【摘要】：深部軟巖巷道具有變形大、地壓大以及支護困難等特點,深部軟巖巷道的破壞主要是由于圍巖與支護體力學(xué)特性不耦合引起的,極易從一個部位開始,迅速蔓延至整個支護系統(tǒng),導(dǎo)致其失去穩(wěn)定性。所以對深部軟巖巷道的承載結(jié)構(gòu)的耦合特性進行研究有著重要的現(xiàn)實意義。本文針對深部軟巖巷道,建立支護體與圍巖承載結(jié)構(gòu)之間的力學(xué)特性模型,利用彈塑性理論,求得圍巖在其承載范圍內(nèi)的破碎區(qū)、塑性區(qū)等范圍應(yīng)力與位移表達式。對其結(jié)構(gòu)進行分析,在圍巖的承載位置與參數(shù)的基礎(chǔ)上,討論圍巖與支護體的強度以及結(jié)構(gòu)參數(shù)的影響。從宏觀的角度對圍巖的承載結(jié)構(gòu)與支護體承載結(jié)構(gòu)之間在剛度、強度以及結(jié)構(gòu)上的耦合關(guān)系進行分析。在強度方面,支護力、殘余強度對實現(xiàn)圍巖承載結(jié)構(gòu)耦合有著重要作用,確定了二次合理支護時間,實現(xiàn)了承載結(jié)構(gòu)在時間和強度上的耦合。在圍巖與支護體剛度上,對支護體采用的錨索、錨桿以及注漿等技術(shù)手段進行分析,對圍巖的強度以及圍壓、應(yīng)力狀態(tài)等進行分析,實現(xiàn)圍巖結(jié)構(gòu)與剛度的耦合,達到減小圍巖的結(jié)構(gòu)擴展以及提高其自身的強度和承載能力的效果。利用FLAC3D數(shù)值模擬,并結(jié)合蘆嶺礦Ⅲ一采區(qū)石門實例進行深入研究,探求應(yīng)力、位移以及塑性等方面的結(jié)果分析。經(jīng)過深入的分析研究,驗證了耦合的實際意義。并結(jié)合現(xiàn)場的實際觀測,驗證了本文研究的正確性,對工程實踐有著重要的指導(dǎo)意義。
[Abstract]:Deep soft rock roadway is characterized by large deformation, high ground pressure and difficulty in supporting. The failure of deep soft rock roadway is mainly caused by the uncoupling of surrounding rock and supporting physical characteristics, so it is easy to start from one part. Rapidly spread to the entire support system, resulting in its instability. Therefore, it is of great practical significance to study the coupling characteristics of the bearing structure of deep soft rock roadway. In this paper, the mechanical characteristic model between the supporting body and the surrounding rock bearing structure is established for the deep soft rock roadway, and the expressions of stress and displacement in the broken area and plastic zone of the surrounding rock are obtained by using the elastic-plastic theory. Based on the analysis of the bearing position and parameters of the surrounding rock, the influence of the strength of the surrounding rock and the supporting body as well as the structural parameters are discussed. The coupling relations between the bearing structure of surrounding rock and the bearing structure of supporting body in stiffness, strength and structure are analyzed from the macroscopic point of view. In terms of strength, support force and residual strength play an important role in realizing the coupling of surrounding rock bearing structure. The second reasonable supporting time is determined and the coupling of time and strength of bearing structure is realized. In the aspect of the stiffness of surrounding rock and supporting body, the technical means of bolting cable, bolt and grouting are analyzed, and the strength, confining pressure and stress state of surrounding rock are analyzed to realize the coupling of surrounding rock structure and stiffness. It can reduce the structure expansion of surrounding rock and improve its strength and bearing capacity. By using FLAC3D numerical simulation and combining with the example of Shimen in No. 鈪，

本文編號：2179101