發(fā)布時間：2018-10-17 11:14

【摘要】：隨著我國國民經(jīng)濟的迅速發(fā)展,城市建設(shè)步伐的加快,僅對地上空間的開發(fā)利用已經(jīng)不能滿足現(xiàn)有的設(shè)施需要,同時,由于高層建筑、地下停車場及地下管線等公共設(shè)施的大規(guī)模興建,城市用地日趨緊張。因此,很多新建工程都處于城市的繁華地段,基坑周邊建筑物、重要的城市道路及地下管線密集,隨之而來的出現(xiàn)了很多深基坑設(shè)計和施工問題,如基坑支護結(jié)構(gòu)的變形及穩(wěn)定、基坑開挖對周邊環(huán)境的影響、基坑內(nèi)外部地下水的控制以及基坑監(jiān)測等問題。因此,對基坑工程的穩(wěn)定性問題的研究成為了巖土工程界急需解決的關(guān)鍵問題。土巖結(jié)合基坑與巖體或者土質(zhì)基坑有很大的差異,現(xiàn)在國內(nèi)外尚無比較成熟的計算方法,其理論研究遠遠落后于工程實踐,并且現(xiàn)有的研究成果中針對衡陽紅砂巖地區(qū)土巖基坑工程的變形并沒有特別詳細的論證,使得很多工程沒有經(jīng)驗可循。本文以衡陽地區(qū)某一土巖結(jié)合基坑為依托,采用理論分析及現(xiàn)場實測的方法,分析研究了該基坑的變形規(guī)律,主要內(nèi)容如下:(1)詳細闡述了目前深基坑、土巖結(jié)合基坑以及土巖結(jié)合基坑設(shè)計和監(jiān)測的研究現(xiàn)狀及存在問題;(2)采用經(jīng)實踐證明的比較經(jīng)濟合理的土巖結(jié)合基坑幾種支護方式、設(shè)計計算方法及穩(wěn)定性分析方法,分析土巖結(jié)合基坑的變形模式,闡述影響其變形的主要因素及其與土質(zhì)基坑影響因素的異同,并對如何保證基坑質(zhì)量提出了幾點建議。(3)詳細介紹了本基坑的監(jiān)測方法、監(jiān)測點布設(shè)情況,并針對每一不同分段的監(jiān)測點進行分別布置,通過合理布設(shè)監(jiān)測點,研究如何保證監(jiān)測質(zhì)量的可靠、合理。把監(jiān)測得到的數(shù)據(jù)進行科學分析,特別針對坡頂水平及豎向位移、深層土體水平位移、周邊建筑物沉降及錨索拉力的分析,掌握施工過程中各監(jiān)測元件的變形規(guī)律,及時做出調(diào)整,使基坑工程順利進行。(4)通過對監(jiān)測數(shù)據(jù)的分析,驗證了所設(shè)計的支護結(jié)構(gòu)的合理性、安全性;研究得出土巖結(jié)合基坑變形規(guī)律,通過對每一支護分段交叉對比分析,發(fā)現(xiàn)其與土質(zhì)基坑的不同之處,以及影響基坑變形的因素。為類似基坑的設(shè)計和施工提供依據(jù)。
[Abstract]:With the rapid development of our national economy and the acceleration of urban construction, the development and utilization of aboveground space can no longer meet the needs of existing facilities. At the same time, due to high-rise buildings, With the construction of underground car parks and underground pipelines and other public facilities, urban land is becoming increasingly tight. Therefore, many new projects are located in the bustling parts of the city, the buildings around the foundation pit, the important urban roads and underground pipelines are dense, and a lot of problems in the design and construction of deep foundation pit appear. For example, the deformation and stability of foundation pit support structure, the influence of excavation on the surrounding environment, the control of underground water inside and outside the foundation pit and the monitoring of foundation pit, etc. Therefore, the research on the stability of foundation pit engineering has become a key problem that needs to be solved in geotechnical engineering field. The soil-rock combined foundation pit is very different from the rock mass or soil foundation pit. There is no mature calculation method at home and abroad, and its theoretical research lags far behind the engineering practice. And the existing research results in Hengyang Red Sandstone area soil and rock foundation pit deformation is not particularly detailed argument, so that many projects have no experience to follow. Based on a soil-rock combined foundation pit in Hengyang area, the deformation law of the foundation pit is analyzed and studied by the method of theoretical analysis and field measurement. The main contents are as follows: (1) the deep foundation pit at present is described in detail. The present situation and existing problems in the design and monitoring of soil-rock combined foundation pit and soil-rock combined foundation pit are discussed. (2) the design calculation method and the stability analysis method are adopted, which are proved to be more economical and reasonable in practice. This paper analyzes the deformation mode of soil-rock combined foundation pit, expounds the main factors affecting its deformation and its similarities and differences with that of soil foundation pit, and puts forward some suggestions on how to ensure the foundation pit quality. (3) the monitoring method of this foundation pit is introduced in detail. The monitoring points are arranged separately according to the monitoring points in different sections, and how to ensure the reliability and reasonableness of the monitoring quality is studied by setting up the monitoring points reasonably. The monitoring data are analyzed scientifically, especially for the horizontal and vertical displacement of slope top, the horizontal displacement of deep soil, the settlement of surrounding buildings and the tension of anchor cable, so as to master the deformation law of each monitoring element in the construction process. Timely adjustment is made to make the foundation pit project proceed smoothly. (4) through the analysis of monitoring data, the rationality and safety of the designed supporting structure are verified, and the deformation law of excavated rock combined with foundation pit is studied. Based on the comparative analysis of each support section, it is found that the foundation pit is different from the soil foundation pit, and the factors that affect the deformation of the foundation pit are also found. It provides the basis for the design and construction of similar foundation pit.
【學位授予單位】：南華大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU753

【參考文獻】

相關(guān)期刊論文 前1條

1 劉紅軍;李東;孫濤;劉小麗;;二元結(jié)構(gòu)巖土基坑“吊腳樁”支護設(shè)計數(shù)值分析[J];土木建筑與環(huán)境工程;2009年05期

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本文編號：2276475