【摘要】：摘要：深基坑支護設(shè)計是當(dāng)前高層建筑設(shè)計施工中存在的難題,設(shè)計方案是否科學(xué)合理,直接關(guān)系到工程的質(zhì)量、進度、經(jīng)濟效益和安全。它也是個復(fù)雜的綜合性巖土工程問題,涉及到工程周邊環(huán)境、場地地層特性和巖土力學(xué)參數(shù),同時還有土與支護結(jié)構(gòu)之間的共同作用。 論文對各種基坑支護結(jié)構(gòu)設(shè)計應(yīng)遵守的原則,承載能力極限狀態(tài)和正常使用狀態(tài)下必須滿足的各種條件進行了探討；同時結(jié)合實例對設(shè)計數(shù)據(jù)進行相應(yīng)的驗算,包括基坑穩(wěn)定性、周邊環(huán)境及支護結(jié)構(gòu)變形、抗?jié)B透穩(wěn)定性、抗隆起及基坑底突涌穩(wěn)定性驗算等。 樁錨支護設(shè)計主要的方法有常規(guī)設(shè)計法、彈性抗力法以及數(shù)值分析方法等。本文對這些方法的理論基礎(chǔ)進行了探討,對各種方法存在的問題進行了分析；并結(jié)合基坑工程實例和相關(guān)規(guī)范,采用前兩種方法探討了樁錨設(shè)計的設(shè)計方法和計算過程。 (1)探討了深基坑土壓力的七種理論,并對樁錨支護設(shè)計體系中的土壓力計算進行了詳細(xì)的推導(dǎo)。 (2)對深基坑樁錨支護結(jié)構(gòu)選型及結(jié)構(gòu)體系進行了研究,包括支護結(jié)構(gòu)水平荷載與水平抗力的計算、懸臂式支護結(jié)構(gòu)計算、多支點支護結(jié)構(gòu)計算、結(jié)構(gòu)內(nèi)力及截面承載力計算和錨桿計算等。 (3)通過詳細(xì)論述這種支護體系的工作機理并進行力學(xué)分析闡明該支護結(jié)構(gòu)的力學(xué)特性和優(yōu)點。 (4)采用經(jīng)典法進行結(jié)構(gòu)內(nèi)力、變形及支點力設(shè)計計算,并根據(jù)規(guī)范要求進行相應(yīng)的穩(wěn)定性驗算。 (5)結(jié)合某深基坑支護工程實例,設(shè)計采用樁錨支護結(jié)構(gòu),布置合理的工程排水系統(tǒng)和監(jiān)測系統(tǒng),實際結(jié)果證明,這些措施的實施保證了基坑支護工程施工的順利進行。 (6)通過從理論研究到工程實例設(shè)計,總結(jié)了樁錨支護的優(yōu)缺點,明確了該支護方法的適用條件,對同類工程支護方法的選擇和設(shè)計在經(jīng)驗和技術(shù)上具有一定的指導(dǎo)作用。圖21幅,表6個,參考文獻67篇
[Abstract]:Abstract: the supporting design of deep foundation pit is a difficult problem existing in the design and construction of high-rise building at present, whether the design scheme is scientific or not is directly related to the quality, progress, economic benefit and safety of the project. It is also a complex and comprehensive geotechnical engineering problem, which involves the surrounding environment of the project, ground characteristics and geotechnical mechanical parameters, as well as the interaction between soil and supporting structure. In this paper, the principles that should be obeyed in the design of various foundation pit supporting structures, the limit state of bearing capacity and the various conditions which must be satisfied under normal service condition are discussed. At the same time, the design data are checked with examples, including the stability of foundation pit, the deformation of surrounding environment and supporting structure, the stability of anti-seepage, the stability of anti-uplift and the stability of bottom inrush of foundation pit, and so on. The main methods of pile-anchor support design include conventional design method, elastic resistance method and numerical analysis method. In this paper, the theoretical basis of these methods is discussed, the existing problems of various methods are analyzed, and the design method and calculation process of pile-anchor design are discussed by using the first two methods, combined with the examples of foundation pit engineering and relevant codes. The main results are as follows: (1) the seven theories of earth pressure in deep foundation pit are discussed, and the calculation of soil pressure in the design system of pile-anchor support is deduced in detail. (2) the selection of pile-anchor supporting structure and structure system of deep foundation pit are studied, including the calculation of horizontal load and horizontal resistance of supporting structure, the calculation of cantilever support structure, the calculation of multi-support structure, and the calculation of pile-anchor supporting structure of deep foundation pit. The calculation of internal force and cross-section bearing capacity of the structure and the calculation of anchor rod etc. (3) the working mechanism of this support system is discussed in detail, and the mechanical characteristics and advantages of the supporting structure are explained by mechanical analysis. (4) the design and calculation of internal force, deformation and fulcrum force of the structure are carried out by classical method, and the corresponding stability calculation is carried out according to the requirements of the code. (5) combined with an example of a deep foundation pit supporting project, the pile-anchor supporting structure is designed and a reasonable drainage system and monitoring system are arranged. The practical results show that the implementation of these measures ensures the smooth construction of the foundation pit supporting project. (6) through the theoretical research to the design of engineering examples, the advantages and disadvantages of pile-anchor support are summarized, and the applicable conditions of the supporting method are defined, which can guide the selection and design of similar engineering support methods in experience and technology to a certain extent. 21 figures, 6 tables, 67 references
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU473.2

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