本文選題：回采巷道　切入點：錨固體　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】：對于煤炭資源來說,在淺部適宜開采的儲量正在逐漸減少,因此向深部發(fā)展已經(jīng)成為大多數(shù)煤炭企業(yè)保證持續(xù)生產(chǎn)的必然選擇。在深部開采條件下回采巷道的穩(wěn)定性較淺部發(fā)生了較大變化,巷道易于破碎、難以維護且變形量大的特點顯現(xiàn)的更為突出。同時,在深部開采條件下,巷道圍巖所受的構(gòu)造應(yīng)力和自重應(yīng)力都顯著提高,增加了支護體支護的難度。不僅如此,深部巷道圍巖還面臨著"三高一擾動"即高地壓、高地應(yīng)力、高地溫和強烈的開采擾動所帶來的復(fù)雜地質(zhì)環(huán)境。傳統(tǒng)的巷道支護方式已經(jīng)不能適應(yīng)深部回采巷道,而新興的"錨網(wǎng)索"聯(lián)合支護方法又缺乏在深部開采環(huán)境下相關(guān)的理論研究。本文首先利用彈塑性力學(xué)的相關(guān)知識對深部回采巷道圍巖的破壞機理進行了理論研究,得到巷道變形破壞主要受破碎區(qū)圍巖厚度的影響,錨桿支護時通過增強錨固體彈性模量和減弱泊松比來提高錨固體的剛度,實現(xiàn)錨固體和圍巖變形在剛度上的耦合;錨索支護時充分發(fā)揮它的懸吊作用,利用錨索自身較強的抗拉強度增加錨固體的整體穩(wěn)定性,使得錨固體與圍巖變形在結(jié)構(gòu)方面達到耦合從而控制圍巖變形;利用有限差分軟件FLAC3D模擬了錨桿、錨索在不同長度和間排距下的支護效果,得到相關(guān)的塑性區(qū)圖、應(yīng)力云圖和垂直應(yīng)力云圖,分析模擬結(jié)果得到錨桿、錨索耦合支護時的長度、間排距和錨索布置方案,最終實現(xiàn)深部回采巷道圍巖變形與錨固體在剛度和結(jié)構(gòu)上的耦合,從而控制圍巖變形。
[Abstract]:For coal resources, the reserves that are suitable for exploitation in shallow areas are gradually diminishing. Therefore, the development of deep mining has become an inevitable choice for most coal enterprises to ensure continuous production. The stability of the roadway in deep mining has changed greatly in the shallow part, and the roadway is easy to be broken. At the same time, under the condition of deep mining, the structural stress and gravity stress of surrounding rock of roadway are significantly increased, which makes it more difficult to support the supporting body. The surrounding rock of deep roadway also faces the complex geological environment brought by "three high and one disturbance", that is, high ground pressure, high ground stress, gentle and strong mining disturbance in highland, and the traditional roadway support method can not adapt to the deep mining roadway. However, the new combined support method of "anchor, mesh and cable" lacks relevant theoretical research in deep mining environment. Firstly, the failure mechanism of surrounding rock of deep mining roadway is studied theoretically by using the relevant knowledge of elastic-plastic mechanics. It is found that the deformation and failure of roadway are mainly affected by the thickness of surrounding rock in the broken area. The stiffness of anchor body is improved by strengthening elastic modulus of anchor body and weakening Poisson's ratio, and the coupling of anchor body and surrounding rock deformation in stiffness is realized. When the anchor cable is supported, its suspending function is brought into full play, and the stability of the anchor body is increased by using the strong tensile strength of the anchor cable itself, so that the deformation of the anchor body and the surrounding rock can be coupled in structure to control the deformation of the surrounding rock. By using finite difference software FLAC3D, the support effect of anchor rod under different lengths and spacing is simulated, and the relative plastic zone diagram, stress cloud diagram and vertical stress cloud diagram are obtained. The results of simulation are analyzed and the length of anchor and cable coupling support is obtained. Finally, the coupling of surrounding rock deformation of deep mining roadway with the stiffness and structure of anchor body is realized, and the deformation of surrounding rock is controlled.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD353

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本文編號：1587622