王超, 张社荣, 李宏璧, 于茂. 2015: 复杂地质条件输水隧洞冻结施工段支护控制研究. 工程地质学报, 23(2): 311-319. DOI: 10.13544/j.cnki.jeg.2015.02.016
    引用本文: 王超, 张社荣, 李宏璧, 于茂. 2015: 复杂地质条件输水隧洞冻结施工段支护控制研究. 工程地质学报, 23(2): 311-319. DOI: 10.13544/j.cnki.jeg.2015.02.016
    WANG Chao, ZHANG Sherong, LI Hongbi, YU Mao. 2015: MEASURE OF SUPPORT CONTROL FOR FROZEN METHOD CONSTRUCTED ZONE OF WATER CONVEYANCE TUNNEL UNDER COMPLEX GEOLOGICAL CONDITIONS. JOURNAL OF ENGINEERING GEOLOGY, 23(2): 311-319. DOI: 10.13544/j.cnki.jeg.2015.02.016
    Citation: WANG Chao, ZHANG Sherong, LI Hongbi, YU Mao. 2015: MEASURE OF SUPPORT CONTROL FOR FROZEN METHOD CONSTRUCTED ZONE OF WATER CONVEYANCE TUNNEL UNDER COMPLEX GEOLOGICAL CONDITIONS. JOURNAL OF ENGINEERING GEOLOGY, 23(2): 311-319. DOI: 10.13544/j.cnki.jeg.2015.02.016

    复杂地质条件输水隧洞冻结施工段支护控制研究

    MEASURE OF SUPPORT CONTROL FOR FROZEN METHOD CONSTRUCTED ZONE OF WATER CONVEYANCE TUNNEL UNDER COMPLEX GEOLOGICAL CONDITIONS

    • 摘要: 穿越含水疏松砂岩层的深埋输水隧洞围岩稳定和支护控制问题是长距离输水生命线工程中的难点,其施工开挖和支护控制方法目前尚不完善。结合某深埋输水工程疏松砂岩层的支护工程实践,分析了疏松砂岩层冻结施工过程及解冻后土体力学性质的演化以及围岩支护联合受力机制,采用有限元法揭示了冻融过程下围岩的变形规律及支护受力演化特征,并提出疏松砂岩层冻结施工及分步联合支护的设计理念和支护方案。研究结果表明,采用分步联合支护方法能够得到较理想的支护效果,冻结施工段进行支护结构刚度设计和数值验证时应考虑冻融过程对围岩的扰动弱化,让各种支护手段在时间和空间上实现有效结合,使围岩和支护结构紧密结合,形成受力机制明确的联合受力体。

       

      Abstract: The stability analysis of surrounding rock and the measure of support control for the part of the loose sandstones layer in the water conveyance tunnel are difficult problems, because there is no perfect excavation and supporting control method. The evolution of the mechanical properties of the loose sandstones and the supporting force mechanism is analyzed under the engineering background of a domestic water conveyance tunnel. Sub-step supporting method and optimized supporting method for the frozen construction part across the loose sandstones layer are raised through theoretic and finite element simulation. The study shows that step by step combined support method can get ideal supporting effect. The disturbance attenuation should be considered during freezing and thawing process in carrying on the supporting structure stiffness design and numerical analysis. Supporting methods should consider geological conditions and make all of the supporting measures to achieve effective integration so as to make the supporting mechanism clear.

       

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