Chen Jie, Ren Song, Yang Chunhe, Jiang Deyi, Li Lin
State Key Laboratory of Coal Mine Disaster Dynamics and Controls, Chongqing University, Chongqing 400030, China.
Institute of Rock and Soil Mechanics, The Chinese Academy of Science, Wuhan, Hubei 430071, China.
Materials (Basel). 2013 Aug 12;6(8):3438-3450. doi: 10.3390/ma6083438.
Salt deposits are commonly regarded as ideal hosts for geologic energy reservoirs. Underground cavern construction-induced damage in salt is reduced by self-healing. Thus, studying the influencing factors on such healing processes is important. This research uses ultrasonic technology to monitor the longitudinal wave velocity variations of stress-damaged rock salts during self-recovery experiments under different recovery conditions. The influences of stress-induced initial damage, temperature, humidity, and oil on the self-recovery of damaged rock salts are analyzed. The wave velocity values of the damaged rock salts increase rapidly during the first 200 h of recovery, and the values gradually increase toward stabilization after 600 h. The recovery of damaged rock salts is subjected to higher initial damage stress. Water is important in damage recovery. The increase in temperature improves damage recovery when water is abundant, but hinders recovery when water evaporates. The presence of residual hydraulic oil blocks the inter-granular role of water and restrains the recovery under triaxial compression. The results indicate that rock salt damage recovery is related to the damage degree, pore pressure, temperature, humidity, and presence of oil due to the sealing integrity of the jacket material.
盐层通常被视为地质能源储层的理想宿主。地下洞穴建设引起的盐层损伤可通过自愈得到减轻。因此，研究此类愈合过程的影响因素具有重要意义。本研究采用超声技术监测不同恢复条件下应力损伤岩盐在自恢复实验过程中的纵波速度变化。分析了应力诱导的初始损伤、温度、湿度和油对损伤岩盐自恢复的影响。损伤岩盐的波速值在恢复的前200小时内迅速增加，600小时后逐渐趋于稳定。损伤岩盐的恢复受到较高初始损伤应力的影响。水在损伤恢复中起着重要作用。当水充足时，温度升高会促进损伤恢复，但当水蒸发时则会阻碍恢复。残余液压油的存在阻碍了水的颗粒间作用，并抑制了三轴压缩下的恢复。结果表明，由于套管材料的密封完整性，岩盐损伤恢复与损伤程度、孔隙压力、温度、湿度和油的存在有关。
