Development of VSP Probe for Inspection of Blast Damaged Zone

爆炸损伤区检测用VSP探头的研制

• 批准号: 08555260
• 负责人: KANEKO Katsuhiko
• 金额: $ 3.71万
• 依托单位: HOKKAIDO UNIVERSITY (1997)Kumamoto University (1996)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08555260/
• 关键词: Rock Blasting; Blast-damaged zone; VSP probe; Smooth Blasting; Super-elastic alloy; TiNi alloy; Fracture mechanics; Dynamic fracture; 検層; ボアホール; 発破; 損傷; P波速度

A series of experimental and theoretical investigation for the evaluation ofblast damaged zone has been carried out. Results obtained are as follows.(1) A compact VSP system to evaluate the loosened zone caused by excavation blasting has been developed. A super-elastic alloy plate has been adopted as material for the spring which presses a vibration sensor to the borehole wall with constant force. It is confirmed that the blast-damaged zone around a tunnel can be measured easily and quickly by using the developed system.(2) The fragmentation process of rock in the smooth blasting was analyzed by FEM with taking into account the crack propagation and the effect of delay time accuracy on surface smoothness and remaining rock damage has been clarified. Especially, it is pointed out that the interference of dynamic and/or quasi-static stress fields induced by blasts of adjacent holes plays an important role to control the crack propagation in SB.(3) Induced stress in damaged zone around a tunnel excavated by smooth blasting has been measured by the stress relieving technique. It is confirmed that the smooth blasting using electronic detonators decreases the damaged area in remaining rock.

针对爆炸损伤区的评价进行了一系列的实验和理论研究。所得结果如下：(1)开发了一种紧凑的VSP系统来评估开挖爆破引起的松动带。采用超弹性合金板作为弹簧材料，以恒定的力将振动传感器压向钻孔壁。实践证明，利用所开发的系统可以方便、快速地测量隧道周围的爆炸损伤区域。(2)利用有限元分析了光面爆破中岩石的破碎过程，考虑了裂纹的扩展和影响。明确了延迟时间精度对表面光滑度和剩余岩石损伤的影响。特别指出，相邻孔洞爆破引起的动态和/或准静态应力场的干扰对于控制SB中裂纹的扩展具有重要作用。(3)隧道开挖隧道周围损伤区的诱发应力通过应力消除技术测量了光滑喷砂。经证实，电子雷管的顺利爆破减少了剩余岩石的受损面积。

项目成果

M.Yamamoto, K.Kaneko, A.Hirata and H.Matsunaga: "Development of smooth blasting design support system based on computor simulation" J.of Japan Explosives Society. Vol.58, No.3. 100-109 (1997)

M.Yamamoto、K.Kaneko、A.Hirata 和 H.Matsunaga：“基于计算机模拟的光滑爆破设计支持系统的开发”J.of Japan Explosives Society。

山本 雅昭: "地山損傷を考慮したスムースブラスティングの設計支援ツール" 火薬学雑誌. 58-3. 100-109 (1997)

Masaaki Yamamoto：“考虑地面损坏的平滑爆破设计支撑工具”《爆炸杂志》58-3 (1997)。

平田篤夫: "トンネル掘進発破によって励起される振動の振動レベル予測法" 火薬学会誌. 58・4. 176-183 (1997)

Atsuo Hirata：“隧道开挖和爆破引起的振动的振动水平预测方法”《炸药学会杂志》58・4（1997）。

山本雅昭: "地山損傷を考慮したスムースブラスティングの設計支援ツール" 火薬学会誌. 58・3. 100-109 (1997)

Masaaki Yamamoto：“考虑地面损坏的平滑爆破设计支撑工具”《炸药协会杂志》58・3（1997）。

平田 篤夫: "トンネル堀進発破によって励起される振動性の振動レベル予測法" 火薬学雑誌. 58-4. 176-183 (1997)

Atsuo Hirata：“隧道爆破激发振动水平的预测方法”《炸药杂志》58-4（1997）。