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首页> 外文期刊>Geosciences >Data-Driven Field Observational Method of a Contiguous Bored Pile Wall System Affected by Accidental Groundwater Drawdown
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Data-Driven Field Observational Method of a Contiguous Bored Pile Wall System Affected by Accidental Groundwater Drawdown

机译：由偶然地下水拔出影响的连续钻孔桩墙系统的数据驱动现场观测方法

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This paper presents the use of a 700 mm-diameter contiguous bored pile (CBP) wall for a main basement deep excavation project with cut-and-cover tunnel. Due to the presence of cement grout columns between piles behind the CBP wall, the main basement was considered to be ‘impermeable’. However, site observations have shown that installation of ground anchors have unintentionally punctured the water tightness of the wall, creating leakages through the CBP wall and the possibility of localized groundwater lowering, as evidenced by the relatively large settlements. In the absence of cement grout columns at the cut-and-cover tunnel section, immediate groundwater drawdown was observed with the excavation rate. Settlement induced by the excavation and groundwater drawdown only slowed down upon the casting of skinwall to prevent groundwater from flowing through the wall. The accidental groundwater leakage led to small wall deflection. The ratio of maximum settlement to maximum deflection is atypical to those reported in the literature. The analysis also revealed that corner effect is significant with smaller settlement registered at the corners of the wall.
机译：本文介绍了一个带有剪切和覆盖隧道的主要地下室深度挖掘工程的700毫米连续钻孔桩（CBP）墙。由于CBP墙壁桩之间的水泥灌浆柱的存在，主要地下室被认为是“不透水”。然而，现场观察表明，接地锚的安装无意地刺破墙壁的水密封性，通过CBP墙体产生泄漏以及局部地下水降低的可能性，如相对较大的定居点所证明。在切割隧道部分的粘土灌浆柱的情况下，通过挖掘速率观察到即时地下水缩进。由挖掘和地下水绘制引起的沉降仅在皮肤铸造时减慢，以防止地下水流过墙壁。意外地下水泄漏导致小墙体偏转。对于文献中报道的那些，最大沉降与最大偏转的比率是非典型的。该分析还透露，角效应与墙壁角落注册的较小沉降是显着的。

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