本文選題：圍巖穩(wěn)定性　切入點(diǎn)：非對(duì)稱(chēng)載荷　出處：《西安科技大學(xué)》2015年碩士論文

【摘要】：大傾角松軟厚煤層綜放工作面運(yùn)輸巷圍巖應(yīng)力環(huán)境復(fù)雜,頂板易冒落,支護(hù)困難,影響礦井安全生產(chǎn)。研究大傾角松軟厚煤層綜放工作面運(yùn)輸巷支護(hù)技術(shù),對(duì)豐富復(fù)雜條件下回采巷道支護(hù)技術(shù)具有重要意義。本文針對(duì)長(zhǎng)山子煤礦1123綜放工作面運(yùn)輸巷,通過(guò)現(xiàn)場(chǎng)調(diào)研、模擬研究、理論分析和現(xiàn)場(chǎng)監(jiān)測(cè)相結(jié)合的研究方法,對(duì)大傾角松軟厚煤層綜放工作面運(yùn)輸巷圍巖進(jìn)行了較為系統(tǒng)地研究,結(jié)果表明:(1)支護(hù)體受載和圍巖變形破壞呈非對(duì)稱(chēng)性特征。巷道以頂板失穩(wěn)為特點(diǎn),失穩(wěn)形式分為兩種,一種為從下幫側(cè)拱角處誘發(fā)的圍巖失穩(wěn),圍巖首先從下幫側(cè)拱角處發(fā)生破壞,破壞方式為:產(chǎn)生裂隙—彎曲—斷裂—回轉(zhuǎn)—垮落,頂板垮落過(guò)程分為回轉(zhuǎn)垮落和下沉垮落,另一種為頂板離層誘發(fā)的頂板失穩(wěn),該失穩(wěn)方式以下沉垮落為特點(diǎn)。(2)直墻圓弧拱形巷道下幫側(cè)拱角處是 圍巖-支護(hù)‖結(jié)構(gòu)體失穩(wěn)誘發(fā)點(diǎn),較矩形巷道,其圍巖結(jié)構(gòu)最大剪力平均降低46.5%,最大彎矩平均降低56.5%。(3)巷道頂板淺基點(diǎn)和深基點(diǎn)的離層預(yù)警值可由上覆巖層載荷、巷道寬度、圍巖彈性模量、錨桿控制范圍及錨索特性確定,長(zhǎng)山子煤礦1123綜放工作面運(yùn)輸巷頂板離層儀淺基點(diǎn)預(yù)警值為60mm,深基點(diǎn)預(yù)警值為140mm。(4)采用綜掘工藝和以 大、小結(jié)構(gòu)理論‖為基礎(chǔ)的錨網(wǎng)索+鋼筋梯協(xié)調(diào)支護(hù)技術(shù)確定支護(hù)參數(shù)為錨桿間排距800×800mm,錨索間距1200mm,排距為1600mm�！，F(xiàn)場(chǎng)監(jiān)測(cè)表明,錨索受載錨桿受載,頂板錨桿受載下幫錨桿受載上幫錨桿受載,巷道支護(hù)參數(shù)適合于1123綜放工作面運(yùn)輸巷,取得了良好的經(jīng)濟(jì)效益。
[Abstract]:The surrounding rock stress environment of transportation roadway is complex, the roof caving is easy to fall and the support is difficult, which affects the safe production of coal mine. This paper studies the supporting technology of the transportation roadway of the fully-mechanized caving face in the large inclined soft and thick coal seam. This paper aims at the transportation roadway of 1123 fully-mechanized caving face of Changshanzi Coal Mine, through field investigation, simulation study, theoretical analysis and field monitoring. This paper makes a systematic study on the surrounding rock of the transportation roadway in the fully-mechanized caving face with large dip angle and soft and thick coal seam. The results show that the load-bearing and the deformation failure of the wall rock are asymmetrical. The roadway is characterized by roof instability, which is divided into two types. One is the instability of the surrounding rock induced by the arch corner of the lower side side. The failure of the surrounding rock occurs from the arch corner of the lower side side at first. The failure mode is as follows: fissure-bending, fracture, revolution and collapse, and the process of roof collapse is divided into rotary collapse and sinking collapse. The other is the roof instability induced by roof separation, which is characterized by subsidence and collapse. The arch corner of the bottom side of the arc-arched roadway with straight wall is the point induced by the instability of surrounding rock and support structure, which is more than that of rectangular roadway. The maximum shear force of surrounding rock structure is reduced by 46.5, and the maximum bending moment is reduced by 56.55.The maximum bending moment is reduced by 56.5and 56.50.The early warning values of shallow base point and deep base point of roadway roof can be determined by the load of overlying rock, the width of roadway, the elastic modulus of surrounding rock, the control range of anchor rod and the characteristic of anchor cable. In Changshanzi Coal Mine 1123 fully mechanized caving face, the early warning value of shallow base point and 140mm. 4) is 60mm and 140mm respectively. Based on the theory of small structure, the supporting parameters are determined as 800 脳 800mm between anchors, 1200mm between anchors and 1600mm.The field monitoring shows that the anchor cables are loaded with anchors, and the supporting parameters are determined as 800 脳 800mm, 1200mm and 1600mm.The results of field monitoring show that the anchor cables are loaded. The roof bolt is loaded and the upper side bolt is loaded and the supporting parameters of roadway are suitable for the transportation roadway of 1123 fully mechanized caving face and good economic benefits have been obtained.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TD353

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