基于复合消能爆破技术的海底基坑开挖数值模拟研究  

Numerical Simulation Research on Submarine Foundation Pit Excavation based on Energy Dissipation Blasting Technology

作　　者：李腾飞 钟冬望[1,2] 司剑峰[1,2] 熊伟[1,2] 何理 李琳娜[1,2] 涂圣武[1,2] LI Teng-fei;ZHONG Dong-wang;SI Jian-feng;XIONG Wei;HE Li;LI Lin-na;TU Sheng-wu(College of Science,Wuhan University of Science and Technology,Wuhan 430065,China;Hubei Province Intelligent Blasting Engineering Technology Research Center,Wuhan University of Science and Technology,Wuhan 430065,China;Hubei Province Key Laboratory of Systems Science in Metallurgical Process,Wuhan 430065,China)

机构地区：[1]武汉科技大学理学院,武汉430065 [2]武汉科技大学湖北省智能爆破工程技术中心,武汉430065 [3]冶金工业过程系统科学湖北省重点实验室,武汉430065

出　　处：《爆破》2023年第1期139-146,共8页Blasting

基　　金：国家自然科学基金(51904210);冶金工业过程系统科学湖北省重点实验室开放研究基金项目(Z202001);湖北省重点研发计划项目(2020BCA084);武汉科技大学研究生创新创业基金。

摘　　要：水工建构筑物岩石基础开挖在整个工程项目中有着重要的作用,如何在保证结构基础开挖至指定标高的前提下减小对建基面岩体的破坏和损伤是爆破开挖的关键和难点所在。本文使用ANSYS/LS-DYNA有限元仿真模拟软件对水下40 m岩体在爆破开挖下的损伤状况进行了数值模拟.对复合消能结构、加入柔性垫层以及传统装药结构三种爆破技术分别在24.5 cm×24.5 cm×30 cm的岩体模型中进行爆破开挖模拟,模拟过程采用流固耦合算法,并对岩体模型添加0.4 MPa水压模拟40 m水深环境,结果发现在相同条件下,采用复合消能爆破技术可以使基底损伤深度减小38.89%,降低保留岩体能量传递30.52%,削弱保留岩体损伤程度30.90%。结果表明:复合消能结构可以有效控制建基面保留岩体损伤形态和范围,保护效果明显,可应用于水下岩体开挖的建基面保护工作。Rock foundation excavation plays an important role in the entire project of hydraulic structures.The key and difficult point of the blasting excavation is how to reduce the damage of the rock mass on the foundation surface under the premise of ensuring the excavation of the structural foundation to the specified elevation.In this paper,ANSYS/LS-DYNA finite element software is used to numerically simulate the blasting damage of the rock mass 40 m underwater.The blasting and excavation simulation of composite energy dissipation structure,flexible cushion and traditional charge structure is carried out in a 24.5 cm×24.5 cm×30 cm rock mass model,respectively.Fluid-structure coupling algorithm is used in the simulation process,and 0.4 MPa water pressure is added to simulate the 40 m water depth environment.The simulation results found that the damage depth of the basement,the energy transfer of the retained bedrock and the damage degree of the retained bedrock can be reduced by 38.89%,30.52%,and 30.90%respectively by using the composite energy dispassion blasting technology under the same conditions.The results also show that the energy dissipation structure can effectively control the damage form and scope of the rock mass retained on the foundation surface,which can be applied to the protection of foundation surface of underwater rock excavation.

关 键 词：海底基坑开挖 复合消能 岩体损伤控制 轴向应力衰减 数值模拟 

分 类 号：TD235.3[矿业工程—矿井建设]