本文選題：沉陷區(qū) + 開挖支護(hù)體系��； 參考：《中國礦業(yè)大學(xué)》2015年碩士論文

【摘要】：鐵路運(yùn)輸是我國煤炭運(yùn)輸?shù)闹饕緩�。國�?nèi)許多礦區(qū)的煤炭運(yùn)輸專線,由于其下方煤炭的開采,而隨著地表變形發(fā)生了沉陷。由此導(dǎo)致涵洞被破壞以及被淹沒在常水位下無法滿足過水要求的后果,此時(shí)必須對(duì)涵洞進(jìn)行改造重建。由于工程條件及各方面因素的限制,提出采用明挖法,以人工挖孔樁+內(nèi)支撐對(duì)開挖支護(hù)體系進(jìn)行支護(hù),在樁頂架設(shè)臨時(shí)架空體系保證正常通車的方法。在既有鐵路線下進(jìn)行涵洞改造,關(guān)鍵是為其提供滿足施工需要的空間以及保證上部鐵路的正常通行,開挖支護(hù)體系的穩(wěn)定性直接影響了改造涵洞工程的可能性以及鐵路的正常工作。本文在上述工程背景下,對(duì)沉陷區(qū)鐵路線下進(jìn)行開挖的情況進(jìn)行了研究,主要內(nèi)容和結(jié)論如下:首先,使用FLAC3D有限差分軟件對(duì)沉陷區(qū)鐵路線下開挖支護(hù)體系進(jìn)行數(shù)值模擬計(jì)算,分析了開挖支護(hù)體系在不同的支護(hù)樁嵌固深度、開挖寬度、內(nèi)支撐設(shè)置、列車荷載、分步開挖條件下支護(hù)樁的受力、變形及土體變形規(guī)律。結(jié)果表明上述因素均對(duì)支護(hù)樁的受力變形及土體變形造成不同程度的影響;基于以上研究結(jié)果,使用BP神經(jīng)網(wǎng)絡(luò),采用數(shù)值模擬計(jì)算結(jié)果作為訓(xùn)練樣本,嘗試對(duì)開挖支護(hù)體系中支護(hù)樁在不同條件下的水平位移進(jìn)行預(yù)測,結(jié)果表明神經(jīng)網(wǎng)絡(luò)預(yù)測結(jié)果與數(shù)值計(jì)算結(jié)果較接近,說明神經(jīng)網(wǎng)絡(luò)在開挖支護(hù)體系的計(jì)算中具有一定的適用性;最后,采用人工挖孔樁+內(nèi)支撐實(shí)際工程中進(jìn)行開挖支護(hù)效果明顯,能夠保證開挖支護(hù)體系的穩(wěn)定及保證正常行車。而分別采用數(shù)值模擬計(jì)算和工程計(jì)算,兩者在支護(hù)樁內(nèi)力及變形的計(jì)算上結(jié)果相符,而在分析坑底隆起和地表變形量時(shí),數(shù)值模擬的計(jì)算結(jié)果略小;在條件允許的情況下,應(yīng)用兩種方法進(jìn)行計(jì)算,綜合計(jì)算結(jié)果進(jìn)行設(shè)計(jì),才能取得更好的設(shè)計(jì)方案。
[Abstract]:Railway transportation is the main way of coal transportation in China. Because of the coal mining under the coal transportation line in many mining areas in China, subsidence occurs along with the surface deformation. As a result the culvert is destroyed and submerged under the constant water level which can not meet the requirement of overflowing. At this time the culvert must be rebuilt and rebuilt. Due to the limitation of engineering conditions and various factors, the method of using open excavation method to support the excavation support system with the support of manual excavated pile is put forward, and the temporary overhead system is set up on the top of the pile to ensure the normal opening to traffic. The key to the culvert reconstruction under the existing railway line is to provide it with space to meet the construction needs and to ensure the normal passage of the upper railway. The stability of excavation support system directly affects the possibility of culvert reconstruction and the normal work of railway. In this paper, the excavation of railway line in subsidence area is studied under the above engineering background. The main contents and conclusions are as follows: first, the numerical simulation of excavation and support system under railway line in subsidence area is carried out by using FLAC3D finite difference software. The stress, deformation and soil deformation of the excavation support system under the conditions of different embedded depth, excavation width, internal support setting, train load and step excavation are analyzed. The results show that all the above factors have different effects on the deformation of the supporting pile and the deformation of the soil, and based on the above research results, the BP neural network is used as the training sample, and the numerical simulation results are used as the training samples. This paper attempts to predict the horizontal displacement of supporting pile in excavation support system under different conditions. The results show that the prediction result of neural network is close to that of numerical calculation. It shows that the neural network has certain applicability in the calculation of excavation support system. Finally, the effect of excavation and support in practical engineering by manual digging pile is obvious, which can ensure the stability of excavation support system and guarantee the normal running of the excavation support system. The results of numerical simulation and engineering calculation are in good agreement with each other in the calculation of the internal force and deformation of the supporting pile, but the results of the numerical simulation are slightly smaller when analyzing the uplift of the pit bottom and the deformation of the surface. The better design scheme can be obtained by using two methods to calculate and synthesize the calculation results to carry on the design.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U449

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