Experimental study of the self-healing property of damaged salt rock by Brazilian splitting
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摘要: 鹽巖的損傷愈合特性對地下鹽穴儲庫的長期密閉性具有重要影響。為了探究損傷鹽巖的愈合特性，設計了巴西劈裂損傷鹽巖的自愈合實驗。在無應力條件下，讓巴西劈裂損傷鹽巖在不同濕度條件下愈合120 d，通過實驗過程中試樣滲透率的變化定量判斷損傷鹽巖愈合程度，探究了損傷鹽巖在不同濕度和恢復時間條件下的愈合效果；同時，通過掃描電子顯微鏡對損傷鹽巖愈合后的細觀形貌進行了觀察，探討了鹽巖損傷愈合的細觀機制。本實驗中，利用實驗前后滲透率的變化作為損傷鹽巖愈合的表征手段，有效避免了以往研究中利用試樣強度和彈性模量作為損傷愈合表征手段時因應變硬化導致的結果不可靠的情況。實驗結果表明，在無應力作用條件下，在無外界水分供給環境中試件經過120 d后仍然沒有發現愈合，證明水分是損傷愈合的必要條件。研究表明，時間和濕度對鹽巖的損傷愈合具有重要影響，鹽巖的損傷愈合效果在實驗范圍內隨著時間的增長和濕度的增大而增強，但增強速度呈指數降低，意味著過大的濕度和過長的時間難以有效提高鹽巖損傷愈合效果。Abstract: Given its good physical and mechanical properties and chemical stability, salt rock is considered to be the ideal rock mass for underground reservoir construction. To safeguard China’s energy security and strategic needs, a large number of underground salt cave reservoirs have been built in recent years. In view of the accidents caused by the instability of gas storage in foreign countries, the physical and mechanical properties of salt rock need to be investigated in depth to ensure the long-term stability of salt caverns. The damage-healing characteristics of salt rock have an important influence on the long-term airtightness of underground salt caverns. To examine the healing properties of damaged salt rock, a self-healing experiment was conducted on Brazilian cracked salt rock. Under the no-stress condition, the Brazilian cracked salt rock was healed under different humidity conditions for 120 days. The change in the permeability of the sample was quantitatively evaluated, and the damage-healing characteristics of salt rock under different humidity conditions and healing times were examined. In addition, the microscopic morphology of the damaged salt rock after healing was observed through scanning electron microscopy, and the mesoscopic mechanism of salt rock damage healing was discussed. In this experiment, the change in the permeability of the sample before and after the experiment was used to characterize salt rock damage, which effectively avoided the unreliable results obtained in previous studies through strain hardening, where the strength and elastic moduli of the samples were used to assess damage healing. The experimental results show that, under the no-stress condition, the specimens placed in the environment without external water supply are not healed after 120 days, which proves that water is a necessary condition for wound healing. Previous studies have shown that time and humidity have an important influence on salt rock damage healing. The damage-healing effect on salt rock increases with time and humidity. However, the rate of increase decreases exponentially, which indicates that excessive humidity and time do not effectively improve the damage-healing effect on salt rock.
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Key words:
- salt rock /
- damage /
- healing /
- Brazilian splitting /
- permeability
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圖 3 不同時間點鹽巖含水率與損傷愈合度關系圖
Figure 3. Moisture content–healing degree curves of salt rock damage healing under different time points
圖 4 不同時間點鹽巖含水率與損傷愈合度增長率關系圖
Figure 4. Moisture content–healing degree growth rate curves of salt rock damage healing under different time points
圖 5 不同含水率鹽巖損傷愈合時間與愈合度關系圖
Figure 5. Time–healing degree curves of salt rock damage healing under different moisture contents
圖 6 不同含水率鹽巖損傷愈合時間與愈合度增長率關系圖
Figure 6. Time–healing degree growth rate curves of salt rock damage healing under different moisture contents
圖 9 寬裂隙非均勻成核結晶愈合
Figure 9. Nonuniform nucleation in the middle part of large cracks healed
表 1 實驗方案
Table 1. Experimental scheme
Time/d Test number Moisture content 0% Moisture content 3% Moisture content 6% Moisture content 9% Moisture content 12% Moisture content 15% 7 A0 A3 A6 A9 A12 A15 15 B0 B3 B6 B9 B12 B15 30 C0 C3 C6 C9 C12 C15 60 D0 D3 D6 D9 D12 D15 120 E0 E3 E6 E9 E12 E15 
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表 2 自愈合實驗結果
Table 2. Experimental results of self-healing
Test number Healing degree/% Test number Healing degree/% Test number Healing degree/% A0 1.03 A3 66.59 A6 71.39 A9 74.71 A12 77.01 A15 92.33 B0 ?3.01 B3 81.40 B6 82.83 B9 78.40 B12 93.55 B15 95.13 C0 3.04 C3 88.33 C6 94.25 C9 94.03 C12 96.56 C15 94.22 D0 ?1.66 D3 87.68 D6 93.51 D9 93.29 D12 95.99 D15 97.79 E0 1.25 E3 90.41 E6 94.50 E9 94.60 E12 96.81 E15 97.84
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