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首次运用光学原理钻孔变形观测仪对600℃以内,6000 m埋深静水应力以内花岗岩中钻孔变形规律及其稳定性条件进行了深入细致的实验研究。研究发现:①高温高压下花岗岩中钻孔变形根据温度和埋深应力不同,可分为黏弹性变形、黏弹–塑性变形及破坏3个阶段;②恒温恒压下花岗岩中钻孔变形具有明显的时效特性,随着时间的延长,钻孔孔壁位移逐渐增大,孔径缩小,钻孔蠕变变形量达到一定量后趋于稳定,钻孔并不发生破坏;③温度和加载应力对钻孔变形具有很大影响,保持岩体加载应力不变,逐渐升高温度,钻孔变形逐渐增大,直径缩小,温度保持不变,加载应力越大,钻孔孔壁变形量越大,钻孔内径就越小。
For the first time, the principle of borehole deformation in granite with hydrostatic stress of 6000 m and its stability conditions were studied in detail using optical principle drilling deformation observation instrument. The results show that: (1) The deformation of drilling holes in granite under high temperature and high pressure can be divided into three stages of viscoelastic deformation, viscoelastic-plastic deformation and failure according to different temperature and depth of burial; (b) The deformation of drilling holes in granite under constant temperature and pressure is obvious With the time prolonging, the displacement of the borehole wall gradually increases, the pore size decreases, the creep deformation of the borehole reaches a certain amount and then tends to be stable, and the drilling does not occur. (3) Hole deformation has a great impact, to keep the rock load stress unchanged, and gradually increase the temperature, drilling deformation gradually increased, the diameter decreases, the temperature remains unchanged, the greater the load stress, the greater the deformation of the hole wall drilling, drilling The smaller the hole diameter.