— In recent years with the rapid development of urban rail transit and underground space utilisation the phenomenon of foundation pit excavation near existing metro tunnels has become increasingly common Meng et al 2022a Vinoth and MS 2022 Consequently research on the effects and control of foundation pit excavation on
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— Download Citation Assessment of behaviour of mechanized urban tunnels using plastic analysis under external loading during excavation It has been going to be obvious that using of TBM machines
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— At the middle period 30 to 90 days after excavation the excavation depth is m to m with a total excavation depth of 13m H ; the horizontal displacement of piles shows a dramatic increase which almost reaches the maximum When the excavation time reaches 60 days the horizontal displacement of the pile suddenly
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— The excavation of the tunnel were simulated in step by step procedure In the first phase based on initial stress field the geostatic equilibrium achieved The adjacent surface buildings and traffic loads were applied in the second step Then the tunnel was excavated by de activating the corresponding soil elements according to segment width
— It is known that hard rock excavation by means of tunnel boring machines TBM brings many benefits in terms of productivity and safety but at the same time the tunnel geometry is limited to a
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— m retaining wall Structural Drawing 3 Chainage 900 m 955 m Length = 55 m Height 2 m Top width of stem= 200 mm Bottom width of the stem= 250 mm Width of the toe= 550 mm Width of base slab
— The most prominent geological feature of the Opalinus Clay at Mont Terri is a bedding structure that moderately dips towards the SSE At the location of the FE tunnel the average bedding orientation of 139/33 strike/dip Jaeggi et al 2013 results in the excavation axis being approximately parallel to the strike of bedding bedded
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— The Misaki Sato Go ideal elastoplastic model is adopted and the two stage analysis theory is used to study the effect of tunnel excavation on short pile effect in this paper
Yêu cầu trực tuyến →— For the project in this paper the maximum slope of the large diameter shield tunneling is ‰ A refined numerical model that takes into account the construction loads and the hardening of synchronous grout during the shield tunneling with a large slope was established The influence of tunneling on the ground settlement and the force
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— Collapse accidents active failure mode are common in tunnel engineering construction The influences of the tunnel inclined angle δ 1 and inclined angle δ 2 of the ground surface on the shallow tunnel face stability are the tunnel inclined angle δ 1 and inclined angle δ 2 of the ground surface an improved active
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— The excavation of the foundation pit will cause changes in the soil stress field around the foundation pit and that may have adverse effects on the adjacent subway tunnels
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— But the tunnel blasting often leads to the damage or failure of the supporting structure The vibration response and failure modes of the temporary support structure under blasting excavation of tunnels were analyzed through field tests finite element simulations and theoretical analysis The results and suggestions are as follows 1
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— A train tunnel surrounding rock numerical model was established by using ABAQUS to analyze the dynamic response of a heavy haul railway tunnel in hard rock quantify the influence of the train
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— Foundation pit excavation may cause excessive uplift displacement and structural damage to the underlying shield tunnel In this paper the rationality of the excavation induced inputs in the current force based and displacement based methods is analyzed theoretically and verified by comparing the elastic finite element method FEM
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