南京地鐵復(fù)合地層盾構(gòu)穿越建筑物及河流關(guān)鍵參數(shù)研究
本文選題:復(fù)合地層 + 盾構(gòu)施工 ; 參考:《南京林業(yè)大學(xué)》2014年碩士論文
【摘要】:盾構(gòu)施工技術(shù)在重大地下工程中的應(yīng)用日益廣泛,已成為我國地鐵隧道建設(shè)的主要方法。隨著全國各大城市大規(guī)模投入地鐵隧道建設(shè),地質(zhì)條件差異性這一問題越發(fā)突出,對盾構(gòu)施工技術(shù)提出了更高的要求:盾構(gòu)在復(fù)合地層中掘進(jìn)參數(shù)選取、盾構(gòu)掘進(jìn)對建(構(gòu))筑物影響、盾構(gòu)穿越河流參數(shù)選取及防范措施等。 本文以南京地鐵三號線TA-14標(biāo)宏~勝區(qū)間為背景,通過資料調(diào)研、理論分析、公式推導(dǎo)、實(shí)測研究及數(shù)值模擬的綜合研究方法,對南京地區(qū)復(fù)合地層條件下盾構(gòu)掘進(jìn)參數(shù)及盾構(gòu)穿越建(構(gòu))筑物、河流影響進(jìn)行分析研究。主要研究成果如下: (1)根據(jù)盾構(gòu)施工參數(shù)理論計(jì)算公式,針對復(fù)合地層條件下盾構(gòu)推進(jìn)的情況,推導(dǎo)出了盾構(gòu)在復(fù)合地層中推進(jìn)所需的推力及扭矩計(jì)算公式。 (2)在理論基礎(chǔ)上選取合適的土倉壓力能有效控制開挖面穩(wěn)定性及盾構(gòu)前方土體沉降;適當(dāng)增大土倉壓力能減小盾構(gòu)開挖對土體損失的影響。 (3)在復(fù)合地層中,控制盾構(gòu)機(jī)姿態(tài)調(diào)整角度大小在5mm/m以內(nèi),同時設(shè)定注漿量為理論值的140%~175%,以提高注漿效果,,減小地層變形。 (4)根據(jù)數(shù)值模擬及公式推導(dǎo)得出復(fù)合地層沉降槽計(jì)算公式,并得出在復(fù)合地層中沉降槽半寬為3.5i。 (5)盾構(gòu)隧道開挖對嵌巖樁基影響較小,樁基在隧道軸線位置彎曲最大,最大值達(dá)3.15mm,可通過減小盾構(gòu)推力,降低推進(jìn)速度來控制樁基變形。 (6)盾構(gòu)穿越河流主要考慮開挖面穩(wěn)定性及隧道上浮兩方面。嚴(yán)格控制土倉壓力,保證出土量為理論值的96%;減小注漿壓力,提高注漿量為理論值的140%~180%;控制盾構(gòu)掘進(jìn)姿態(tài),減少糾偏次數(shù)。
[Abstract]:Shield construction technology has been widely used in major underground projects and has become the main method of subway tunnel construction in China. With the large-scale construction of subway tunnels in major cities in the country, the problem of the difference of geological conditions is becoming more and more serious, which puts forward higher requirements for shield construction technology: the selection of tunneling parameters in composite strata, The influence of shield tunneling on the building, the selection of parameters of shield tunneling through river and the preventive measures, etc. In this paper, based on the background of TA-14 tagged Hongsheng section of Nanjing Metro Line 3, the comprehensive research methods of data investigation, theoretical analysis, formula derivation, field measurement and numerical simulation are used. The parameters of shield tunneling and the influence of shield tunneling through building and river in Nanjing area are analyzed. The main research results are as follows: (1) according to the theoretical calculation formula of shield construction parameters, aiming at the situation of shield driving under the condition of composite stratum, The formulas for calculating the thrust and torque required for shield tunneling in composite strata are derived. 2) on the basis of theory, the stability of excavating surface and the settlement of soil in front of shield can be effectively controlled by selecting appropriate pressure of earth bunker. Properly increasing the pressure of soil silo can reduce the influence of shield excavation on soil loss. In composite strata, the angle of attitude adjustment of shield machine should be controlled within 5mm/m, and the grouting quantity should be set at 140% 175 in order to improve the grouting effect. According to the numerical simulation and formula derivation, the calculation formula of settlement trough in composite stratum is obtained, and it is concluded that the half width of settlement trough is 3.5i. in composite stratum, the excavation of shield tunnel has little influence on rock-socketed pile foundation. The maximum value of pile foundation bending in the tunnel axis is 3.15mm. The deformation of pile foundation can be controlled by reducing shield thrust and driving speed. Strictly control the pressure of soil bunker to ensure that the unearthed quantity is 96 of the theoretical value; reduce the grouting pressure and increase the grouting volume to the theoretical value of 140 ~ 180; control the heading posture of shield machine and reduce the number of deviation correction.
【學(xué)位授予單位】:南京林業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:U455.43;U231.3
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 錢七虎;巖土工程的第四次浪潮[J];地下空間;1999年04期
2 韓煊;羅文林;李寧;;地鐵隧道施工引起沉降槽寬度的影響因素[J];地下空間與工程學(xué)報(bào);2009年06期
3 陶連金;許有俊;王文沛;;盾構(gòu)穿越既有地鐵車站結(jié)構(gòu)安全評估[J];地下空間與工程學(xué)報(bào);2010年S1期
4 唐益群,葉為民,張慶賀;上海地鐵盾構(gòu)施工引起地面沉降的分析研究(三)[J];地下空間;1995年04期
5 房明;劉鎮(zhèn);周翠英;史海歐;;新建隧道盾構(gòu)下穿施工對既有隧道影響的三維數(shù)值模擬[J];鐵道科學(xué)與工程學(xué)報(bào);2011年01期
6 張明聚;劉曉娟;杜永驍;;復(fù)合地層中盾構(gòu)施工對鄰近建筑物群的影響分析[J];北京工業(yè)大學(xué)學(xué)報(bào);2013年02期
7 王明勝;徐軍哲;倪冰玉;;復(fù)雜地質(zhì)條件下盾構(gòu)法穿越新造海施工技術(shù)[J];隧道建設(shè);2007年06期
8 李明陽;楊海濤;鄒高明;;復(fù)合地層土壓平衡盾構(gòu)掘進(jìn)參數(shù)模擬分析研究[J];隧道建設(shè);2012年03期
9 周杜鑫,王國弼,金中林;盾構(gòu)掘進(jìn)參數(shù)與地面沉降控制[J];建筑施工;1994年06期
10 徐開達(dá),何維亨,周杜鑫,金中林;軟土地基盾構(gòu)推進(jìn)力和襯砌摩阻力的測試研究[J];建筑施工;1995年05期
相關(guān)博士學(xué)位論文 前1條
1 李宏安;砂—粘復(fù)合地層土壓平衡盾構(gòu)隧道開挖面穩(wěn)定性研究[D];中國地質(zhì)大學(xué)(北京);2013年
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