本文關(guān)鍵詞： 周邊逆作 中心島順作 基坑監(jiān)測 基坑開挖模擬 后注漿管線保護(hù)　出處：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國建筑業(yè)的迅速發(fā)展,各大、中型城市出現(xiàn)了大量的超高層建筑。由于超高層多建在城市繁華地區(qū)且多數(shù)為地標(biāo)性建筑,因此在基坑開挖方面不可避免地帶來了諸多施工難點(diǎn)。首先,超高層建筑大多是地標(biāo)性建筑對(duì)工期的要求十分嚴(yán)格,在不排除不確定性因素的條件下要盡量加快施工進(jìn)度以保證按時(shí)完成施工任務(wù);其次,超高層基坑深度較深,往往施工場地較小,且周邊人口密集,無法采用放坡的方法施工;再次,超高層基坑施工區(qū)域周邊建筑物密集,緊鄰商業(yè)區(qū)及住宅區(qū)。施工時(shí)對(duì)基坑周邊地表沉降的要求十分嚴(yán)格;最后,超高層建筑一般都緊鄰道路,車流量較大,車輛經(jīng)過的動(dòng)荷載對(duì)基坑周邊地下市政管線有著不可忽視的影響。本文結(jié)合天津市中鐵國際城詩景廣場與地鐵6號(hào)線民權(quán)門站超深基坑對(duì)以上施工難點(diǎn)進(jìn)行了探討。主要工作及研究成果如下:1、針對(duì)場地復(fù)雜地質(zhì)條件,工期要嚴(yán)求格和施工場地限制較多等問題,根據(jù)施工經(jīng)驗(yàn)和場地內(nèi)的實(shí)際情況,創(chuàng)新的采用了周邊環(huán)板逆作--中心島順做的施工方法,在保證質(zhì)量和安全的情況下按時(shí)的完成了施工任務(wù)。2、針對(duì)施工時(shí)對(duì)基坑周邊地表沉降要求高的問題,采用了基坑周邊地表沉降模擬和基坑開挖監(jiān)測技術(shù)。通過數(shù)值模擬和監(jiān)測數(shù)據(jù),掌握了基坑開挖過程中地下連續(xù)墻及周邊地表沉降等變化規(guī)律,能夠及時(shí)發(fā)現(xiàn)危險(xiǎn)源并作出響應(yīng)。3、針對(duì)車輛動(dòng)荷載對(duì)基坑周邊市政管線產(chǎn)生影響的問題,采用了后注漿地下管線保護(hù)技術(shù)。經(jīng)監(jiān)測數(shù)據(jù)表明,后注漿能夠起到保護(hù)地下管線的作用。本文研究對(duì)于確保詩景廣場超深基坑施工的安全具有實(shí)用價(jià)值,并且對(duì)天津地區(qū)類似工程的基坑開挖施工和周邊建筑物保護(hù)具有參考價(jià)值。
[Abstract]:With the rapid development of China's construction industry, a large number of super-tall buildings have appeared in large and medium-sized cities. Therefore, the excavation of foundation pit inevitably brings a lot of construction difficulties. First of all, most of the super-tall buildings are landmarks, and the requirements for the construction period are very strict. Under the condition of not excluding the uncertain factors, we should speed up the construction progress as far as possible to ensure the completion of the construction tasks on time. Secondly, the super high-rise foundation pit is deep in depth, and often the construction site is small, and the surrounding population is dense, so it is impossible to adopt the method of slope laying. Thirdly, the construction area of super high-rise foundation pit is close to the surrounding buildings, close to the commercial district and residential area. The requirement of ground subsidence around the foundation pit during construction is very strict. Finally, the super high-rise building is usually close to the road, and the traffic flow is large. The dynamic load passing through the vehicle has an important influence on the underground municipal pipeline around the foundation pit. This paper probes into the above construction difficulties with the combination of Shijing Square of Zhongtie International City in Tianjin and the ultra deep foundation pit of Civil Rights Gate Station of Metro Line 6. The main work and research results are as follows: 1. In view of the complex geological conditions of the site, According to the construction experience and the actual situation in the site, the construction method of circumferential annular plate is innovated. Under the condition of ensuring the quality and safety, the construction task. 2 was completed on time, aiming at the problem of high requirement for the ground settlement around the foundation pit during the construction. Through numerical simulation and monitoring data, the variation law of underground continuous wall and surrounding surface settlement during foundation pit excavation is grasped, which is based on the simulation of ground subsidence around foundation pit and monitoring technology of foundation pit excavation. To solve the problem of the influence of vehicle dynamic load on the municipal pipeline around the foundation pit, the post-grouting underground pipeline protection technology is adopted. The monitoring data show that, Post-grouting can protect underground pipelines. This study is of practical value to ensure the safety of ultra-deep foundation pit construction in Shijing Square. It also has reference value for the excavation of foundation pit and the protection of surrounding buildings in similar projects in Tianjin area.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU753

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