Experimental study of the interaction of directional crack and open joint in slit charge blasting
-
摘要: 為了探究切縫藥包爆破定向裂紋與張開節理的相互作用過程，采用動態焦散線方法，結合高速攝影技術，開展了爆破模型實驗研究。研究結果表明，張開節理對切縫藥包爆破定向裂紋的擴展有阻滯作用，定向裂紋不會穿過張開節理繼續擴展，而是在經過與節理相互作用后在節理端部產生兩條翼裂紋。當定向裂紋垂直入射時，節理兩端的受力狀態基本相同，兩條翼裂紋的起裂和擴展行為基本一致，兩條翼裂紋的分布狀態基本對稱。張開節理的幾何特征對翼裂紋起裂時的動態應力強度因子有顯著影響，一定程度上決定了翼裂紋起裂的難易程度。當定向裂紋傾斜入射時，節理兩端的受力狀態存在差異，靠近定向裂紋入射點的一端能夠獲得更多的起裂能量，從而優先起裂和擴展，并形成更長的翼裂紋。Abstract: To explore the interaction between directional crack and open joint in slit charge blasting, a dynamic caustics method and high-speed photography technology were used to carry out the blasting model experiment. In the model experiment, the polymethyl methacrylate (PMMA) was used as the specimen material, the lead azide (Pb(N3)2) was used as the explosive, and a 3D printed resin material was used as the slit tube. Additionally, varying shapes of the open joint were prefabricated in the specimen. The failure mode of the specimen was described in detail, the initiation and propagation process of the wing crack at two ends of the joint was also analyzed. Research results show that the open joint has a retarding effect on the propagation of the directional crack in slit charge blasting. The directional crack will not continue to propagate through the open joint, but it will produce two wing cracks at the ends of the joint after interacting with the joint. When the directional crack is incident perpendicular to the open joint, the stress state at both the ends of the joint and the initiation and propagation behavior of the two wing cracks are the same, and the distribution state of the two wing cracks is symmetric. The geometric characteristics of the open joint have a significant impact on the dynamic stress intensity factor when the wing crack is initiated. Moreover, it determines the difficulty of the wing crack initiation to some extent. When the directional crack is incident obliquely, the stress state of the two ends of the joint is different. The end, which is close to the incident point of the directional crack, exhibits more crack initiation energy so that the crack is initiated and propagated preferentially and a longer wing crack is formed.
-
Key words:
- slit charge /
- blasting /
- open joint /
- caustics /
- crack propagation
-
圖 4 爆破后試件破壞形態與裂紋分布。（a）試件S1-1；（b）試件S2-1；（c）試件S3-1
Figure 4. Fracture patterns and crack distributions of the specimens after blasting: (a) specimen S1-1; (b) specimen S2-1; (c) specimen S3-1
5 爆破過程中裂紋起裂與擴展的動態焦散線系列照片。（a）試件S1-1；（b）試件S2-1；（c）試件S3-1
5. Dynamic caustics photos of the crack initiation and propagation during blasting: (a) specimen S1-1; (b) specimen S2-1; (c) specimen S3-1
圖 6 驗證實驗組試件S4–1爆破過程中裂紋起裂與擴展的動態焦散線系列照片
Figure 6. Dynamic caustics photos of the crack initiation and propagation in specimen S4–1 during blasting
圖 7 試件S1–1、S2–1和S3–1的翼裂紋起裂前后動態應力強度因子隨時間變化曲線
Figure 7. Time curves of the dynamic intensity factor of the wing cracks in specimens S1–1, S2–1, and S3–1
圖 8 試件S1–1和S4–1的翼裂紋擴展過程中動態應力強度因子隨時間變化曲線
Figure 8. Time curves of the dynamic intensity factor of the wing cracks in specimens S1–1 and S4–1
表 1 翼裂紋長度及其與切縫方向的夾角統計表
Table 1. Lengths of the wing cracks and their included angles with the slits
Wing crack Specimen S1-1 Specimen S2-1 Specimen S3-1 B1 B2 Average value B3 B4 Average value B5 B6 Average value Length / mm 56.8 58.5 57.7 50.3 52.5 51.4 63.1 60.4 61.8 Angle / (o) 10.2 10.6 10.4 11.6 10.6 11.1 13.8 14.8 14.3 
下載: 導出CSV
www.77susu.com<span id="fpn9h"><noframes id="fpn9h"><span id="fpn9h"></span> <span id="fpn9h"><noframes id="fpn9h"> <th id="fpn9h"></th> <strike id="fpn9h"><noframes id="fpn9h"><strike id="fpn9h"></strike> <th id="fpn9h"><noframes id="fpn9h"> <span id="fpn9h"><video id="fpn9h"></video></span> <ruby id="fpn9h"></ruby> <strike id="fpn9h"><noframes id="fpn9h"><span id="fpn9h"></span> -
參考文獻
[1] Guo D Y, Zhao J C, Zhu T G, et al. Crack propagation and coalescence mechanism of double-hole cumulative blasting in coal seam. Chin J Eng, 2020, 42(12): 1613郭德勇, 趙杰超, 朱同功, 等. 雙孔聚能爆破煤層裂隙擴展貫通機理. 工程科學學報, 2020, 42(12):1613 [2] Xu P, Chen C, Guo Y, et al. Experimental study on crack propagation of slit charge blasting in media with vertical bedding plane. J Min Sci Technol, 2019, 4(6): 498許鵬, 陳程, 郭洋, 等. 含垂直層理介質在切縫藥包爆破下裂紋擴展行為的試驗研究. 礦業科學學報, 2019, 4(6):498 [3] Yang R S, Zhang Z R, Yang L Y, et al. Cumulative blasting experiment study of slotted cartridge based on hard-rock rapid driving technology. Chin J Rock Mech Eng, 2013, 32(2): 317 doi: 10.3969/j.issn.1000-6915.2013.02.013楊仁樹, 張召冉, 楊立云, 等. 基于硬巖快掘技術的切縫藥包聚能爆破試驗研究. 巖石力學與工程學報, 2013, 32(2):317 doi: 10.3969/j.issn.1000-6915.2013.02.013 [4] Yang R S, Yang G L, Gao X T. Theory and Practice of Directional Fracture Controlled Blasting. Beijing: Science Press, 2017楊仁樹, 楊國梁, 高祥濤. 定向斷裂控制爆破理論與實踐. 北京: 科學出版社, 2017 [5] Cheng B, Wang H B, Zong Q. Numerical simulation on blasting mechanism of slotted cartridge based on coupled SPH-FEM algorithm. Chin J Energy Mater, 2020, 28(4): 300 doi: 10.11943/CJEM2018363程兵, 汪海波, 宗琦. 基于SPH-FEM耦合法切縫藥包爆破機理數值模擬. 含能材料, 2020, 28(4):300 doi: 10.11943/CJEM2018363 [6] Yue Z W, Yang L Y, Wang Y B. Experimental study of crack propagation in polymethyl methacrylate material with double holes under the directional controlled blasting. Fatigue Fract Eng Mater Struct, 2013, 36(8): 827 doi: 10.1111/ffe.12049 [7] Xiao Z X, Lu M, Lu Y S, et al. Dynamic photoelasticity experimental study on influence of slit’s width on slit chrage’s blast effect. J PLA Univ Sci Technol Nat Sci, 2006, 7(4): 371肖正學, 陸忞, 陸渝生, 等. 切縫寬度對藥包爆炸效應影響的動光彈試驗. 解放軍理工大學學報: 自然科學版, 2006, 7(4):371 [8] Wang Y B. Study of the dynamic fracture effect using slotted cartridge decoupling charge blasting. Int J Rock Mech Min Sci, 2017, 96: 34 doi: 10.1016/j.ijrmms.2017.04.015 [9] Song J S, Wang Y B, Gao X T, et al. The mechanism of directional fracture controlled blasting and its application. J Min Sci Technol, 2016, 1(1): 16宋俊生, 王雁冰, 高祥濤, 等. 定向斷裂控制爆破機理及應用. 礦業科學學報, 2016, 1(1):16 [10] Yang R S, Ding C X, Yang L Y, et al. Experimental study on the effects of joints on the blasting induced cracks propagation. J Vib Shock, 2017, 36(10): 26楊仁樹, 丁晨曦, 楊立云, 等. 節理對爆生裂紋擴展影響的試驗研究. 振動與沖擊, 2017, 36(10):26 [11] Aliabadian Z, Sharafisafa M, Mortazavi A, et al. Wave and fracture propagation in continuum and faulted rock masses: distinct element modeling. Arab J Geosci, 2014, 7(12): 5021 doi: 10.1007/s12517-013-1155-3 [12] Deng X F, Zhu J B, Chen S G, et al. Numerical study on tunnel damage subject to blast-induced shock wave in jointed rock masses. Tunnelling Underground Space Technol, 2014, 43: 88 doi: 10.1016/j.tust.2014.04.004 [13] Zhao A P, Feng C, Guo R K, et al. Effect of joints on blasting and stress wave propagation. Chin J Rock Mech Eng, 2018, 37(9): 2027趙安平, 馮春, 郭汝坤, 等. 節理特性對應力波傳播及爆破效果的影響規律研究. 巖石力學與工程學報, 2018, 37(9):2027 [14] Xie B, Li H B, Wang C B, et al. Numerical simulation of presplit blasting influenced by geometrical characteristics of joints. Rock Soil Mech, 2011, 32(12): 3812 doi: 10.3969/j.issn.1000-7598.2011.12.044謝冰, 李海波, 王長柏, 等. 節理幾何特征對預裂爆破效果影響的數值模擬. 巖土力學, 2011, 32(12):3812 doi: 10.3969/j.issn.1000-7598.2011.12.044 [15] Yang R S, Ding C X, Yang L Y, et al. Model experiment on dynamic behavior of jointed rock mass under blasting at high-stress conditions. Tunnelling Underground Space Technol, 2018, 74: 145 doi: 10.1016/j.tust.2018.01.017 [16] Hu R, Zhu Z M, Zhang X Y, et al. Effect of joint orientation on rock blasting. J Sichuan Univ Eng Sci, 2012, 44(S2): 41胡榮, 朱哲明, 張曉燕, 等. 節理方位對巖石爆破的影響規律. 四川大學學報: 工程科學版, 2012, 44(增刊2): 41 [17] Qu S J, Liu J F. Numerical analysis of joint angle effect on cracking with presplit blasting. Rock Soil Mech, 2015, 36(1): 189璩世杰, 劉際飛. 節理角度對預裂爆破成縫效果的影響研究. 巖土力學, 2015, 36(1):189 [18] Yang R S, Ding C X, Li Y L, et al. Crack propagation behavior in slit charge blasting under high static stress conditions. Int J Rock Mech Min Sci, 2019, 119: 117 doi: 10.1016/j.ijrmms.2019.05.002 [19] Li M, Zhu Z M, Liu R F, et al. Study of the effect of empty holes on propagating cracks under blasting loads. Int J Rock Mech Min Sci, 2018, 103: 186 doi: 10.1016/j.ijrmms.2018.01.043 [20] Li Q, Xu W L, Guo Y, et al. Propagation law of blasting crack at end of cylinder blasthole under uniaxial static pressure. J Vib Shock, 2020, 39(13): 91李清, 徐文龍, 郭洋, 等. 單向靜壓下柱狀炮孔端部爆生裂紋的擴展規律. 振動與沖擊, 2020, 39(13):91 [21] Ding C X, Yang R S, Lei Z, et al. Fractal damage and crack propagation in decoupled charge blasting. Soil Dyn Earthquake Eng, 2021, 141: 106503 doi: 10.1016/j.soildyn.2020.106503 [22] Yang L Y, Zhang Y J, Sun J C, et al. The effect of offset distance on dynamic fracture behavior of PMMA with double cracks. J Min Sci Technol, 2017, 2(4): 330楊立云, 張勇進, 孫金超, 等. 偏置裂紋對含雙裂紋PMMA試件動態斷裂影響效應研究. 礦業科學學報, 2017, 2(4):330 [23] Yang R S, Ding C X, Yang L Y, et al. Behavior and law of crack propagation in the dynamic-static superimposed stress field. J Test Eval, 2018, 46(6): 2540 [24] Qiu P, Yue Z W, Yang R S, et al. Modified mixed-mode caustics interpretation to study a running crack subjected to obliquely incident blast stress waves. Int J Impact Eng, 2021, 150: 103821 doi: 10.1016/j.ijimpeng.2021.103821 [25] Ding C X, Yang R S, Xiao C L, et al. Influence of the notch curvature on the impact fracture of the three-point bending beam. Eng Fract Mech, 2021, 241: 107419 doi: 10.1016/j.engfracmech.2020.107419 [26] Yue Z W, Han R J, Hao W F, et al. Experimental study on caustics of interraction between matrix crack and difformity inclusion. Eng Mech, 2015, 32(10): 198 doi: 10.6052/j.issn.1000-4750.2014.03.0143岳中文, 韓瑞杰, 郝文峰, 等. 基體裂紋?異型夾雜相互作用焦散線實驗研究. 工程力學, 2015, 32(10):198 doi: 10.6052/j.issn.1000-4750.2014.03.0143 -
點擊查看大圖
圖(9) / 表(1)
計量
- 文章訪問數: 1250
- HTML全文瀏覽量: 308
- PDF下載量: 72
- 被引次數: 0
