富水条件下软破岩层深井筒支护参数优化研究
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TD352

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国家自然科学基金项目(面上项目,重点项目,重大项目);福建省自然科学基金;紫金矿业集团股份有限公司2022年科技计划项目;福复泉自创区协同专项资助项目


Study on Support Parameters Optimization of Deep Shaft in Soft-fractured Strata with Water-rich
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    摘要:

    针对富水条件下软破岩层深井筒快速掘进中存在的衬砌开裂、支护成本高等问题,以境外某铜金矿进风井-906~-1158m段为工程背景,采用理论计算、数值模拟、现场试验进行深井井筒支护参数研究。为合理且有效地抑制井筒变形、降低支护成本,结合工程实际建立了井筒模型,采用FLAC3D有限差分软件,在考虑流固耦合情况下,分析不同支护参数下围岩的稳定性。结果表明:对于III级围岩段,采用“锚网喷+钢纤维混凝土”支护方式,其支护参数为:锚杆直径22 mm,长度为2.3 m,喷浆厚度50 mm,间排距1 m×1 m,钢纤维混凝土厚度550 mm;对于局部存在的IV~Ⅴ围岩段,采用“锚网喷+泡沫板+钢纤维混凝土”支护,锚网喷与III级围岩支护参数一致,泡沫板厚度为100 mm,钢纤维混凝土厚度600 mm。现场收敛测试结果表明,开挖412h后井筒围岩的平均收敛速度为0.18~0.31 mm/d,符合进风井的施工要求。通过III级、IV~Ⅴ围岩段的支护优化研究及现场实施,井筒施工效率较国内同类型深竖井提升约23.5%,研究成果可为高应力富水软破岩层井筒的支护设计提供指导。

    Abstract:

    In response to problems of rapid excavation of deep shafts, such as lining cracking and high support costs, based on the engineering background of -906 ~ -1158 section of an overseas copper and gold mine, the support parameters of shaft were studied by theoretical calculations, numerical simulations and field tests. In order to restrict deformation of the shaft and reduce the cost of support reasonably and effectively, a shaft model was established based on the engineering practice, the stability of surrounding rock with the different parameters was analyzed by FLAC3D numerical software combined with fluid-structure interaction. The results demonstrated that for the class III surrounding rock, "anchor net spraying + steel fiber concrete" support is adopted, and its parameters are as follows: bolt diameter 22mm, length 2.3m, shotcrete thickness 50mm, row spacing 1m×1m, steel fiber concrete thickness 550mm; For the locally existing class IV~V surrounding rock, this paper proposes to "anchor net spray + foam board + steel fiber concrete" support, and the thickness of buffer layer foam board is 100mm, and the thickness of steel fiber concrete is 600mm. Field test results show that the average convergence rate of surrounding rock is 0.18 ~ 0.31mm/d after 412h excavation, which meets the requirements of air inlet shaft construction, and the construction efficiency is improved by about 23.5% compared with the domestic deep shaft. This work can provide a guidance for the support design of shaft in soft-fractured strata with water-rich.

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黄敏,魏军强,谢成龙,等. 富水条件下软破岩层深井筒支护参数优化研究[J]. 科学技术与工程, 2025, 25(14): 5795-5805.
Huang Min, Wei Junqiang, Xie Chenglong, et al. Study on Support Parameters Optimization of Deep Shaft in Soft-fractured Strata with Water-rich[J]. Science Technology and Engineering,2025,25(14):5795-5805.

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  • 收稿日期:2024-09-20
  • 最后修改日期:2025-02-14
  • 录用日期:2024-11-17
  • 在线发布日期: 2025-05-22
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