發(fā)布時(shí)間：2019-03-16 14:30

【摘要】：近年來,國(guó)內(nèi)外巖土工作者對(duì)基坑工程的研究取得了很多的優(yōu)秀成果,在基坑的設(shè)計(jì)、施工上也積累了許多可借鑒的經(jīng)驗(yàn)。隨著城市現(xiàn)代化的加速發(fā)展,城市的高層及地下建筑物不斷增加,隨之對(duì)基坑穩(wěn)定性及變形的要求也越來越高。特別是在沿海軟土地區(qū),需要采取有效的措施減少這種復(fù)雜的地質(zhì)條件對(duì)基坑穩(wěn)定性及變形的影響。在軟土地區(qū)一個(gè)很顯著的問題就是地下水的問題,在基坑開挖過程中當(dāng)開挖面在地下水位以下時(shí)需要進(jìn)行基坑降水,地下水水位的變化引發(fā)土體滲流場(chǎng)和應(yīng)力場(chǎng)的改變,且滲流場(chǎng)與應(yīng)力場(chǎng)的相互作用,會(huì)對(duì)基坑變形及圍護(hù)結(jié)構(gòu)內(nèi)力產(chǎn)生影響。因而,研究基坑滲流場(chǎng)與應(yīng)力場(chǎng)耦合作用具有重要的理論研究?jī)r(jià)值和工程應(yīng)用價(jià)值的。本文以軟土地區(qū)基坑工程為實(shí)例,分別采用MC模型、HS模型對(duì)其進(jìn)行有限元模擬,分析得到用HS模型得出的結(jié)果更接近于實(shí)際情況,所以在模擬軟土地區(qū)基坑開挖過程選用HS本構(gòu)模型較為適合。借助蘇州獅山科技館基坑工程實(shí)例對(duì)其降水開挖過程進(jìn)行數(shù)值模擬。結(jié)合滲流場(chǎng)、應(yīng)力場(chǎng)的耦合方程,利用數(shù)值軟件PLAXIS建立兩個(gè)基坑模型,一個(gè)是基于總應(yīng)力法不考慮水影響的模型,另一個(gè)是基于有效應(yīng)力法考慮基坑降水的流固耦合模型。對(duì)墻體位移、基底隆起值、地表沉降及墻體內(nèi)力值進(jìn)行對(duì)比分析,得出考慮耦合作用下的基坑變形及內(nèi)力均大于不考慮耦合作用的結(jié)果,且耦合作用下的基坑位移與實(shí)際監(jiān)測(cè)數(shù)據(jù)較接近,提出在軟土地區(qū)進(jìn)行基坑開挖降水需要考慮耦合作用的影響。同時(shí),分析了降水深度、嵌固深度對(duì)坑外土體沉降產(chǎn)生的影響,加大嵌固深度會(huì)減小坑外土體的沉降,降水深度的增加會(huì)加大坑外土體的沉降。
[Abstract]:In recent years, the research on the foundation pit engineering of the geotechnical workers at home and abroad has obtained many excellent results, and many valuable experiences have been accumulated in the design and construction of the foundation pit. With the rapid development of the city's modernization, the high-rise and underground structures of the city are increasing, and the requirements for the stability and deformation of the foundation pit are also higher and higher. In particular, in the coastal soft soil area, effective measures are needed to reduce the influence of such complicated geological conditions on the stability and deformation of the foundation pit. a very significant problem in the soft soil area is the problem of the underground water, when the excavation surface is below the ground water level during the excavation of the foundation pit, the dewatering of the foundation pit is required, the change of the water level of the underground water causes the change of the seepage field and the stress field of the soil body, and the interaction of the seepage field and the stress field, The deformation of the foundation pit and the internal force of the enclosing structure can be affected. Therefore, the study of the coupling between the seepage field and the stress field of the foundation pit is of great theoretical research value and engineering application value. In this paper, based on the case of the foundation pit in soft soil area, the MC model and the HS model are used to simulate the foundation pit in the soft soil area, and the results obtained by the HS model are closer to the actual conditions, so the HS constitutive model is suitable for the excavation of the foundation pit in the soft soil area. The numerical simulation of the precipitation excavation process is carried out with the help of the project of the foundation pit of Shishan Science and Technology Museum in Suzhou. Combined with the coupling equation of the seepage field and the stress field, two foundation pit models are established by the numerical software PLAXIS, one is the model which is based on the total stress method and does not consider the influence of water, and the other is a fluid-solid coupling model considering the dewatering of the foundation pit based on the effective stress method. The displacement of the wall, the uplift of the base, the surface settlement and the internal force of the wall are compared and analyzed, and the result that the deformation and internal force of the foundation pit under the coupling action is greater than that of the coupling action is not considered, and the displacement of the foundation pit under the coupling action is close to the actual monitoring data, It is suggested that the effect of coupling effect should be considered in the excavation and precipitation of foundation pit in soft soil area. At the same time, the influence of the depth of the precipitation and the depth of the embedded solid on the settlement of the soil in the outside of the pit is analyzed, the settlement of the soil outside the pit can be reduced, and the increase of the depth of the precipitation will increase the settlement of the soil outside the pit.
【學(xué)位授予單位】：石家莊經(jīng)濟(jì)學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU753

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