圆砾泥岩复合地层泥水盾构下穿房屋沉降控制技术研究
发布时间：2019-06-06 18:56
【摘要】：圆砾泥岩复合地层中盾构微扰动施工控制是岩土工程实践中面临的难题。南宁地铁1号线盾构下穿友爱居民小组面临圆砾与泥岩复合地层的挑战,首先对泥水盾构泥浆性能指标进行优化,采用现场试验确定了富水圆砾地层袖阀管注浆加固浆液配合比;利用自动化监测系统对盾构下穿房屋的沉降进行实时监控,并借助及时通讯工具实现穿越施工中信息化施工;定义圆砾泥岩复合地层盾构开挖面内泥岩高度与盾构机刀盘直径的比值为复合比λ,分析掘进参数平均值随λ的变化规律。通过现场实测结果表明:袖阀管注浆能够有效的控制建筑物沉降,自动化监测能够实时反映盾构推进导致房屋变形,为施工反馈控制提供依据,泥水盾构在圆砾泥岩复合地层中会遇到开挖仓压力波动过大,刀盘扭矩、推力增大,贯入度降低等现象。当λ≤0.15上述现象基本不发生;当0.15≤λ0.6时,参数平均值波动最剧烈,对沉降控制十分不利;当λ≥0.6时,扭矩和总推力进一步增大,但开挖仓压力波动情况稍弱而贯入度会进一步降低。要以盾构开挖仓压力控制为指标而非追求推进速度,提高转速、降低泥浆黏度是减少参数波动的有效手段。
[Abstract]:The construction control of shield microdisturbance in round gravel mudstone composite formation is a difficult problem in geotechnical engineering practice. Under the shield of Nanning Metro Line 1, the group of friendly residents faces the challenge of gravel and mudstone composite strata. Firstly, the mud performance index of mud and water shield is optimized. The mixture proportion of slurry strengthened by sleeve valve pipe grouting in water-rich gravel formation was determined by field test. The automatic monitoring system is used to monitor the settlement of the shield pierced house in real time, and the information construction in the crossing construction is realized with the help of timely communication tools. The ratio of mudstone height in shield excavation surface to cutter diameter of shield machine in round gravel mudstone composite formation is defined as composite ratio 位, and the variation of average excavation parameters with 位 is analyzed. The results of field measurement show that sleeve valve pipe grouting can effectively control the settlement of buildings, and automatic monitoring can reflect the deformation of buildings caused by shield propulsion in real time, which provides the basis for construction feedback control. Mud-water shield in round gravel mudstone composite formation will encounter the phenomenon of excessive fluctuation of excavation silo pressure, torque of cutter head, increase of thrust, decrease of penetration and so on. When 位 鈮，
本文编号：2494525
[Abstract]:The construction control of shield microdisturbance in round gravel mudstone composite formation is a difficult problem in geotechnical engineering practice. Under the shield of Nanning Metro Line 1, the group of friendly residents faces the challenge of gravel and mudstone composite strata. Firstly, the mud performance index of mud and water shield is optimized. The mixture proportion of slurry strengthened by sleeve valve pipe grouting in water-rich gravel formation was determined by field test. The automatic monitoring system is used to monitor the settlement of the shield pierced house in real time, and the information construction in the crossing construction is realized with the help of timely communication tools. The ratio of mudstone height in shield excavation surface to cutter diameter of shield machine in round gravel mudstone composite formation is defined as composite ratio 位, and the variation of average excavation parameters with 位 is analyzed. The results of field measurement show that sleeve valve pipe grouting can effectively control the settlement of buildings, and automatic monitoring can reflect the deformation of buildings caused by shield propulsion in real time, which provides the basis for construction feedback control. Mud-water shield in round gravel mudstone composite formation will encounter the phenomenon of excessive fluctuation of excavation silo pressure, torque of cutter head, increase of thrust, decrease of penetration and so on. When 位 鈮，
本文编号：2494525
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