本文選題：圍巖弱化　切入點(diǎn)：滲流作用　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】：目前,隨著煤礦開采深度越來(lái)越深,地下水正逐漸成為影響巷道圍巖穩(wěn)定性的重要原因之一,位于巷道圍巖周圍的應(yīng)力場(chǎng)和位移場(chǎng)時(shí)刻都受到含水層的影響。本文通過(guò)現(xiàn)場(chǎng)調(diào)研,分析了引起巷道圍巖變形破壞的影響因素,再將理論分析和數(shù)值模擬相結(jié)合,對(duì)含水層作用下巷道圍巖的變形破壞機(jī)理進(jìn)行了分析。通過(guò)假設(shè)巖體是質(zhì)地均勻、各向同性的等效連續(xù)滲透介質(zhì),原巖應(yīng)力為各向等壓,滲流方向主要以徑向滲流為主,液體是單相、不可壓縮且為牛頓流體,滲透過(guò)程符合達(dá)西定律。應(yīng)用有效應(yīng)力代替總應(yīng)力的修正后的摩爾-庫(kù)倫屈服準(zhǔn)則,結(jié)合滲流作用及圍巖應(yīng)變軟化模型與破裂膨脹模型,求出圓形巷道圍巖變形破壞區(qū)域范圍,并推導(dǎo)出了巷道圍巖變形破壞后各區(qū)域的半徑和位移。通過(guò)算例分析,得出了支護(hù)阻力、原始滲透水壓力、應(yīng)變軟化以及破裂膨脹與有水作用下的巷道塑性區(qū)范圍之間的關(guān)系。研究表明,結(jié)合滲流作用、應(yīng)變軟化以及破裂膨脹特性情況下將會(huì)使結(jié)果更貼近于實(shí)際,能更加真實(shí)地顯現(xiàn)出圍巖變形破壞狀態(tài)。應(yīng)用flac3D數(shù)值模擬軟件,對(duì)照有滲流作用和無(wú)滲流作用下巷道的應(yīng)力場(chǎng)、位移場(chǎng)以及塑性區(qū)的變化規(guī)律,并且在有滲流作用下,討論了原支護(hù)方案支護(hù)效果的不足之處,同時(shí)對(duì)支護(hù)參數(shù)進(jìn)行優(yōu)化并提出了新的支護(hù)方案,最后利用數(shù)值模擬以及現(xiàn)場(chǎng)試驗(yàn)對(duì)新的支護(hù)方案進(jìn)行了驗(yàn)證,從而得知新的支護(hù)方案比原方案能更好地控制圍巖變形,這也為其他類似條件下工程的優(yōu)化支護(hù)設(shè)計(jì)及安全性評(píng)價(jià)提供了參考依據(jù)。
[Abstract]:At present, with the depth of coal mining is more and more deep groundwater is becoming one of the important factors affecting the stability of surrounding rock in roadway surrounding rock, the surrounding stress field and displacement field are always affected by aquifer. Through field investigation, analysis of the factors causing the deformation and failure of the roadway surrounding rock, the theoretical analysis and numerical combining simulation, the deformation and failure mechanism of roadway surrounding rock aquifer under the effect are analyzed. By assuming that the rock is homogeneous, isotropic continuous infiltration medium, the original rock stress for isotropic seepage pressure, mainly in the direction of radial flow, liquid phase, incompressible and Newton fluid permeability the process accords with Darcy's law. Moore modified effective stress instead of total stress in Kulun after the yield criterion, combined with the seepage and rock strain softening model and rupture expansion mode Calculate the damage area, deformation of circular tunnel, and deduces the surrounding rock deformation radius and displacement after each region. Through the example analysis, it was concluded that the support resistance, the original osmotic pressure, strain softening and expansion and rupture of roadway water under the action of the relationship between plastic zone. Research shows that the combination of seepage, strain softening and swelling characteristics of rupture case will make the results more close to the practice, can more accurately reveal the deformation and failure of surrounding rock. Using numerical simulation software flac3D, the control of stress seepage and seepage tunnel field, displacement field and plastic zone changes and, in under the action of seepage, discusses the original supporting scheme supporting effect of deficiencies, and to optimize the support parameters and proposes a new supporting scheme, finally using numerical simulation and field The new support scheme is verified by experiments, which shows that the new support scheme can better control the deformation of surrounding rock than the original scheme, which also provides a reference for other similar conditions of the optimal support design and safety evaluation of the project.

【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD322;TD353

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本文編號(hào)：1591111