本文選題：地下工程　切入點：塌落拱　出處：《合肥工業(yè)大學》2015年碩士論文　論文類型：學位論文

【摘要】：地下工程開挖,尤其是城市地下空間開發(fā)利用,將引起地層沉降,硐頂形成塌落拱,地表建筑物受到不同程度破壞。為此,了解和掌握地下工程開挖硐頂塌落拱形態(tài)和地表沉降規(guī)律,對我國高速發(fā)展的地下工程建設具有重要的理論價值與工程指導意義。本文采用室內相似材料模型試驗、理論分析、數(shù)值實驗分析相結合的方法,對地下工程硐頂塌落拱三維形態(tài)演化規(guī)律和地表沉降規(guī)律展開研究。主要研究成果如下：(1)基于相似材料模型實驗,對不同開挖順序不同上覆地層厚度條件下的硐頂塌落拱形態(tài)的三維激光掃描圖像進行了數(shù)據(jù)分析,得出塌落拱范圍和拱高隨開挖面面積的增大而增大。(2)通過FLAC3D有限差分軟件對室內相似材料模型實驗進行補充和完善,得出開挖硐頂上覆地層沉降形態(tài)成拱狀,在開挖面正中心地表最終沉降值最大。利用等值超曲面重構硐頂塌落拱模型,分析了地下工程塌落拱上覆地層沉降規(guī)律,與相似實驗吻合。對節(jié)點最終沉降量處理,得出地表沉降最大值隨上覆地層厚度增大而減小,沉降影響區(qū)域(沉降槽寬度)隨著上覆地層厚度增大而增大。(3)發(fā)明了一種地下工程開挖硐頂塌落拱形態(tài)三維激光掃描簡易裝置,可快速建立硐室三維空間形態(tài)模型,實現(xiàn)了在不接觸不擾動工程實體的情況下,對硐室、巷道、容腔、采空區(qū)等進行空間形態(tài)三維激光掃描和工程變形量測與監(jiān)控掃描,優(yōu)化和減少了數(shù)據(jù)采集密度,操作簡單,價格低廉,攜帶方便。
[Abstract]:The excavation of underground engineering, especially the exploitation and utilization of urban underground space, will cause ground subsidence, collapse arch on the top of the cave and destruction of surface buildings to varying degrees. It is of great theoretical value and engineering significance to understand and master the shape of caving arch and the law of ground subsidence in underground engineering excavation, which is of great theoretical value and engineering guidance for the high-speed development of underground engineering in China. Based on the numerical experimental analysis, the three dimensional morphological evolution law and the surface subsidence law of caving arch in underground engineering are studied. The main results are as follows: 1) based on the similar material model experiment, The 3D laser scanning images of caving arch with different excavation sequence and overlying stratum thickness are analyzed. It is concluded that the area and height of caving arch increase with the increase of excavated surface area. (2) the indoor similar material model experiment is supplemented and perfected by FLAC3D finite difference software, and the settlement of the overlying stratum on the top of the excavation is found to be arched. The final settlement value of the surface at the center of the excavated surface is the largest. By using the equivalent hypersurface reconstruction of the roof collapse arch model, the settlement law of the overlying stratum of the collapse arch of underground engineering is analyzed, which is consistent with the similar experiment, and the final settlement of the node is treated. It is concluded that the maximum surface subsidence decreases with the increase of overlying strata thickness. The settlement affected area (the width of settlement groove) increases with the thickness of the overlying stratum. A simple 3D laser scanning device for underground engineering excavation cavern collapse arch shape is invented, which can quickly establish the three-dimensional spatial shape model of the chamber. In the case of no contact with undisturbed engineering entity, 3D laser scanning of space morphology and monitoring and monitoring of engineering deformation are realized for chamber, roadway, cavity and goaf. The data acquisition density is optimized and reduced, and the operation is simple. Low price, easy to carry.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU94;TU433

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本文編號：1590814