大空间建筑环形点式重载作用下深废矿坑岩壁变形稳定性数值分析
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TU457

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国家自然科学基金(52078086);重庆市自然科学基金(cstc2020jcyj-jq0087);重庆市建设科技项目(2019-0045)


Numerical investigation on stability of disused deep mining pit under annular heavy point loading from large space structure
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    摘要:

    近年来,大城市工程建设急速发展,土地资源愈发紧张,一些矿产资源型城市中出现了利用废弃天然矿坑进行地下空间开发的改造项目。以长沙湘江欢乐城项目深废矿坑改造开发工程为背景,针对矿坑边坡稳定性以及受建筑结构点式荷载作用下的岩壁与基础协同作用问题,利用数值分析手段建立三维岩壁-建筑结构相互作用模型。研究岩壁在环形点式受荷条件下的表现,并探究遭遇突发性岩壁变形及承载状态变化后,岩壁与结构的稳定性变化情况。结果表明,在天然状况下废弃矿坑的开采高边坡基本处于稳定状态;而施工扰动和建筑荷载造成的应力变形仅发生于岩壁表面,未达岩体深部;岩壁由于突发灾害产生的局部大变形会严重危及支承其上的基础和结构安全;而在合理的建筑物环形点式基础设计布置情况下,基础结构的偶然失效不会影响岩壁和建筑物的稳定性。

    Abstract:

    Under the increasingly tense situation of land resources, in some mineral resource-based cities, utilization of disused mining pit has been promoted to improve the urban landscape or promote commercial significance. This paper focuses on the rock slope stability problem with reference to a deep mining pit renovation project in Changsha. The development pattern of rock deformation in both natural state and disturbed by construction activities is summarized through finite element analysis. For the rock slope suffering circular point heavy loading, the collaborative interaction between the rock and its overlying structures constitutes the research focus of this study. The results show that the disused deep mining pit is basically in a stable state without engineering activity, the construction disturbance and structural operation loads leave no significance impact to the rock slope stability. However, when the rock wall suffers paroxysmal failure, the local collapse or large deformation seriously endanger the safety of the mining pit and its overlying structures. As for the accidental failure of the foundation pile, it shows less effect on the stability of the rock wall and the building due to the well-behaved annular point foundation distribution.

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仉文岗,吴嘉昊,韩馥柽,何昌杰,李建新,黎泳钦.大空间建筑环形点式重载作用下深废矿坑岩壁变形稳定性数值分析[J].土木与环境工程学报(中英文),2021,43(5):19-26. ZHANG Wengang, WU Jiahao, HAN Fucheng, HE Changjie, LI Jianxin, LI Yongqin. Numerical investigation on stability of disused deep mining pit under annular heavy point loading from large space structure[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2021,43(5):19-26.10.11835/j. issn.2096-6717.2021.039

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  • 收稿日期:2020-12-13
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  • 在线发布日期: 2021-07-20
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