力学与实践 ›› 2016, Vol. 38 ›› Issue (4): 403-406.DOI: 10.6052/1000-0879-15-254

• 应用研究 • 上一篇    下一篇

高温蒸汽作用下花岗岩热破裂的试验研究

张学尧, 杨栋   

  1. 太原理工大学采矿工艺研究所, 太原 030024
  • 收稿日期:2015-10-09 修回日期:2015-12-06 出版日期:2016-08-15 发布日期:2016-08-16
  • 通讯作者: 张学尧,E-mail:zxy1124@126.com

EXPERIMENTAL STUDY OF THERMAL CRACKING OF GRANITE UNDER HIGH TEMPERATURE VAPOR ACTION

ZHANG Xueyao, YANG Dong   

  1. Institute of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2015-10-09 Revised:2015-12-06 Online:2016-08-15 Published:2016-08-16

摘要:

利用自主研制的对流加热原位开采模拟实验台和真三轴压力机,研究了不均匀地应力状态下注蒸汽花岗岩热破裂的破裂规律.在本次试验条件下,花岗岩发生脆性破裂温度为483℃,蒸汽压力为10.6MPa;高温高压蒸汽作用下,花岗岩除了在沿着垂直于最小主应力方向产生主裂缝,还会由于热破裂,在其他方向产生一定数量随机分布的次生裂缝;不同方向裂缝的形成,对于形成相互连通的空间裂隙网络有实际意义,从而有助于提高地热开采效率.

关键词:

不均匀地应力|花岗岩|热破裂|高温蒸汽|裂缝

Abstract:

The thermal cracking of the steam granite is studied under the condition of the non uniform stress state by using the developed convection heating in situ mining simulation test rig and the true three axis press. Under this experimental condition, the granite undergoes brittle fracture, the brittle fracture temperature of the granite is 483℃, and the steam pressure is 10.6MPa. At the same time, under the action of the high temperature and high pressure steam, the main crack of the granite is along the direction normal to the minimum principal stress direction, in addition, due to the thermal cracking, a certain number of randomly distributed secondary cracks in other directions appear. Because of the formation of cracks in different directions, the space crack network connected with each other is of practical significance. The long term experiment study helps to improve the effciency of the geothermal exploitation.

Key words:

non uniform stress|granite|thermal cracking|high temperature steam|crack

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