本文選題：地連墻 + 現(xiàn)場(chǎng)實(shí)測(cè)　； 參考：《天津大學(xué)》2014年碩士論文

【摘要】：隨著人口密度加大,城市不斷興建和發(fā)展,大規(guī)模的高層建筑、地下空間建設(shè)正在進(jìn)行�；由疃取⒁�(guī)模、難度的快速發(fā)展給設(shè)計(jì)、施工都帶來了嚴(yán)峻的挑戰(zhàn)。加之近些年來,基坑工程事故頻發(fā),需要對(duì)基坑施工的全過程給予更加細(xì)致、全面的研究。當(dāng)基坑施工引起的變形需要嚴(yán)格控制時(shí),常常采用剛度大、整體性較好的地下連續(xù)墻作為圍護(hù)結(jié)構(gòu)。過去在工程設(shè)計(jì)時(shí)一般不考慮基坑圍護(hù)結(jié)構(gòu)施工引起的土體位移,認(rèn)為在地連墻施工期間,土體沒有較明顯的變化。然而很多工程實(shí)例表明圍護(hù)結(jié)構(gòu)施工可引起可觀的土體變形。本文以地連墻施工為例,分析了圍護(hù)結(jié)構(gòu)施工引起的土體變化。以天津地區(qū)嘉海一期基坑工程的地連墻施工過程為監(jiān)測(cè)對(duì)象,監(jiān)測(cè)歷時(shí)近10個(gè)月。在嘉海一期基坑南側(cè)布置了4個(gè)監(jiān)測(cè)斷面,每個(gè)斷面設(shè)置有測(cè)斜管、孔隙水壓力測(cè)管等不同功能的孔位。實(shí)測(cè)結(jié)果表明地連墻施工對(duì)土體測(cè)斜值、孔隙水壓力都有明顯影響。地連墻施工完成后,坑外土體位移均遠(yuǎn)離地連墻方向,這主要是由于天津地區(qū)土體側(cè)壓力系數(shù)值較小(小于1)。對(duì)于地下連續(xù)墻施工過程中孔隙水壓力,開挖成槽階段,表現(xiàn)為卸荷效應(yīng)占主導(dǎo),槽段周圍土體孔隙水壓力有所下降。而灌注混凝土階段,加載效應(yīng)顯著,土體孔隙水壓力有所上升。采用三維有限元數(shù)值模擬地連墻施工,結(jié)果與現(xiàn)場(chǎng)實(shí)測(cè)數(shù)據(jù)擬合良好。并進(jìn)一步分析攪拌樁隔離墻(是否存在、不同嵌固深度)、地表建筑物(不同荷載、不同距離)以及兩種情況綜合作用工況下,地連墻施工引起的土體變形。根據(jù)明德林(Mindlin)解推導(dǎo)地連墻施工引起土體水平位移的彈性數(shù)值解,土體的變量為泊松比和彈性模量,地連墻則主要考慮不同墻深。給出工程常見土層和地連墻工況下的數(shù)值解表格,便于實(shí)際工程應(yīng)用。
[Abstract]:With the increase of population density and the continuous construction and development of cities, large-scale high-rise buildings and underground space are being constructed.The rapid development of foundation pit depth, scale and difficulty brings severe challenges to design and construction.In addition, in recent years, the foundation pit engineering accidents occur frequently, need to give a more detailed and comprehensive study on the whole process of foundation pit construction.When the deformation caused by foundation pit construction needs to be strictly controlled, the underground continuous wall with high stiffness and good integrity is often used as the retaining structure.In the past, the displacement of soil caused by the construction of retaining structure of foundation pit was generally not considered in the engineering design, and it was considered that there was no obvious change of soil mass during the construction of the ground connecting wall.However, many engineering examples show that the construction of retaining structure can cause considerable deformation of soil.In this paper, the soil mass change caused by the construction of the retaining structure is analyzed by taking the construction of the ground-connected wall as an example.Taking the construction process of the ground connection wall of the first stage foundation pit project in Tianjin area as the monitoring object, the monitoring lasted nearly 10 months.Four monitoring sections are arranged on the south side of Jiahai first stage foundation pit, each section is equipped with hole positions with different functions, such as inclined pipe and pore water pressure measuring pipe.The measured results show that the construction of the ground connecting wall has a significant effect on the slope value and pore water pressure of the soil.After the construction of the connecting wall, the displacement of the soil outside the pit is far away from the direction of the wall, which is mainly due to the fact that the coefficient of lateral pressure of the soil in Tianjin area is smaller (less than 1%).For the pore water pressure of underground continuous wall during the construction process, in the stage of trench excavation, the unloading effect dominates, and the pore water pressure of soil around the slot section decreases.However, in the stage of pouring concrete, the loading effect is obvious, and the pore water pressure of soil is increased.The three dimensional finite element method is used to simulate the construction of the ground connecting wall, and the results fit well with the field measured data.Furthermore, the soil deformation caused by the wall of mixing piles (existence or not, different embedded depth, surface buildings (different loads, different distances) and the combined action of two conditions are analyzed.According to Mindlin's solution, the elastic numerical solution of horizontal displacement caused by the construction of the ground connecting wall is derived. The variables of the soil are Poisson's ratio and elastic modulus, while the connecting wall's depth is mainly considered.The numerical solution table of the common soil layer and the ground-connected wall is given, which is convenient for practical engineering application.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU753

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