本文選題：地鐵隧道 + 地表沉降　； 參考：《浙江工業(yè)大學(xué)》2014年碩士論文

【摘要】：盾構(gòu)法以其獨(dú)有的智能化、安全、快捷等特點(diǎn)和優(yōu)勢迅速成為我國地鐵工程中一種重要的施工方法,在地下工程中得到廣泛的推廣和應(yīng)用。但是,由于盾構(gòu)施工不可避免的會(huì)引起地面沉降和變形,當(dāng)?shù)乇沓两颠^大時(shí)可能危及周圍建筑物和地下管線等的安全,造成嚴(yán)重的經(jīng)濟(jì)損失和社會(huì)影響。 本文以杭州地鐵二號線振寧路站～外環(huán)路站區(qū)間(9號盾構(gòu)區(qū)間)隧道工程為工程背景,采用實(shí)例分析和三維數(shù)值模擬等手段對地鐵隧道盾構(gòu)施工引起的地表沉降變化規(guī)律進(jìn)行了研究。主要研究內(nèi)容和結(jié)果如下： (1)沿縱向盾構(gòu)機(jī)切口前30m以內(nèi)和其后30m以內(nèi)為盾構(gòu)施工影響范圍,而盾構(gòu)機(jī)切口后30m為主要影響范圍,此范圍產(chǎn)生的地表沉降達(dá)90%以上；盾構(gòu)機(jī)切口前30m以外和其后30m以外的范圍不受影響或影響可被忽略。 (2)沿橫向盾構(gòu)單線推進(jìn)時(shí)對地表主要影響區(qū)域?yàn)樗淼垒S線兩側(cè)6m范圍內(nèi),約1倍洞徑；全部影響區(qū)域?yàn)樗淼垒S線兩側(cè)18m,為3倍洞徑。 (3)盾構(gòu)施工引起地表變形是不可避免的,盾構(gòu)機(jī)前方土體受擾動(dòng)是引起地表沉降的重要原因；在一定的地質(zhì)、相對埋深(H/D)等條件下,盾構(gòu)機(jī)前方土體受擾動(dòng)程度與盾構(gòu)土倉壓力關(guān)系密切。 (4)隨著土倉壓力的增加,切口前方土體的地表隆起不斷增加,但增加很小,后方土體的地表沉降值不斷減小,且減小量遠(yuǎn)遠(yuǎn)大于隆起的增加量。超平衡狀態(tài)時(shí),地表隆起值增加,地表沉降減小,且減小量遠(yuǎn)遠(yuǎn)大于增加量；欠平衡狀態(tài)時(shí),地表隆起值減小,地表沉降值增加,且增加量遠(yuǎn)遠(yuǎn)大于減小量。 (5)由于超平衡時(shí)地表沉降量比欠平衡時(shí)小很多,土倉壓力易控制在0.15MPa～0.20MPa以內(nèi),盡可能的減小地表沉降。所以,在盾構(gòu)機(jī)前方土體不被破壞的前提條件下,適當(dāng)增加土倉壓力是減小地表沉降很有效的措施。 (6)其它條件一定時(shí),地表沉降隨著注漿壓力的增加而減小。注漿壓力易控制在0.15MPa～0.30MPa以內(nèi),防止更大的地表沉降發(fā)生。
[Abstract]:Shield method has become an important construction method in subway engineering of our country because of its unique characteristics and advantages such as intelligence, safety and rapidity, and has been widely used in underground engineering. However, because the shield construction will inevitably cause land subsidence and deformation, the local surface settlement may endanger the safety of surrounding buildings and underground pipelines, resulting in serious economic losses and social impact. In this paper, the engineering background of the tunnel project between Zhenning Road Station and Outer Ring Road Station (No. 9 Shield Section) of Hangzhou Metro Line 2 is taken as the engineering background. The variation law of ground subsidence caused by shield tunneling construction of subway tunnel is studied by means of case analysis and 3D numerical simulation. The main contents and results are as follows: 1) along the longitudinal shield machine incision, the influence area of shield construction is within 30 m before and within 30 m after the incision of shield machine, and 30 m after the incision of shield machine is the main influence area, and the surface subsidence caused by this range is more than 90%; The area beyond 30 m before and 30 m after the incision of shield machine is not affected or affected can be neglected. 2) the main influence area on the ground surface is about 1 times diameter within 6 m range of the tunnel axis, and 18 m on both sides of the tunnel axis, and 3 times the diameter of the tunnel axis when advancing along the single line of transverse shield tunneling. The main influence area on the surface is 6 m on both sides of the tunnel axis, and 3 times the diameter of the tunnel. 3) the ground deformation caused by shield tunneling is inevitable, and the disturbance of soil in front of shield machine is the important cause of ground subsidence. The disturbance degree of soil in front of shield machine is closely related to the pressure of shield soil bunker. 4) with the increase of the pressure of the soil bunker, the surface uplift of the soil in front of the notch increases continuously, but the increase is very small, and the value of the surface settlement of the soil in the rear decreases continuously, and the decrease is much larger than the increase of the uplift. In the state of overbalance, the surface uplift value increases, the surface subsidence decreases, and the decrease amount is far greater than the increase amount; in the underbalanced state, the surface uplift value decreases, the surface subsidence value increases, and the increase amount is far greater than the decrease amount. 5) because the amount of land surface settlement is much smaller in excess equilibrium than in underbalance, the pressure of soil bunker is easy to be controlled within 0.15MPa~0.20MPa, and the surface subsidence is reduced as much as possible. Therefore, under the premise that the soil in front of shield machine is not destroyed, it is an effective measure to reduce the ground subsidence by increasing the pressure of soil bunker properly. 6) when other conditions are fixed, the surface subsidence decreases with the increase of grouting pressure. Grouting pressure is easy to be controlled within 0.15MPa~0.30MPa to prevent larger surface subsidence.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.43

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本文編號：1959250