【摘要】：隨著城市化進程的不斷發(fā)展,在軟土地區(qū)建設(shè)過程中對環(huán)境保護的要求越來越高,深基坑的開挖不僅需要考慮自身的安全和穩(wěn)定,還需要顧忌對周圍建筑物的影響。目前關(guān)于軟土地區(qū)基坑穩(wěn)定性控制已經(jīng)從強度控制發(fā)展到變形控制,并也逐漸將時間因素考慮在內(nèi)。為了更好的研究這方面的問題,引入蠕變理論,運用合適的彈粘塑性本構(gòu)模型對深基坑的土體變形進行研究,以求得到加入時間因素后土體變形特征。主要進行了以下幾方面的工作：(1)概括總結(jié)基坑變形中時間效應(yīng)的研究現(xiàn)狀,總結(jié)各種研究途徑和成果,深入分析各類工程問題中時間效應(yīng)的影響程度,為此方面的研究指明方向并提供依據(jù)。(2)在基坑的地質(zhì)概況、設(shè)計方案及該地區(qū)基坑工程的特點進行調(diào)查分析的基礎(chǔ)上,對實際監(jiān)測資料進行整理,同時基于時間效應(yīng)對結(jié)果進行分析和評價。(3)基于正交試驗參數(shù)反演將第一步開挖監(jiān)測的最大下沉值作為試驗指標(biāo),針對Kelvin粘滯系數(shù)、Kelvin切變模量兩個反演因素進行正交設(shè)計,通過對試驗結(jié)果進行分析,確定一組接近試驗指標(biāo)的土體力學(xué)參數(shù),并對其進行調(diào)整優(yōu)化,確定一組誤差相對較小的參數(shù)作為反演成果。(4)將圍護樁最大側(cè)向變形容許值作為安全控制指標(biāo),應(yīng)用有限差分法FLAC3D數(shù)值模擬軟件對實際工程進行數(shù)值模擬,并與現(xiàn)場實測數(shù)據(jù)進行對比分析。在定性分析的基礎(chǔ)上定量分析深基坑施工過程中正常開挖及時支撐和超挖這兩種情況下,基坑結(jié)構(gòu)隨時間的變化規(guī)律從而預(yù)測深基坑的安全放置時間。
[Abstract]:With the development of urbanization, the requirement of environmental protection is becoming higher and higher in the process of soft soil construction. The excavation of deep foundation pit not only needs to consider its own safety and stability, but also needs to worry about the influence of surrounding buildings. At present, stability control of foundation pit in soft soil area has developed from strength control to deformation control, and time factor has been gradually taken into account. In order to study this problem better, the creep theory is introduced, and the soil deformation of deep foundation pit is studied by using the suitable elasto-viscoplastic constitutive model, so as to obtain the deformation characteristics of soil after adding time factor. The main works are as follows: (1) summarize the research status of time effect in foundation pit deformation, sum up various research approaches and achievements, and analyze the influence degree of time effect in various engineering problems. The research in this area shows the direction and provides the basis. (2) on the basis of the geological survey, design scheme and the characteristics of the foundation pit engineering in this area, the actual monitoring data are sorted out. At the same time, the results are analyzed and evaluated based on the time effect. (3) based on the orthogonal test parameter inversion, the maximum subsidence value of the first step excavation monitoring is taken as the test index, and the orthogonal design is carried out for the two inversion factors of the Kelvin viscosity coefficient and the Kelvin shear modulus. Through the analysis of the test results, a group of soil mechanics parameters close to the test index are determined, and the parameters are adjusted and optimized. A set of parameters with relatively small error is determined as the inversion result. (4) taking the allowable maximum lateral deformation of the retaining pile as the safety control index, the numerical simulation software of finite difference method (FLAC3D) is used to simulate the actual engineering. And the field measured data are compared and analyzed. On the basis of qualitative analysis, the variation law of foundation pit structure with time during normal excavation and over-excavation is quantitatively analyzed, and the safe placing time of deep foundation pit is predicted.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU473

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