曹永帮,黄俊红,王自旭,陈洋龙,张腾胜,李新平

• 1:武汉理工大学土木工程与建筑学院
• 2:武汉理工大学资源与环境工程学院
• 3:武汉理工大学三亚科教创新园

摘要(Abstract)：

为了研究不同炮孔间距下微差爆破诱发爆生裂纹的扩展规律，通过浇筑大面积混凝土场地进行试验来消除边界效应，并以电子雷管和导爆索作为爆源和炸药，开展多组直线三孔模型和十字五孔模型试验研究，记录不同爆破参数下爆生裂纹的扩展长度、方向以及止裂位置，结合时序控制爆破理论，探究影响裂纹扩展的主要因素。结果表明：当三孔模型中间孔先起爆，两边孔后起爆时，炮孔之间会形成贯通裂缝，但会随着炮孔间距的增加越来越不平直，直到炮孔间距达到25倍孔径时裂纹便无法贯通，且裂纹不沿炮孔方向发展；十字五孔模型试验中同样只有在炮孔间距为20倍孔径以内时才能形成贯通的裂缝，且当先爆孔起爆产生的裂纹向四个后爆孔扩展时，最终会优先与相近的炮孔贯通，但是裂纹扩展路径并非一条直线，其会同时受到多个后爆孔的影响而产生一定的偏转效应。因此，实际工程中要想利用空孔效应和起爆时差获得沿轮廓面扩展的平直裂缝，还需根据不同水文地质条件合理调整时序控制爆破参数。

关键词(KeyWords)： 三孔模型;五孔模型;空孔效应;微差爆破;裂纹扩展

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(52109165);; 中央高校基本科研业务费专项资金资助(项目批准号:2024IVA028)~~

作者(Author): 曹永帮,黄俊红,王自旭,陈洋龙,张腾胜,李新平

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