Abstract: With the increasing density of landmark buildings, the subway construction process on the ground worried about the environmental protection is a growing problem can not be ignored. Shield tunneling technology successfully used in subway construction, how reasonable prediction and control of shield construction of the surface deformation as a new topic. In the basis of an extensive literature, summarized previous calculation method, the finite element method of shield tunnel deformation of three-dimensional finite element simulation, compared with the measured data are more satisfied with the results.
Key words: tunnel, ground deformation, three-dimensional finite element analysis
1.Facebook:
After the introduction of shield tunnel with a century of development, while significant development, but inevitably lead to formation of the disturbance caused by ground deformation and land subsidence, especially in the shield tunnel in soft soil particularly. Disturbance lead to soil disturbance led to the strength and modulus decrease will lead to a long consolidation and secondary consolidation settlement. Deformation over a range of local level, it will seriously endanger the adjacent buildings and the safety of underground pipeline network, causing a series of geotechnical problems. Thus, the construction of the shield around the formation mechanism of disturbance is significant.
摘要：隨著地標(biāo)建筑物密度與日俱增，在地鐵建筑過程中對地表壞境的保護(hù)是一個越來越不能忽視的難題。盾構(gòu)法隧道施工技術(shù)成功運用于地鐵施工后，如何合理預(yù)測和控制盾構(gòu)施工對地表變形的影響成為了一個新課題。在查閱大量文獻(xiàn)的基礎(chǔ)上，總結(jié)前人計算方法，利用有限元方法對盾構(gòu)隧道進(jìn)行了三維有限元的變形模擬分析，與實測數(shù)據(jù)相比較計算結(jié)果較為滿意。
關(guān)鍵詞：盾構(gòu)隧道、地表變形、三維有限元分析
1.引言
盾構(gòu)隧道施工技術(shù)經(jīng)過了一百年的發(fā)展，雖然有了很大的發(fā)展，但不可避免引起地層的擾動，引起地層變形及地面沉降，特別是在軟土盾構(gòu)隧道中尤甚。擾動導(dǎo)致擾動導(dǎo)致土體強(qiáng)度和壓縮模量降低將引起長時間的固結(jié)和次固結(jié)沉降。當(dāng)?shù)貙幼冃纬^一定范圍時，將會嚴(yán)重危及臨近建筑物和地下管線網(wǎng)的安全，引起一系列的巖土問題。由此可見，盾構(gòu)施工對周圍地層擾動機(jī)理的研究具有重要的意義。