本文選題：基坑開挖 + 隧道保護(hù)　； 參考：《深圳大學(xué)》2017年碩士論文

【摘要】：由于資本投資及土地資源稀缺,地鐵沿線將會(huì)出現(xiàn)高密度的物業(yè)開發(fā),各種高大建筑拔地而起,越來越多的深大基坑將會(huì)出現(xiàn)在地鐵隧道的周邊。深圳廣泛分布著深厚的軟土,在軟土中開挖的深基坑容易遇到諸多工程難題,如基坑容易出現(xiàn)變形過大甚至出現(xiàn)垮塌、傾覆等安全事故,對(duì)社會(huì)及經(jīng)濟(jì)產(chǎn)生重大影響。另外,由于基坑開挖容易誘發(fā)周邊土體的位移及應(yīng)力場(chǎng)發(fā)生變化,對(duì)鄰近地鐵隧道產(chǎn)生不利影響,進(jìn)而對(duì)隧道的安全運(yùn)營(yíng)及結(jié)構(gòu)安全構(gòu)成威脅。因此在施工前準(zhǔn)確分析及預(yù)測(cè)基坑及隧道的變形將具有重要的意義。有限元數(shù)值模擬分析是常用的有效手段,但在計(jì)算過程中設(shè)計(jì)人員往往面臨如何選取合的適本構(gòu)模型及確定合理參數(shù)的難題�；趯�(shí)際需求,本文的主要研究工作如下:(1)以深圳前海區(qū)原狀軟土為試驗(yàn)對(duì)象,通過一系列室內(nèi)試驗(yàn)研究軟土的力學(xué)特性及測(cè)定H-S模型參數(shù),并建立參數(shù)之間的相關(guān)關(guān)系,使得可以從簡(jiǎn)單室內(nèi)試驗(yàn)或巖土勘察報(bào)告中推算出主要模型剛度參數(shù)。同時(shí)對(duì)比分析試樣在側(cè)向卸荷與加載條件下的參考割線模量之間的關(guān)系。(2)在前海某基坑開挖的基礎(chǔ)上,分別運(yùn)用不同的本構(gòu)模型及不同的H-S模型剛度參數(shù)建立三維有限元模型進(jìn)行計(jì)算分析,將計(jì)算結(jié)果與實(shí)測(cè)結(jié)果進(jìn)行對(duì)比,分析模型的適用性。(3)通過從改變支護(hù)結(jié)構(gòu)剛度、地下連續(xù)墻的厚度及插入比、隧道與基坑的間距、隧道埋深等方面研究了不同因素在基坑開挖過程中對(duì)隧道的影響。(4)從“控制基坑變形、阻斷變形傳遞、隧道保護(hù)”三方面總結(jié)基坑開挖對(duì)隧道影響控制的措施,為設(shè)計(jì)優(yōu)化及施工提供參考依據(jù)。
[Abstract]:Because of the capital investment and the scarcity of land resources, the property along the MTR will be the development of high density, all the tall buildings, the surrounding foundation pit will be more and more appear in the subway tunnel. Shenzhen is widely distributed in deep soft soil, deep foundation pit excavation in soft soil is easy to encounter many engineering problems, such as prone to deformation of foundation pit too large or even collapse, overturning safety accidents, have a significant impact on society and economy. In addition, the displacement of surrounding soil excavation and induced stress field change, have an adverse effect on the adjacent subway tunnels, pose a threat to the safe operation and safety of the tunnel structure. Therefore in the construction of the accurate analysis deformation prediction of foundation pit and tunnel and will be of great significance. The finite element numerical simulation analysis is an effective method used in the calculation process, but the designer How to select the problems often face the constitutive model and determine reasonable parameters. Based on the actual demand, the main research work of this paper is as follows: (1) in Shenzhen District of Qianhai undisturbed soft soil as the research object, through the determination of the parameters of H-S model and mechanical properties of a series of laboratory test on the soft soil, and the establishment of related parameters between the calculated parameters, the stiffness model mainly from simple laboratory test report or geotechnical investigation and comparative analysis. The relationship between the reference specimen unloading secant modulus load and loading conditions on the side. (2) based on the excavation of a foundation pit in Qianhai, respectively, using different constitutive parameters of stiffness model and the H-S model to establish a three-dimensional finite element model for calculation and analysis of calculation results and measured results are compared. The applicability of the model is analyzed. (3) through the change from the supporting structure stiffness, underground continuous The thickness of the wall and the insertion ratio, distance between tunnel and excavation, tunnel depth and other aspects of the influence of different factors on the tunnel in the excavation process. (4) from the "deformation control of foundation pit deformation, block transfer, tunnel protection" three aspects on control measures of tunnel excavation, provide a reference for the optimization design and construction.

【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU447

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 章紅兵;范凡;胡昊;;基坑群施工對(duì)鄰近隧道影響與隧道保護(hù)[J];上海交通大學(xué)學(xué)報(bào);2016年05期

2 趙晶;;深大基坑施工對(duì)隧道的影響分析及保護(hù)對(duì)策[J];土工基礎(chǔ);2016年02期

3 吳才德;曾婕;成怡沖;龔迪快;;深基坑開挖空間效應(yīng)對(duì)周圍土體及鄰近隧道的影響研究[J];建筑結(jié)構(gòu);2016年02期

4 李連祥;符慶宏;張永磊;魯芬婷;;基坑離心模型試驗(yàn)開挖方法研究與應(yīng)用[J];巖石力學(xué)與工程學(xué)報(bào);2016年04期

5 胡欣;;模型試驗(yàn)?zāi)M不同工況下基坑開挖對(duì)既有隧道的影響[J];路基工程;2015年06期

6 丁傳松;;深基坑施工對(duì)鄰近大直徑隧道的影響研究[J];施工技術(shù);2015年S1期

7 江浩;李榮建;閆蕊;劉軍定;張媛;;隧道模型試驗(yàn)中幾何比尺相似程度的差異性及影響比較[J];巖土力學(xué);2015年S1期

8 宋廣;宋二祥;;基坑開挖數(shù)值模擬中土體本構(gòu)模型的選取[J];工程力學(xué);2014年05期

9 唐仁;林本海;;基坑工程施工對(duì)鄰近地鐵盾構(gòu)隧道的影響分析[J];地下空間與工程學(xué)報(bào);2014年S1期

10 姜崢;;基坑開挖引起鄰近管線變形的理論解析[J];地下空間與工程學(xué)報(bào);2014年02期

，

本文編號(hào)：1765711