220kV變電站樁基礎(chǔ)設(shè)計(jì)畢業(yè)設(shè)計(jì)


220kV變電站樁基礎(chǔ)設(shè)計(jì)
摘    要
　　　變電站上部結(jié)構(gòu)為變電室和生產(chǎn)樓等結(jié)構(gòu)，而下部結(jié)構(gòu)為基礎(chǔ)，包括天然地基基礎(chǔ)和樁基礎(chǔ)。基礎(chǔ)工程包括建筑物的地基與基礎(chǔ)的設(shè)計(jì)與施工。為了保證風(fēng)電場(chǎng)的正常使用與安全，地基與基礎(chǔ)必須具有足夠的強(qiáng)度和穩(wěn)定性，變形也應(yīng)在允許范圍之內(nèi)。根據(jù)地層變化情況、上部結(jié)構(gòu)的要求、荷載特點(diǎn)和施工技術(shù)水平，可采用不同類(lèi)型的地基和基礎(chǔ)。
　　　本文以江蘇東臺(tái)風(fēng)電場(chǎng)220kV變電站基礎(chǔ)設(shè)計(jì)為例，依據(jù)中國(guó)水電工程顧問(wèn)集團(tuán)華東勘測(cè)設(shè)計(jì)研究院提供的勘查報(bào)告，深入了解了工程建筑區(qū)的地形地貌、地質(zhì)構(gòu)造、水文地質(zhì)條件、巖土力學(xué)性質(zhì)和物理地質(zhì)現(xiàn)象等工程地質(zhì)條件，對(duì)擬建工程場(chǎng)區(qū)進(jìn)行評(píng)價(jià)，并提出巖土力學(xué)指標(biāo)的建議值和該變電站樁基礎(chǔ)設(shè)計(jì)。
　　　首先根據(jù)工程地質(zhì)條件、巖土力學(xué)指標(biāo)建議值和上部結(jié)構(gòu)形式及上部結(jié)構(gòu)重量，選取了樁基礎(chǔ)形式——混凝土預(yù)應(yīng)力管樁。在對(duì)天然地基的評(píng)價(jià)的基礎(chǔ)上，進(jìn)行了成樁分析。根據(jù)混凝土預(yù)應(yīng)力管樁的優(yōu)缺點(diǎn)，結(jié)合場(chǎng)地地層條件，初步選取樁徑，試算出樁長(zhǎng)，并進(jìn)行樁的設(shè)計(jì)計(jì)算：?jiǎn)螛冻休d力和樁的沉降計(jì)算，最后從抗剪、沖切和抗彎等三方面對(duì)承臺(tái)進(jìn)行了設(shè)計(jì)驗(yàn)算。
關(guān)鍵詞: 變電站；地基；預(yù)應(yīng)力管樁；沉降；承臺(tái)
　　　　　　　　　　　　　　　　　

Abstract
　　　The superstructure for the Substation is buildings for producing electriction, and its substructure is foundation which include natural foundation and the pile foundation. Infrastructure projects s include the design and construction for the foundation of the building. In order to ensure the normal use and security for the Substation, foundations must have adequate strength and stability, deformation should also be in allowing scope. According to the formation,s change, the upper structure, the load characteristics and the construction skills, using different types of foundations .
　　　 This paper is mainly about 220 kV substation foundation design as an example, based on China's hydropower engineering consultancy group of East China Survey and Design Institute of the investigation reports, in-depth understanding the engineering geological conditions of the engineering geological sites such as architectural landscape, geological structure hydrogeology conditions, the physical and mechanical properties of the soil and the physical phenomena. eva luates the proposed project sites, renders the proposed indicators of the rock mechanics and selection and the pile foundation design.  .
　　　First according to geological conditions, rock mechanics and the upper structure of the proposed form and structure of the upper weight, select a pile foundation forms - Prestressed Concrete Piles.On the basis of the eva luation of the natural foundation , analysis of the pile. According to the advantages and disadvantages of the Prestressed Concrete Piles, the formation conditions of venues, select the initial pile diameter and try to work out a length of the pile, and  do design for piles and do the calculation: piles and pile bearing capacity of the settlement terms, the last from the shear, punching and Bending, and other constituents for the cap of buildings to face the design checking.
Key Words :  Substation；Foundation；Prestressed  Concrete  Piles； Settlement；Cap of buildings
目錄
1  前言 1
2  工程概況 2
2.1  工程簡(jiǎn)介及勘察任務(wù) 2
2.1.1  工程概述 2
2.1.2  勘察目的任務(wù) 2
2.1.3  工作依據(jù) 2
2.2  勘察等級(jí)劃分 3
2.2.1  安全等級(jí) 3
2.2.2  場(chǎng)地等級(jí) 3
2.2.3  地基等級(jí) 4
2.2.4  勘察等級(jí) 5
2.3  勘探孔的布置 5
2.3.1  勘探孔布置情況 5
2.3.2  勘察手段和完成工作量 6
3  工程地質(zhì)及水文地質(zhì)條件 8
3.1  工程地質(zhì)條件 8
3.1.1  區(qū)域地質(zhì)與地形地貌 8
3.1.2  地基土的構(gòu)成與特征 8
3.2  場(chǎng)地地基土的物理力學(xué)性質(zhì) 9
3.3  水文地質(zhì)條件與水的腐蝕性評(píng)價(jià) 10
3.3.1  水文地質(zhì) 10
3.3.2  水質(zhì)分析 11
3.3.3  水的腐蝕性分析評(píng)價(jià) 11
4  場(chǎng)地巖土工程評(píng)價(jià)與樁基條件分析 13
4.1  場(chǎng)地類(lèi)別及抗震地段劃分 13
4.1.1  場(chǎng)地類(lèi)別劃分 13
4.1.2  抗震地段劃分 13
4.2 本場(chǎng)地飽和砂土液化類(lèi)別 13
4.3  天然地基評(píng)價(jià) 15
4.3.1  場(chǎng)地穩(wěn)定性及適宜性評(píng)價(jià) 15
4.3.2  建筑結(jié)構(gòu)荷載及基底壓力估算 15
4.3.3  持力層選擇 16
4.3.4  天然地基承載力評(píng)價(jià) 17
4.4  樁基條件分析評(píng)價(jià) 18
4.4.1  樁持力層與樁型選擇 18
4.4.2  成樁可能性分析 19
4.4.3  樁基沉降分析 19
5  混凝土預(yù)應(yīng)力管樁設(shè)計(jì) 20
5.1  混凝土預(yù)應(yīng)力管樁簡(jiǎn)介 20
5.1.1  管樁的優(yōu)點(diǎn) 20
5.1.2  管樁的缺點(diǎn)及局限 20
5.2  混凝土預(yù)應(yīng)力管樁的設(shè)計(jì) 21
5.2.1  持力層選擇 21
5.2.2  混凝土預(yù)應(yīng)力管樁的設(shè)計(jì) 22
5.3  四樁承臺(tái)的設(shè)計(jì)驗(yàn)算 28
5.3.1  抗剪計(jì)算 28
5.3.2  沖切計(jì)算 29
5.3.3  抗彎計(jì)算 30
5.4  六樁承臺(tái)的設(shè)計(jì)驗(yàn)算 32
5.4.1  抗剪計(jì)算 32
5.4.2  沖切計(jì)算 33
5.4.3  抗彎計(jì)算 35
6  結(jié)論與建議 37
結(jié)束語(yǔ) 38
參考文獻(xiàn) 39