深井复杂地层高应力硐室与巷道支护技术研究
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摘要
本文采用现场实测、理论分析、数值模拟和相似模型实验相结合的研究方法,以唐口矿深部硐室与巷道支护为研究对象,开展了全面、系统的千米深井硐室与巷道围岩变形特征及控制技术研究,得到了以下主要研究成果：(1)测试了唐口煤矿-990水平的地应力,其特点是受向斜构造的影响,地应力有所变异,呈现为水平应力突出；(2)根据锚注加固结构体具有理想弹塑性特点,运用弹塑性理论分析了锚注加固结构弹塑性区的发展规律,提出锚注加固结构的极限承载能力计算公式,其承载能力可达13.9～33.0MPa,远高于普通支护提供的0.1～0.5MPa,也高于按弹性理论确定的极限承载能力；(3)通过对唐口煤矿巷道、峒室的现场勘察、调研,根据软岩巷道的支护特点和原则,通过数值模拟与相似模型实验,研究提出了墙体平面锚索桁架支护结构,减小了围岩的变形,明显地改善了围岩的受力状态,增加了支护结构体的承载能力；(4)采用抗—让—抗结合的支护体系加固治理泵房基础,即采用强抗支护泵基础底部,采用以让为主适当支护两泵基础中部的支护体系,有效地控制了底板的变形。
In this paper, Tangkou chamber and tunnel supporting in deep mine are researched with methods combined with the in-situ test, theoretical analysis, numerical simulation and similar model experiment. The deformation characteristics and reinforcement technique for the surrounding rock are comprehensively and systematiclly studied, have the following main results:(1)Overall-990level of Tangkou has higher stress, the main type of-990level is gravity stress; local impact of the syncline results in some variation of stress, showing for the levels of stress pronounced.(2)In accordance with the ideal elastic features of grouting anchor structure, plastic theory is applied to analyze the structure development pattern of elastic and plastic zone grouting anchor. Ultimate strenth formula of grouting anchor is proposed, the carrying capacity of it up to13.9-33.0MPa, much higher than the general support provided by the0.1-0.5MPa, also higher than the theory of elasticity determined by the ultimate bearing capacity.(3)Through on-site inspection, research, and stress testing, proposed the wall plane cable truss support structure are proposed, and can effectively improve the stress state of surrounding rock, improve the supporting structure bearing capacity, control the deformation of surrounding rock.(4)The anti-let-resistant combined supporting system are utlized to support pumping house foundation reinforcement, pump foundation bottom adopts the strong support, two pump is adopted between the main foundation to make appropriate support supporting system, effectively control the floor deformation.
In this paper, Tangkou chamber and tunnel supporting in deep mine are researched with methods combined with the in-situ test, theoretical analysis, numerical simulation and similar model experiment. The deformation characteristics and reinforcement technique for the surrounding rock are comprehensively and systematiclly studied, have the following main results:(1)Overall-990level of Tangkou has higher stress, the main type of-990level is gravity stress; local impact of the syncline results in some variation of stress, showing for the levels of stress pronounced.(2)In accordance with the ideal elastic features of grouting anchor structure, plastic theory is applied to analyze the structure development pattern of elastic and plastic zone grouting anchor. Ultimate strenth formula of grouting anchor is proposed, the carrying capacity of it up to13.9-33.0MPa, much higher than the general support provided by the0.1-0.5MPa, also higher than the theory of elasticity determined by the ultimate bearing capacity.(3)Through on-site inspection, research, and stress testing, proposed the wall plane cable truss support structure are proposed, and can effectively improve the stress state of surrounding rock, improve the supporting structure bearing capacity, control the deformation of surrounding rock.(4)The anti-let-resistant combined supporting system are utlized to support pumping house foundation reinforcement, pump foundation bottom adopts the strong support, two pump is adopted between the main foundation to make appropriate support supporting system, effectively control the floor deformation.
引文
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