高應變率下紅砂巖"凍傷效應"

楊陽; 楊仁樹

doi:10.13374/j.issn2095-9389.2019.01.14.002

高應變率下紅砂巖"凍傷效應"

doi: 10.13374/j.issn2095-9389.2019.01.14.002

楊陽^{1), 2)},
楊仁樹^3), ,

1).
昆明理工大學國土資源與工程學院, 昆明 650093
2).
云南農業大學水利學院, 昆明 650201
3).
北京科技大學土木與環境工程學院, 北京 100083

基金項目:

國家重點研發計劃資助項目 2016YFC0600903

國家自然科學基金資助項目 51564027

云南農業大學自然科學青年科研基金資助項目 2016ZR05

云南省應用基礎研究青年項目資助項目 2018FD025

詳細信息

通訊作者:
楊仁樹, E-mail: yrshu@cumtb.edu.cn

中圖分類號: TU458;TD315
計量
- 文章訪問數: 730
- HTML全文瀏覽量: 371
- PDF下載量: 15
- 被引次數: 0
出版歷程
- 收稿日期: 2019-01-14
- 刊出日期: 2019-10-01

"Frostbite effect" of red sandstone under high strain rates

YANG Yang^{1), 2)},
YANG Ren-shu^{3)
, ,}

1).
Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
2).
College of Water Conservancy, Yunnan Agricultural University, Kunming 650201, China
3).
School of Civil and Recourses Engineering, University of Science and Technology Beijing, Beijing 100083, China

More Information

Corresponding author: YANG Ren-shu, E-mail: yrshu@cumtb.edu.cn

摘要

摘要: 對低溫凍結紅砂巖進行動態沖擊實驗，研究高應變率下紅砂巖動態力學特性的溫度效應，運用損傷理論和能量理論，分析不同負溫對紅砂巖強度、損傷變量及能量耗散的影響，結合斷口形貌分析，探究紅砂巖在較低負溫下動態力學強度出現劣化的原因.研究表明：較低的負溫(-30℃后)會使紅砂巖出現"凍傷"，導致高應變率下巖石動態力學強度的急劇降低，宏觀上則容易出現動力擾動下的瞬時工程災變.根據斷口形貌分析，較低的負溫會導致紅砂巖內部組成物質間界面處生成大量裂紋，這些裂紋尖端塑性變形能力差，在高應變率加載下極易失穩擴展發生低應力脆性破壞，而膠結物由于組成礦物成分復雜更易受負溫影響，因此在動荷載和負溫雙重作用下往往是膠結物處先產生破壞，進而引起紅砂巖整體的破裂.
- 紅砂巖 /
- 巖石動力學 /
- 耗散能 /
- 斷口形貌
Abstract: Under the action of negative temperature, the static strength of a rock increases; however, the rock will tend to be brittle, failure strain will decrease, and the rock will also bear the action of internal ice heave force, which leads to complex dynamic behavior of rocks under high strain rate loading. In addition, the geotechnical structures in cold regions are prone to sudden engineering disasters under dynamic disturbance. In this study, a dynamic impact experiment of low-temperature frozen red sandstone was carried out to investigate the temperature effect on the dynamic mechanical properties of red sandstone under high strain rate. Based on the damage theory and energy theory, the effects of different negative temperatures on the strength, damage variables, and energy dissipation of red sandstone were analyzed, and the reasons for the dynamic mechanical strength deterioration of red sandstone at lower negative temperatures were explored using fracture morphology analysis. Research shows that the low negative temperature (after -30℃) can cause a "frostbite" red sandstone, resulting in a sharp decrease in the dynamic mechanical strength of rocks under high strain rate, and transient engineering disasters can easily occur under dynamic disturbance. According to the fracture morphology analysis, the low negative temperature will cause a large number of cracks to be generated at the interface between the components in the red sandstone. The plastic deformation ability of the crack tip is poor, and the crack can easily lose stability and expand under high strain rates, resulting in the low-stress brittle failure. However, due to the complex mineral composition of the cementitious materials, they are more susceptible to negative temperature. Therefore, under the double action of dynamic load and negative temperature, the damage usually occurs first at the cementitious materials and then results in the fracture of the whole red sandstone.
- red sandstone /
- rock dynamics /
- dissipation energy /
- fracture morphology

HTML全文

圖 1 部分制備好的巖石試件

Figure 1. Part of rock specimens prepared

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圖 2 霍普金森試驗系統(SHPB)

Figure 2. SHPB experimental system

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圖 3 沖擊荷載下凍結紅砂巖應力-應變曲線. (a)飽水紅砂巖；(b)干燥紅砂巖

Figure 3. Stress-strain curve of frozen red sandstone under impact load: (a) saturated red sandstone; (b) dry red sandstone

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圖 4 不同凍結溫度下飽水紅砂巖沖擊破壞形態圖.(a) 25 ℃; (b) -5 ℃; (c) -10 ℃; (d) -20 ℃; (e) -30 ℃; (f) -40 ℃

Figure 4. Impact failure pattern of red sandstone at different freezing temperatures: (a) 25 ℃; (b) -5 ℃; (c) -10 ℃; (d) -20 ℃; (e) -30 ℃; (f) -40 ℃

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圖 5 不同凍結溫度下飽水紅砂巖動態抗壓強度變化曲線

Figure 5. Curve of dynamic compressive strength of saturated red sandstone at different freezing temperatures

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圖 6 不同凍結溫度下飽水紅砂巖破壞應變變化曲線

Figure 6. Failure strain change curve of saturated red sandstone at different freezing temperatures

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圖 7 不同凍結溫度下透射能和耗散能變化曲線

Figure 7. Transmission and dissipation energy curves at different freezing temperatures

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圖 8 不同凍結溫度下比能量吸收值變化曲線

Figure 8. Curve of specific energy absorption at different freezing temperatures

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圖 9 動態沖擊下損傷變量隨溫度變化

Figure 9. Damage variable vs temperature under dynamic impact

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圖 10 不同凍結溫度下干燥紅砂巖動態抗壓強度變化曲線

Figure 10. Curve of dynamic compressive strength of dry red sandstone at different freezing temperatures

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圖 11 紅砂巖在不同凍結溫度下的斷口形貌. (a)25 ℃; (b)-5 ℃; (c)-10 ℃; (d) -20 ℃; (e)-30 ℃(f)-40 ℃

Figure 11. Fracture morphology of red sandstone in different freezing temperatures: (a)25 ℃; (b)-5 ℃; (c)-10 ℃; (d) -20 ℃; (e)-30 ℃; (f)-40 ℃

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圖 12 局部微觀斷口形貌. (a)-40 ℃; (b)-30 ℃

Figure 12. Local microscopic fracture morphology: (a)-40 ℃; (b)-30 ℃

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表 1 紅砂巖基本物理參數

Table 1. Basic physical parameters of red sandstone

縱波速度/(m·s^-1)		干密度/(kg·m^-3)	飽和密度/(kg·m^-3)	飽水率/%
干燥	飽水	干密度/(kg·m^-3)	飽和密度/(kg·m^-3)	飽水率/%
2780	3651	2292	2371	3.46

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