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深部岩石工程处在高应力、高水压力、高地热等复杂地质环境中,这些因素相互作用将对岩石的渗透特性产生重要影响,进而影响深部岩石工程的安全和生产效率。通过开展不同温度(25℃~90℃)条件下的同一块石灰岩裂隙多场耦合渗透特性变化试验,得到了温度因素对石灰岩裂隙渗透特性的影响规律。试验结果表明:在恒定有效压力作用下,升温阶段的初始时刻有一个流量峰值过程,温度恒定时,流量缓慢减小并最终趋于稳定状态;温度升高使得岩石裂隙渗透率单调下降,裂隙开度进一步减小;此外,温度越高,初始阶段裂隙开度闭合速度快,趋于稳定开度值历时越短且最终稳定开度值越小。石灰岩的侵蚀溶解速度随温度的升高而加快,裂隙面溶解出的矿物质增多,因此,渗出液中各离子的浓度随温度的升高变大。
Deep rock engineering in high stress, high water pressure, high geothermal and other complex geological environment, the interaction of these factors will have a significant impact on the permeability of rocks, thereby affecting the safety of deep rock engineering and production efficiency. The influence of temperature on the infiltration characteristics of limestone fractures was obtained by carrying out tests on the variation of multi-field coupling and permeation characteristics of the same limestone fracture under different temperatures (25 ℃ -90 ℃). The experimental results show that there is a flow peak process at the initial time of the temperature rising stage under the constant effective pressure. When the temperature is constant, the flow rate decreases slowly and eventually tends to be steady. The temperature increases the permeability of the rock crack monotonically, Degree further reduced; In addition, the higher the temperature, the initial stage of the crack opening closure speed is fast, tends to stabilize the opening value lasted longer and the final value of the smaller stable opening. The erosion dissolution rate of limestone accelerates with the increase of temperature, and the minerals dissolved in the fracture surface increase. Therefore, the concentration of each ion in the effluent becomes larger with the increase of temperature.