【摘要】：自中國改革開放至今,城市化建設(shè)在迅速發(fā)展中,人口量快速增長,使人們對(duì)生活空間的需求量增大,從過去的平房到現(xiàn)在的高層、超高層建筑,不僅建筑物的高度在不斷增加而且建筑物的規(guī)模也越來越大。為了不影響城市規(guī)劃,人們開始向開發(fā)和利用地下空間發(fā)展,因此深基坑工程的發(fā)展也成為一個(gè)熱點(diǎn)的課題�；庸こ痰氖┕ど婕暗胶芏喾矫�,像工程地質(zhì)條件、基坑支護(hù)形式和區(qū)域內(nèi)土體力學(xué)狀態(tài)都是影響基坑工程安全施工的因素,深基坑工程涉及面如此廣泛使它具有復(fù)雜性、區(qū)域性和風(fēng)險(xiǎn)性的特點(diǎn),如果一個(gè)基坑工程發(fā)生了事故會(huì)造成不可估計(jì)的后果。使每個(gè)基坑工程能夠選擇一個(gè)正確的支護(hù)形式和支護(hù)設(shè)計(jì)方案是保證基坑工程施工安全的關(guān)鍵。由于基坑在施工過程中不可預(yù)見性很高,所以為了隨時(shí)掌握基坑開挖過程中的變形情況,進(jìn)行施工現(xiàn)場(chǎng)監(jiān)測(cè)是必不可少的一部分。本文以阜新市全科醫(yī)生臨床培養(yǎng)基地的基坑工程為研究背景,通過理正基坑軟件的計(jì)算結(jié)果、施工現(xiàn)場(chǎng)監(jiān)測(cè)和數(shù)值模擬對(duì)基坑變形機(jī)理、樁錨支護(hù)特點(diǎn)等進(jìn)行分析,主要包括以下內(nèi)容：(1)列舉了現(xiàn)階段基坑支護(hù)的類型,總結(jié)了基坑變形機(jī)理,包括坑底隆起變形、坑外地表沉降和圍護(hù)結(jié)構(gòu)變形等三部分,并分析了基坑變形因素及其預(yù)防措施。闡述了基坑土壓力理論和支護(hù)結(jié)構(gòu)的靜力計(jì)算。(2)結(jié)合巖土工程勘察資料和實(shí)際工程場(chǎng)地條件,運(yùn)用理正深基坑軟件對(duì)剖面二進(jìn)行基坑支護(hù)設(shè)計(jì)計(jì)算,取得了基坑的內(nèi)力與位移、土體的沉降位移、支護(hù)結(jié)構(gòu)的配筋和基坑整體穩(wěn)定性分析等。確定支護(hù)方案后,按照工程場(chǎng)地特點(diǎn)和規(guī)范要求進(jìn)行基坑監(jiān)測(cè)工作的布置,主要監(jiān)測(cè)基坑土體水平位移、基坑周邊地表沉降和錨索軸力等,獲取監(jiān)測(cè)結(jié)果,完成監(jiān)測(cè)工作。(3)本文運(yùn)用ADINA軟件,對(duì)本基坑開挖過程進(jìn)行了二維模擬,模擬了基坑開挖過程中周邊地表沉降、基坑土體水平位移和錨索軸力,并取得了模擬結(jié)果并對(duì)其進(jìn)行總結(jié)分析。(4)最后,將理正軟件的計(jì)算值、現(xiàn)場(chǎng)監(jiān)測(cè)值和ADINA數(shù)值模擬值進(jìn)行對(duì)比分析,發(fā)現(xiàn)三者得到的結(jié)果基本保持一致,這說明理正深基坑支護(hù)軟件的設(shè)計(jì)計(jì)算是可行的,數(shù)值模擬的建模和參數(shù)選擇是正確的。為深基坑工程研究提供參考,保證了實(shí)際基坑工程施工的安全性,優(yōu)化基坑設(shè)計(jì)方案。
[Abstract]:Since China's reform and opening up to the present, urbanization has been developing rapidly, and the population has grown rapidly, which has increased the demand for living space, from the past bungalows to the high-rise and super-high-rise buildings. Not only is the height of the building increasing, but the size of the building is also growing. In order not to affect urban planning, people began to develop and utilize underground space, so the development of deep foundation pit engineering has become a hot topic. The construction of foundation pit works involves many aspects, such as engineering geological conditions, the form of foundation pit support and the mechanical state of soil in the region are the factors that affect the safe construction of foundation pit engineering. Regional and risk characteristics, if an accident occurs in a foundation pit project, it will cause incalculable consequences. It is the key to ensure the construction safety of foundation pit engineering to select a correct supporting form and support design scheme for each foundation pit project. Because the foundation pit is unpredictable in the construction process, in order to grasp the deformation of the excavation process at any time, the construction site monitoring is an essential part. In this paper, based on the foundation pit engineering of clinical training base of general practitioners in Fuxin City, the deformation mechanism of foundation pit and the characteristics of pile and anchor support are analyzed through the calculation results of foundation pit software, site monitoring and numerical simulation. The main contents are as follows: (1) the types of foundation pit support at the present stage are listed, and the deformation mechanism of foundation pit is summarized, which includes three parts: the uplift deformation of pit bottom, the settlement of surface of pit and the deformation of enclosure structure. The deformation factors of foundation pit and its preventive measures are also analyzed. The earth pressure theory of foundation pit and the static calculation of supporting structure are expounded. (2) combined with geotechnical engineering survey data and actual engineering site conditions, the design and calculation of foundation pit support for section 2 are carried out by using the software of Lizheng deep foundation pit. The internal force and displacement of foundation pit, the settlement displacement of soil, the reinforcement of supporting structure and the whole stability analysis of foundation pit are obtained. After the supporting scheme is determined, the layout of foundation pit monitoring work is carried out according to the characteristics of the engineering site and the requirements of the specifications. The monitoring results are obtained by mainly monitoring the horizontal displacement of the foundation pit soil, the ground subsidence around the foundation pit and the axial force of the anchor cable, etc. (3) in this paper, the excavation process of the foundation pit is simulated by using ADINA software, which simulates the ground subsidence around the foundation pit, the horizontal displacement of soil and the axial force of anchor cable. The simulation results are obtained and analyzed. (4) finally, the calculated values of the software, the field monitoring values and the numerical simulation values of ADINA are compared and analyzed, and it is found that the results obtained by the three methods are basically the same. This shows that the design and calculation of Lizheng deep foundation pit support software is feasible, and the modeling and parameter selection of numerical simulation are correct. It provides a reference for the research of deep foundation pit engineering, ensures the safety of actual foundation pit construction, and optimizes the foundation pit design scheme.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【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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