本文選題：基坑開挖　切入點(diǎn)：地下水　出處：《南昌航空大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：在高地下水位地區(qū)進(jìn)行基坑開挖時(shí),為降低地下水位對(duì)基坑穩(wěn)定性的影響,常需進(jìn)行基坑降水施工,由于基坑降水會(huì)誘發(fā)土體的固結(jié)變形,進(jìn)而對(duì)臨近建筑物的安全狀態(tài)產(chǎn)生不利的影響。對(duì)此,本文設(shè)計(jì)了一種防滲水基坑支護(hù)結(jié)構(gòu),通過(guò)室內(nèi)試驗(yàn)和仿真分析相結(jié)合的方法,對(duì)設(shè)計(jì)結(jié)構(gòu)性能及影響因素進(jìn)行分析,主要得到以下研究成果:(1)針對(duì)基坑降水誘發(fā)土體變形問(wèn)題,本文設(shè)計(jì)了一種防滲水基坑支護(hù)結(jié)構(gòu),該結(jié)構(gòu)在基坑側(cè)壁設(shè)置豎向截水層,在基坑底部設(shè)置坑底截水層,形成三維密封的防滲體系,從結(jié)構(gòu)特點(diǎn)及受力機(jī)理來(lái)看,該結(jié)構(gòu)可以有效的阻斷地下水的滲透路徑,減小基坑外側(cè)土體的變形。(2)根據(jù)所提出的防滲水基坑支護(hù)結(jié)構(gòu),開展室內(nèi)模型試驗(yàn),對(duì)基坑外不排水開挖和基坑外排水開挖兩種工況下,土體變形、支護(hù)結(jié)構(gòu)變形和支護(hù)結(jié)構(gòu)應(yīng)力進(jìn)行測(cè)試,從測(cè)試結(jié)果來(lái)看,兩種工況下土體位移、支護(hù)結(jié)構(gòu)位移與支護(hù)結(jié)構(gòu)的應(yīng)力存在一定的差異。從影響幅度來(lái)看,基坑外不排水開挖相對(duì)于基坑外排水開挖,土體豎向位移減小了約50%;土體水平位移減小了約20.3%;支護(hù)結(jié)構(gòu)的位移增大了約20%;支護(hù)結(jié)構(gòu)的應(yīng)力增大了約25%。(3)根據(jù)設(shè)計(jì)結(jié)構(gòu)性能仿真分析結(jié)果,發(fā)現(xiàn)各因素改變都會(huì)對(duì)支護(hù)結(jié)構(gòu)性能和周邊土體變形產(chǎn)生影響。從對(duì)支護(hù)結(jié)構(gòu)性能影響來(lái)看,支護(hù)結(jié)構(gòu)高度和支護(hù)結(jié)構(gòu)剛度對(duì)支護(hù)結(jié)構(gòu)性能影響較大,水頭差和墻背土性對(duì)支護(hù)結(jié)構(gòu)性能影響較小。從對(duì)基坑周邊土體變形影響來(lái)看,水頭差對(duì)土體變形影響較大,支護(hù)結(jié)構(gòu)高度和支護(hù)結(jié)構(gòu)剛度對(duì)土體變形影響較小。
[Abstract]:In order to reduce the influence of groundwater level on the stability of foundation pit during excavation in high groundwater level area, it is often necessary to carry out foundation pit dewatering construction, because foundation pit dewatering will induce consolidation deformation of soil. In this paper, a kind of seepage proof foundation pit supporting structure is designed. Through the combination of indoor test and simulation analysis, the performance of the design structure and its influencing factors are analyzed. In order to solve the problem of soil deformation induced by dewatering of foundation pit, this paper designs a kind of impervious foundation pit supporting structure. The structure has vertical water intercepting layer on the side wall of foundation pit, and bottom water intercepting layer on the bottom of foundation pit. According to the structure characteristics and mechanical mechanism, the structure can effectively block the seepage path of groundwater and reduce the deformation of soil outside the foundation pit. The indoor model test was carried out to test the soil deformation, support structure deformation and support structure stress under the two conditions of undrained excavation outside the foundation pit and drainage excavation outside the foundation pit. From the test results, the displacement of the soil under the two working conditions was analyzed. There are some differences between displacement of supporting structure and stress of supporting structure. In terms of influence range, undrained excavation outside foundation pit is relative to drainage excavation outside foundation pit. The vertical displacement of the soil is reduced by about 50 percent; the horizontal displacement of the soil is reduced by about 20.3; the displacement of the supporting structure is increased by about 20; the stress of the supporting structure is increased by about 25.3; It is found that the change of various factors will affect the performance of the supporting structure and the deformation of surrounding soil, and the height of the supporting structure and the stiffness of the supporting structure will have a great effect on the performance of the supporting structure. The difference of water head and the soil property of the back of the wall have little influence on the performance of the supporting structure. From the effect on the deformation of the soil around the foundation pit, the difference of the water head has a great influence on the deformation of the soil, and the height of the supporting structure and the stiffness of the supporting structure have little effect on the deformation of the soil.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU753

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