的特殊类岩石。通过现场取样,在实验室对烧变岩试样进行了物理力学性质测试,试验结果表明:烧变岩的含水率略有降低,而力学强度普遍增强,泊松比略变小,烧变岩体裂隙发育。注浆压力作用下,分析了裂隙尖端的劈裂情况,在此基础上,利用宾汉浆液扩散模型编制了浆液在裂隙网络中的流动扩散程序,可以模拟浆液在非贯通裂隙网络内的流动扩散范围。最后对柠条塔井田烧变岩体进行注浆试验,利用浆液流动模拟程序进行了注浆压力的优化选择,并将实际浆液扩散范围与程序模拟浆液扩散范围进行对比,二者结果较吻合,该程序可以用来指导现场注浆工程参数设计和施工,同时烧变岩体注浆试验也为类似工程注浆施工提供一定的参考依据。

Burnt rock is a special kind of rock which is formated from rock whose property has been changed due to coal autoignition.Its physico-mechanical property had been tested in laboratory.The results show that its moisture content has a little reduction;however,its mechanical strength is improved generally;and its Poisson's ratio has a little reduction too.The splitting conditions of crack tip are analyzed under grouting pressure.Based on this,the code of grouting spreading extent in fractured network is made by employing Bingham grouts spreading model,which can simulate the grouting spreading in intermitent fractured network.Finally,the grouting test is done in burnt rock mass in Ningtiaota Coal Mine;and the grouting pressure is optimized by utilizing grouting spreading program.Comparing the actual spreading extent to the simulating result,they are comparatively anastomotic.The program can guide the grouting parameter design and construction.