【摘要】：隨著城市現(xiàn)代化的快速發(fā)展,越來越多的大型工程設施興建,大量的深基坑工程隨之出現(xiàn)。深基坑工程的開挖與支護作為基坑工程施工的重點及最為復雜的土木工程技術(shù)領域之一,同時也是目前研究的熱點和難點。本文以廣州獵德大廈深基坑工程為研究背景,選擇最優(yōu)的支護結(jié)構(gòu)類型進行支護結(jié)構(gòu)計算,采用FLAC3D軟件進行基坑開挖支護模擬,并對基坑開挖支護過程進行了現(xiàn)場監(jiān)測。本文主要研究工作及結(jié)論如下:(1)獵德大廈深基坑為一級基坑,開挖面積較大,周邊環(huán)境復雜,對沉降以及變形的要求相對較高,綜合比較各種支護方案的優(yōu)缺點,最終選定基坑主體選用排樁+錨索支護,采用雙排攪拌樁作為止水帷幕。選取基坑西北角BC1區(qū)段和西側(cè)A4A2區(qū)段進行支護設計計算,通過計算各開挖階段的土壓力分布和最大彎矩分布,確定排樁的參數(shù)和錨索參數(shù),經(jīng)過計算選用直徑為1200mm、樁間距為1400mm、樁長26m的鉆孔灌注樁,四道錨索,經(jīng)過基坑穩(wěn)定性驗算,滿足穩(wěn)定性要求。(2)采用FLAC3D軟件進行基坑開挖支護模擬,計算結(jié)果表明隨著開挖深度加大,基坑周圍土體的最大垂直位移發(fā)生在靠近基坑壁處,離基坑壁越近,土體水平位移越大,在基坑最上部坑壁處水平位移最大,產(chǎn)生大約20mm的變形,基坑周圍土體整體向基坑內(nèi)側(cè)移動,基坑變形值小于安全預警值,支護結(jié)構(gòu)安全合理。(3)在整個基坑開挖和支護施工過程中,對基坑進行了現(xiàn)場監(jiān)測。樁頂最大水平位移約14.8mm,基坑頂面最大沉降約7.21mm�？梢钥闯龌拥淖冃卧谠撝ёo設計方案下得到了很好的控制,達到安全目的。(4)圍護結(jié)構(gòu)的側(cè)向水平位移監(jiān)測數(shù)據(jù)和數(shù)值模擬計算結(jié)果相比,數(shù)值模擬計算數(shù)據(jù)大于最終實際監(jiān)測數(shù)據(jù),但總體變化趨勢一致,數(shù)值模擬計算結(jié)果相對保守,進一步說明了排樁+錨索支護方案的安全合理性。
[Abstract]:With the rapid development of urban modernization, more and more large engineering facilities are built, and a large number of deep foundation pit projects appear. The excavation and support of deep foundation pit engineering is one of the most complex technical fields of civil engineering as well as the focal point of foundation pit construction. At the same time, it is also the hot and difficult point of current research. In this paper, based on the research background of the deep foundation pit engineering of Guangzhou Gede Tower, the optimal type of supporting structure is selected to calculate the supporting structure, and the FLAC3D software is used to simulate the excavation of foundation pit, and the process of excavation and support of foundation pit is monitored on the spot. The main research work and conclusions of this paper are as follows: (1) the deep foundation pit of Gede Tower is a first class foundation pit. The excavation area is large, the surrounding environment is complex, the requirements for settlement and deformation are relatively high, and the advantages and disadvantages of various supporting schemes are comprehensively compared. Finally, the main body of foundation pit is supported by row pile and anchor cable, and double row mixing pile is used as waterproof curtain. BC1 section of the northwest corner of foundation pit and A4A2 section on the west side of the foundation pit are selected for supporting design and calculation. By calculating the distribution of earth pressure and maximum bending moment in each excavation stage, the parameters of pile row and anchor cable are determined. The bored cast-in-place pile with diameter 1200mm, pile spacing 1400mm, pile length 26m and four Anchorage cables are selected. The stability of foundation pit is checked and calculated. (2) FLAC3D software is used to simulate the excavation of foundation pit. The results show that with the increase of excavation depth, the maximum vertical displacement of soil around the foundation pit occurs near the wall of the foundation pit, the closer the soil is to the wall of the foundation pit, the greater the horizontal displacement of the soil is, and the maximum horizontal displacement occurs at the top of the pit wall. The deformation of the foundation pit is about 20mm, the soil around the foundation pit moves to the inside of the foundation pit, the deformation value of the foundation pit is less than the value of safety warning, and the supporting structure is safe and reasonable. (3) during the whole excavation and construction of the foundation pit, the field monitoring of the foundation pit is carried out. The maximum horizontal displacement of the pile top is about 14.8 mm and the maximum settlement of the top surface of the foundation pit is about 7.21mm. It can be seen that the deformation of foundation pit is well controlled under the support design scheme, and the purpose of safety is achieved. (4) the lateral horizontal displacement monitoring data of the retaining structure are compared with the numerical simulation results. The numerical simulation data is larger than the final actual monitoring data, but the overall change trend is the same, and the numerical simulation results are relatively conservative, which further shows the safety and rationality of the support scheme of the row pile anchor cable.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU753;TU433

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