煤层顶板砂岩高温状态下力学特征试验研究
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摘要
对44块鹤壁六矿煤层顶板砂岩试件在高温下和高温后的力学性质进行试验研究,揭示砂岩的强度和变形特征随温度的变化规律。试验结果表明:随温度升高,高温下和高温后的砂岩的弹性参数(峰值强度、弹性模量、变形模量)均逐渐降低,但总体变化趋势相似,个别试件的弹性参数在400℃前高于常温状态;两者相比,高温后砂岩的峰值强度、弹性模量和变形模量有所提高,两者受温度影响均以脆性破坏为主。这为研究煤炭地下气化时热作用下燃空区的围岩稳定及应力场和位移场的变化规律提供试验依据。
The mechanical experiment of 44 sandstone specimens in the sixth mine of Hebi under high temperature and after high temperature is introduced;and the regularities on the strength and deformation character with temperature varying are proposed. The results show that peak-value strength,elastic modulus,and deformation modulus of sandstone under high temperature and after high temperature are gradually decreased with general similar variation tendency. The elastic parameters of some specimens are higher than those under common temperature. Compared with both of them,the peak-value strength,elastic modulus,and deformation modulus of sandstone after high temperature increase by a little and they are all brittle fractures. The results provide experimental basis for stability of surrounding rock when heat exits in the place of firing and variation regularity of strain field and displacement field.
The mechanical experiment of 44 sandstone specimens in the sixth mine of Hebi under high temperature and after high temperature is introduced;and the regularities on the strength and deformation character with temperature varying are proposed. The results show that peak-value strength,elastic modulus,and deformation modulus of sandstone under high temperature and after high temperature are gradually decreased with general similar variation tendency. The elastic parameters of some specimens are higher than those under common temperature. Compared with both of them,the peak-value strength,elastic modulus,and deformation modulus of sandstone after high temperature increase by a little and they are all brittle fractures. The results provide experimental basis for stability of surrounding rock when heat exits in the place of firing and variation regularity of strain field and displacement field.
引文
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[3]刘淑琴,梁杰,余力.煤炭地下气化中控制CO2含量的辅助气化工艺研究[J].煤炭转化,1999,22(4):50–53.(Liu Shuqin,Liang Jie,Yu Li.Study on auxiliary gasification technology of CO2control in the process of underground coal gasification[J].Coal Conversion,1999,22(4):50–53.(in Chinese))
[4]崔元星,魏月红.煤炭地下气化过程的地球物理监测[J].中国煤炭,1997,23(3):35–36.(Cui Yuanxing,Wei Yuehong.The globalphysical monitoring about underground coal gasification process[J].China Coal Magazine,1997,23(3):35–36.(in Chinese))
[5]杨兰和,余力,梁杰,等.煤炭地下气化高温区探测的新手段——测氡技术[J].煤炭科学技术,1997,25(12):12–14.(Yang Lanhe,Yu Li,Liang Jie,et al.New monitoring ways in high temperature region of underground coal gasification—monitoring tritium technology[J].Coal Science and Technology,1997,25(12):12–14.(in Chinese))
[6]马瑞,卢民杰,杨晓东.不同温压条件下弹性波在岩石中传播速度的实验研究[J].地震地质,1996,18(3):259–265.(Ma Rui,Lu Minjie,Yang Xiaodong.Experiment study about elastic wave velocities in rocks under different pressures and temperatures[J].Seismology and Geology,1996,18(3):259–265.(in Chinese))
[7]刘斌.不同温压下岩石弹性波速度、衰减及各向异性与组构的关系[J].地学前缘,2000,7(1):247–257.(Liu Bin.Relations of elastic wave velocity and attenuation and their anisotropies to the fabric of rocks under different P-T conditions[J].Earth Science Frontiers,2000,7(1):247–257.(in Chinese))
[8]刘泉声,许锡昌.三峡花岗岩与温度及时间相关的力学性质试验研究[J].岩石力学与工程学报,2001,20(5):715–719.(Liu Quansheng,Xu Xichang.Experimental research on the mechanical properties of granite rock of Three Gorges Project and temperature and time[J].Chinese Journal of Rock Mechanics and Engineering,2001,20(5):715–719.(in Chinese))
[9]京宗輔.高圧水噴流におる高温岩石の掘削に関する基礎的研究[博士学位论文][D].仙台:东北大学,1991.(Jing Zongfu.Basic research on excavating high temperature rock by high pressure water jet[Ph.D.Thesis][D].Sendai:Northeastern University1991.(in Japanese))
[10]尤明庆,华安增.岩石试件单轴压缩的破坏形式与承载力的降低[J].岩石力学与工程学报,1998,17(3):292–296.(You Mingqing,Hua Anzeng.Fracture of rock specimen and decrement of bearing capacity in uniaxial compression[J].Chinese Journal of Rock Mechanics and Engineering,1998,17(3):292–296.(in Chinese))
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