本文關(guān)鍵詞： 錨固失效 動(dòng)壓巷道 巷道變形控制 方案設(shè)計(jì)　出處：《湖南科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著開采深度的增加,厚層軟弱直接頂煤層高應(yīng)力巷道在動(dòng)壓作用下常出現(xiàn)嚴(yán)重的圍巖錨固失效現(xiàn)象,致使巷道劇烈變形,嚴(yán)重時(shí)會(huì)造成沖擊礦壓現(xiàn)象的出現(xiàn),這必然會(huì)對(duì)礦井安全高效生產(chǎn)帶來巨大的安全隱患,同時(shí)事故的發(fā)生也會(huì)造成重大的人員傷亡和經(jīng)濟(jì)損失。針對(duì)采動(dòng)作用下的高應(yīng)力厚層松軟直接頂煤巷錨固支護(hù)失效難題,本文以建新煤礦主采的B4煤層212工作面順槽地質(zhì)條件和支護(hù)技術(shù)為背景,通過綜合應(yīng)用錨固失效理論分析、FLAC3D軟件模擬及現(xiàn)場施工監(jiān)測等技術(shù)手段,對(duì)高應(yīng)力動(dòng)壓煤層巷道錨固失效進(jìn)行研究。研究成果:(1)分析了高應(yīng)力巷道圍巖錨固失效及變形破壞機(jī)理,錨桿支護(hù)錨固的是破碎巖體,巷道維護(hù)狀況就取決于破碎煤巖錨固體的力學(xué)性能,而錨固失效就是破碎煤巖錨固體在超前支承壓力作用下二次破裂。(2)揭示了高應(yīng)力作用下松軟直接頂煤巷錨固支護(hù)失效及控制機(jī)理,頂板錨索失效主要表現(xiàn)為與頂板同步下移而不破斷模式,錨桿的預(yù)緊力對(duì)錨固體力學(xué)特性產(chǎn)生重要影響。(3)運(yùn)用數(shù)值模擬對(duì)深部高應(yīng)力動(dòng)壓巷道圍巖應(yīng)力場、位移場及破壞場變化特征進(jìn)行了模擬研究,巷道受開挖擾動(dòng)影響,新掘巷道圍巖內(nèi)出現(xiàn)應(yīng)力集中現(xiàn)象,巷道圍巖變形程度較大,破壞程度較嚴(yán)重且隨著時(shí)間推移繼續(xù)加重。(4)從支護(hù)技術(shù)、巷道變形控制、錨桿和錨索的協(xié)調(diào)機(jī)制及施工工藝角度出發(fā),進(jìn)行了巷道支護(hù)加固方案及參數(shù)設(shè)計(jì)研究,提出了預(yù)應(yīng)力桁架支護(hù)體系、錨桿(索)、鋼帶及錨網(wǎng)聯(lián)合支護(hù)技術(shù)方案對(duì)煤巷變形破壞進(jìn)行有效控制。(5)通過數(shù)值模擬及現(xiàn)場實(shí)測,在新支護(hù)方案下,巷道圍巖應(yīng)力集中程度顯著降低,巷道圍巖變形量明顯降低,圍巖破壞范圍也明顯減小,巷道圍巖變形得到了有效控制。(6)對(duì)建新煤礦212工作面順槽巷道錨固失效進(jìn)行了分析并對(duì)巷道支護(hù)技術(shù)方案進(jìn)行了優(yōu)化設(shè)計(jì),提出針對(duì)煤巷圍巖控制的新技術(shù),并取得了很好的控制變形效果,大大提高了礦井的生產(chǎn)效率,對(duì)深井高應(yīng)力動(dòng)壓巷道圍巖穩(wěn)定性控制具有一定的借鑒意義。
[Abstract]:With the increase of mining depth high stress roadway of thick soft direct top coal seam often appears serious wall rock anchoring failure phenomenon under the action of dynamic pressure which results in severe deformation of roadway and the occurrence of rock burst phenomenon when serious. This will inevitably bring huge safety hidden danger to mine safety and efficient production. At the same time, the occurrence of accidents will also cause heavy casualties and economic losses. Based on the geological condition and supporting technology of No. 212 coal face in B4 coal seam of Jianxin coal mine, this paper analyzes the failure of Anchorage by comprehensive application of Anchorage theory. FLAC3D software simulation and site construction monitoring and other technical means. This paper studies the failure of roadway Anchorage in high stress dynamic pressure coal seam. The research result is: 1) the failure mechanism of surrounding rock Anchorage and deformation failure of high stress roadway is analyzed. The maintenance condition of roadway depends on the mechanical properties of rock and coal bolt. The Anchorage failure is the secondary rupture of rock anchors under the action of leading support pressure. It reveals the failure and control mechanism of anchoring support in soft direct roof roadway under high stress. The failure of roof anchor cable mainly shows that it moves down synchronously with the roof and does not break the mode. The stress field, displacement field and failure field of deep high stress roadway surrounding rock are simulated by numerical simulation. Under the influence of excavation disturbance, stress concentration phenomenon appears in the surrounding rock of new excavation roadway, the surrounding rock deformation degree of roadway is larger, the destruction degree is more serious, and with the time goes on, the stress concentration phenomenon appears in the surrounding rock of new excavation roadway. From the angle of roadway deformation control, coordination mechanism of anchor rod and anchor cable and construction technology, the design of roadway supporting scheme and parameters is studied, and the pre-stressed truss support system, anchor rod (cable) is put forward. Through numerical simulation and field measurement, under the new support scheme, the degree of stress concentration in surrounding rock of roadway is significantly reduced. The deformation of roadway surrounding rock is obviously reduced, and the damage range of surrounding rock is also obviously reduced. Effective control of surrounding rock deformation of roadway is obtained.) Anchorage failure of roadway in No. 212 face of Jianxin Coal Mine is analyzed and the technical scheme of roadway support is optimized. A new technology for controlling surrounding rock of coal roadway is put forward, and good deformation control effect is obtained, which greatly improves the production efficiency of coal mine, and has certain reference significance for the stability control of surrounding rock of roadway with high stress in deep mine.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TD353

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