张文杰,邓龙胜,于渤,杨洲,杜中东,宋方述,邹煜

• 1:长安大学地质工程与测绘学院
• 2:地质灾害成因机理与风险防控陕西省高等学校重点实验室
• 3:中国石油东方地球物理公司

摘要(Abstract)：

在黄土地区进行爆破施工时，爆破对黄土围岩的破碎效应和挤密效应，对工程施工质量及爆破施工设计至关重要。为探究在爆破作用下黄土围岩的破碎效应和挤密效应，进行现场爆破试验，并采用数字图像处理技术，提取爆腔围岩表面的裂隙和块体的特征，分析围岩的破碎特征。同时测量爆腔轮廓及周围裂隙，并进行室内试验，确定爆破土体分区及各分区范围。在现场实验基础上，利用LS-DYNA建立数值模型，并改变炸药长度，进行不同炸药量的黄土爆破模拟。结果表明:爆破后黄土可细分为5个区，分别为空腔区、破碎区、裂纹区、挤密区和弹性变形区，且每个区形状均为椭圆形。其中破碎区土体同时发育宽大的贯通裂隙与“细短型”裂隙，裂隙多以“T”型节点相交，块体多为不规则四边形，且块体形态复杂内部发育大量裂隙。而裂纹区裂隙以“细长型”为主，裂隙多以“Y”型节点相交，块体多为不规则五边形和六边形。在不同炸药量爆破作用下，爆腔与影响范围的径向半径与炸药量呈双曲线函数关系，两者的轴向半径与炸药量呈一次函数关系。

关键词(KeyWords)： 现场爆破试验;破碎特征;爆破土体分区;黄土爆破模拟;不同炸药量;影响范围

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2022YFC3003403);; 国家自然科学基金(42472348);; 中央高校基本科研业务费资助(300102265502)~~

作者(Author): 张文杰,邓龙胜,于渤,杨洲,杜中东,宋方述,邹煜

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