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Geotextile encased columns (GEC) used as pressure-relief system. Instrumented bridge abutment case study on soft soil

机译:土工布包裹柱(GEC)用作泄压系统。仪器仪表桥台在软土上的案例研究

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Geosynthetic Encased Sand Columns (GEC) have been frequently adopted in geo-engineering practice to improve bearing capacity, reduce settlements and accelerate consolidation in saturated soft cohesive ground (e.g. Alexiew et al, 2005; Alexiew et al., 2012; Raithel et al, 2005). The present paper extends these early views by introducing the use of columns to reduce the magnitude of horizontal earth pressures acting on structures adjacent to compaction fills. The monitoring program of a full-scale bridge abutment on soft soil supported by GECs and geogrid reinforced system is described, where field performance is monitored with pressure cells, electrical piezometers, inclinometers and settlement plates. Analytical and numerical analyses have been performed to help on interpreting experimental measurements. The collected database is interpreted to demonstrate that GEC can reduce by up to 50% the horizontal earth pressure over bridge border foundation piles when compared to values predicted for unreinforced ground and demonstrate that the work conformed to acceptable limits of behavior. (C) 2017 Elsevier Ltd. All rights reserved.
机译:土工合成材料包裹砂柱(GEC)在地质工程实践中经常被采用,以提高承载力,减少沉降并加速饱和软粘性地面的固结(例如Alexiew等,2005; Alexiew等,2012; Raithel等, 2005年)。本文通过介绍使用立柱来减小作用在压实填充附近的结构上的水平土压力的大小,从而扩展了这些早期观点。描述了由GEC和土工格栅增强系统支撑的软土上全尺寸桥台的监控程序,其中使用压力传感器,电测压计,倾角仪和沉降板监控现场性能。进行了分析和数值分析,以帮助解释实验测量结果。解释所收集的数据库以证明与未加固地面的预测值相比,GEC可以将桥梁边界基础桩上的水平土压力降低多达50%,并证明工作符合行为的可接受范围。 (C)2017 Elsevier Ltd.保留所有权利。

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