富水砂层土压平衡盾构渣土改良应用研究
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摘要
在盾构施工过程中,通常要求刀盘范围内的土体具有一定的流塑性和低渗透性,但实际施工时,土体条件往往不具备这种特性。为此,需要对刀盘范围进行改良。文章从土压平衡盾构机的工作原理着手,分析了土压平衡盾构机在砂土地层中施工的主要问题和常见的几种盾构施工渣土改良方法,并以福州地铁2号线桔洪区间土体为试验土样,对比分析了膨润土、高分子材料和聚合物等改性助剂对砂土的改良效果,为指导富水砂层盾构渣土改良提供了有力依据。
In the course of shield construction, it is usually required that the soil in the range of the cutter plate has some characteristics of flow plasticity and low permeability, but it often does not have this characteristic in the actualconstruction. Therefore, it is necessary to improve the range of the cutter disk. Based on the working principle of earthpressure balance shield machine, this paper analyzes the main problems in the construction of earth pressure balanceshield machine in sand soil layer, and several common methods for improving the residual soil of shield construction.The improvement effect of bentonite, polymer material and polymer on the soil was compared with the soil samplesbetween the Fuzhou Metro Line 2. It provides a strong basis for guiding the improvement of shield soil in water rich sand layer.
In the course of shield construction, it is usually required that the soil in the range of the cutter plate has some characteristics of flow plasticity and low permeability, but it often does not have this characteristic in the actualconstruction. Therefore, it is necessary to improve the range of the cutter disk. Based on the working principle of earthpressure balance shield machine, this paper analyzes the main problems in the construction of earth pressure balanceshield machine in sand soil layer, and several common methods for improving the residual soil of shield construction.The improvement effect of bentonite, polymer material and polymer on the soil was compared with the soil samplesbetween the Fuzhou Metro Line 2. It provides a strong basis for guiding the improvement of shield soil in water rich sand layer.
引文
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[5]SOTIRIS P.Properties of foam/sand mixtures for tun-neling applications[D].UK:Department of EngineeringScience,2001.
[6]JANCSECZ S,KRAUSE R,LANGMAACK L.Usingthe slump test to assessthe behavior of conditioned soilfor EPB tunneling[J].Environmental&EngineeringGeoscience,2009(3):167-174.
[7]王明胜.复杂地层中盾构法隧道渣土改良技术[J].地下空间与工程学报,2007(8):1445-1447.
[8]黄德中.超大直径土压平衡盾构施工土体改良试验研究[J].现代隧道技术,2011(4):65-71.
[9]魏康林.土压平衡盾构施工中泡沫和膨润土改良土体的微观机理分析[J].现代隧道技术,2007(1):73-77.
[2]宋克志,汪波,孔恒,等.无水砂卵石地层土压盾构施工泡沫技术研究[J].岩石力学与工程学报,2005(13):2237-2239.
[3]丛恩伟.北京地铁十号线砂卵石地层盾构法隧道施工关键技术[J]铁道标准设计,2008(12):168-170.
[4]朱伟,郭涛,魏康林.盾构用气泡的性能及对开挖土体改良效果影响[J].地下空间与工程学报,2006(4):571.
[5]SOTIRIS P.Properties of foam/sand mixtures for tun-neling applications[D].UK:Department of EngineeringScience,2001.
[6]JANCSECZ S,KRAUSE R,LANGMAACK L.Usingthe slump test to assessthe behavior of conditioned soilfor EPB tunneling[J].Environmental&EngineeringGeoscience,2009(3):167-174.
[7]王明胜.复杂地层中盾构法隧道渣土改良技术[J].地下空间与工程学报,2007(8):1445-1447.
[8]黄德中.超大直径土压平衡盾构施工土体改良试验研究[J].现代隧道技术,2011(4):65-71.
[9]魏康林.土压平衡盾构施工中泡沫和膨润土改良土体的微观机理分析[J].现代隧道技术,2007(1):73-77.