刘振朋,王玉杰,韩高升,谭海,吴汉桥,任高峰

• 1:武汉理工大学资源与环境工程学院
• 2:金诚信矿业管理股份有限公司
• 3:中铁第四勘察设计院集团有限公司

摘要(Abstract)：

武汉杨泗港长江大桥桥墩坐落在硬质黏土层上,沉井施工中为剔除厚井壁下的黏土,设计用钻孔爆破方法将黏土抛出。为确保桥墩地基和沉井壁的安全,运用有限元数值模拟软件ANSYS/LS-DYNA,研究了水下爆炸荷载对基底持力层黏土性质的影响,分析了不同装药量对临空面部分黏土的抛掷效果及最佳装药量下沉井下方黏土的应力、密度等物理力学性质的变化规律,并将之与室内试验结果对比。研究表明:当装药量达到4 kg时,其产生的爆破荷载可将临空面部分的硬质黏土抛掷开,此时装药量达到最佳;爆炸应力随时间的推移不断衰减,其传播规律与实际相同;在最佳装药量下,炮孔下方硬质黏土在爆后密度随爆心距的增大而不断减小,直到其初始密度值;模拟结果与室内试验结果吻合较好,验证了模拟的可靠性。

关键词(KeyWords)： 桥墩沉井;水下爆破;硬质黏土;压实;抗剪强度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51774220)

作者(Author): 刘振朋,王玉杰,韩高升,谭海,吴汉桥,任高峰

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