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回采巷道片帮机制及控制技术研究

ISSN号：1000-7598
期刊名称：《岩土力学》
时间：0
分类：U452[建筑科学—桥梁与隧道工程;交通运输工程—道路与铁道工程]
作者机构：[1]安徽理工大学能源与安全学院,安徽淮南232001, [2]中国矿业大学深部岩土力学与国家重点实验室,江苏徐州221008, [3]三一重工股份有限公司,上海201400
相关基金：国家自然科学基金项目（No.50874103,No.50974115）; 江苏省自然科学基金项目（No.BK2008135）; 国家重点基础研究发展计划（973计划）资助项目（No.2010CB226805）; 国家重点实验室开放基金项目（No.SKLGDUEK0905）

关键词：片帮, 裂纹, 层裂结构, 注浆锚索, spalling off, fissures, spallation structure, grouting cable

中文摘要：

根据大采高工作面回采巷道帮部围岩的特点,采用断裂损伤理论、弹塑性理论建立了巷帮围岩层裂板结构力学模型,分析了霍州煤电辛置煤矿回采巷道帮部围岩失稳机制,并将注浆锚索支护方式首次应用于巷道帮部围岩的片帮治理。研究表明：回采巷道帮部围岩内部存在大量的裂纹,在高应力的作用下裂纹扩展发育,巷帮围岩演化为层裂板结构,当作用在巷帮围岩上的多重支承压力大于最小临界失稳载荷时即发生片帮;随煤岩体弹性模量、层裂板厚度的增大,层裂板发生失稳时破坏范围扩大;采用注浆锚索支护巷帮时浆液能够填满巷帮围岩深部裂隙,使巷帮围岩成为一个整体,提高了巷帮围岩支护结构的承载能力,控制了巷帮围岩片帮的发生。

英文摘要：

According to the sides＇ surrounding rocks characteristics of the mining roadway on the work-face with large mining height,a mechanics model about crack board structure of the sides surrounding rocks is established based on the fracture damage theory and plasticity theory,and the instability mechanism of the surrounding rocks of the mining roadway in the Xinzhi Mine,Houzhou Coal is analyzed,and the grouting-cable method is first used in supporting the surrounding rocks of the sides to limit it to be cut down.The results show that there are a lot of rock fissures in the sides of the back-extraction roadway,and the rock fissures develop under high stress,it makes the surrounding rocks of the sides evolve into the spallation board structure.When the multiple bearing pressure on the sides is greater than the smallest bucking critical load,the parts of sides will be cut down.With the increasing of the elastic modulus and spallation board thickness of coal rockmass,the failure scale of the spallation plate expands when instability occurs.Grouting-cable can be used to fill the deep fractures of the surrounding rocks,makes surrounding rocks as a whole,and improves the bearing capacity of supporting structure around the surrounding rocks of the roadway.

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