本文關(guān)鍵詞： 軟巖巷道支護(hù) 三心拱U型鋼支架 結(jié)構(gòu)補(bǔ)強(qiáng) 聯(lián)合支護(hù)　出處：《安徽理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著開挖深度的不斷增加,巷道圍巖與支護(hù)結(jié)構(gòu)所承受的礦山壓力也越來越大,高應(yīng)力軟巖巷道支護(hù)成為亟待解決的重點(diǎn)和難題。U型鋼可縮性支架憑借初撐力高、抗拉抗壓強(qiáng)度高、斷面利用率高、韌性性能良好和具有一定可縮性等優(yōu)點(diǎn),成為深井軟巖巷道的主要支護(hù)方式之一。但在工程實(shí)際中,U型鋼支架往往因?yàn)槭芰Σ痪鶆蚨a(chǎn)生屈曲破壞,嚴(yán)重影響巷道的正常使用。對于一些已經(jīng)發(fā)生嚴(yán)重變形,甚至威脅安全生產(chǎn)的巷道,采取科學(xué)有效的修復(fù)補(bǔ)強(qiáng)方法進(jìn)行加固,對于恢復(fù)其正常使用和安全生產(chǎn),具有重大的經(jīng)濟(jì)意義。本文以海孜煤礦Ⅲ1012工作面風(fēng)巷的沿空掘進(jìn)為研究背景,詳細(xì)介紹了軟巖巷道支護(hù)理論,并根據(jù)海孜礦復(fù)雜的地質(zhì)條件分析了海孜礦Ⅲ1012風(fēng)巷工作面破壞機(jī)理,提出了 U型鋼+棚腿補(bǔ)強(qiáng)錨桿聯(lián)合支護(hù)方式,聯(lián)合支護(hù)結(jié)構(gòu)是主動支護(hù)與被動支護(hù)的有機(jī)結(jié)合,能有效提高錨桿抗拉拔力,形成了錨桿與金屬棚架之間的相互促強(qiáng)機(jī)制,充分發(fā)揮了支護(hù)結(jié)構(gòu)整體的承載能力。本文采用數(shù)值計(jì)算方法求解補(bǔ)強(qiáng)前后支架內(nèi)外邊緣應(yīng)力,并在此基礎(chǔ)上對未補(bǔ)強(qiáng)前靠近棚腿弧線段半徑和補(bǔ)強(qiáng)后棚腿錨桿支護(hù)位置進(jìn)行計(jì)算優(yōu)化,結(jié)合巷道在補(bǔ)強(qiáng)前后所觀測計(jì)算的變形速度,檢驗(yàn)修復(fù)補(bǔ)強(qiáng)手段的有效性,為我國深井軟巖巷道變形失穩(wěn)的治理提供一些參考和經(jīng)驗(yàn)。
[Abstract]:With the increasing of excavation depth, the surrounding rock and the supporting structure of roadway bear more and more mine pressure, and the high stress soft rock roadway support becomes the key and difficult problem to be solved urgently. It has the advantages of high tensile compressive strength, high utilization ratio of section, good toughness and certain shrinkage, etc. It has become one of the main supporting methods of soft rock roadway in deep well. However, in engineering practice, U-shaped steel support often produces buckling damage due to uneven force, which seriously affects the normal use of roadway. For some of them, serious deformation has occurred. Even those roadways that threaten safe production should be strengthened by scientific and effective methods of repair and reinforcement, so as to restore their normal use and safety in production. This paper introduces the supporting theory of soft rock roadway in detail, based on the research background of wind roadway along goaf of Haizi coal mine 鈪，

本文編號：1539349