瓦斯压力对砂岩力学特性影响的试验研究

发布时间：2018-01-14 05:16

本文关键词：瓦斯压力对砂岩力学特性影响的试验研究　出处：《岩石力学与工程学报》2017年S1期 　论文类型：期刊论文

【摘要】：利用自行研制的"煤岩热流固耦合试验系统(THM 2)",以砂岩为研究对象,进行不同围压和不同瓦斯压力条件下的三轴加载试验,探讨瓦斯压力对岩石力学特性的影响,结果表明:3 MPa瓦斯压力下三轴抗压强度和弹性模量均比无瓦斯条件下小;相同应力下,含瓦斯岩石的应变较大。瓦斯压力对岩石的力学特性起到了弱化作用,使三轴抗压强度表现出一定的非线性特征。采用抛物线型、Hoek-Brown(H-B)等型式的强度准则对岩石的非线性强度特征进行研究,提出考虑瓦斯压力作用的修改型H-B强度准则,经验证修正后的强度准则与试验数据吻合良好,可以作为瓦斯压力作用下岩石破坏的强度判据。
[Abstract]:The triaxial loading test of sandstone under different confining pressure and different gas pressure was carried out by using the "coal rock thermal-fluid-solid coupling test system" developed by ourselves. The effect of gas pressure on the mechanical properties of rock is discussed. The results show that the triaxial compressive strength and elastic modulus are smaller at 1: 3 MPa gas pressure than under the condition of no gas. Under the same stress, the strain of the gas-bearing rock is larger. The gas pressure plays a weakening role on the mechanical properties of the rock, which makes the triaxial compressive strength show certain nonlinear characteristics. The parabola type is adopted. The nonlinear strength characteristics of rock are studied by Hoek-Browns-H-B) and other types of strength criteria, and a modified H-B strength criterion considering the effect of gas pressure is proposed. The modified strength criterion is in good agreement with the test data and can be used as the strength criterion of rock failure under the action of gas pressure.
【作者单位】：重庆大学煤矿灾害动力学与控制国家重点实验室;重庆大学资源及环境科学学院;重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室;
【基金】：国家自然科学基金资助项目(51434003,51374256) 中央高校基本科研业务费资助项目(106112015CDJRC241201)~~
【分类号】：TU45
【正文快照】： 3.重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室,重庆400030)随着工程开挖深度的增加,岩体赋存在越来越高的地应力环境中,显现的力学特性和浅部岩体有很大的差异,其强度具有明显的非线性特征。但地下空间内不仅存在地应力,有时还会有气体压力的存在,如油气资源的开采等,

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