The settlement climbed to around 15 mm five months after the last grouting phase, roughly reverting to the figure before the final grouting phase.In other words, a 5 mm heave was generated. It had decreased to less than 9 mm by the time this phase was through. The maximum settlement had reached 14 mm just before the last grouting process on August 28, 1997.In other words, the vertical movement was controlled during the grouting process between 4 mm heave and 3 mm settlement. The settlement was in the range of 7–14 mm throughout the 20-month grouting period (February 1996–September 1997) used to regulate the tilt of the clock tower.At the time of the second successful study, which took place in February 1996, this had climbed to 11 mm. The northwest corner of the Clock Tower had a maximum settlement value of 9 mm when grouting began in December 1995.The settling of the Big Ben Clock Tower during construction is described as follows: The clock tower’s vertical displacements demonstrated the heavy cycles connected to the grouting phase and the following settling. The constant pumping from the neighbouring aquifer has significantly decreased the water pressure in the Thanet Beds and chalk at the Clock Tower site.īig Ben Clock Tower: Settlement of the clock tower during underground metro tunnel construction.The London clay has porous water pressures near hydrostatic equilibrium with the aquifer underneath it.With some tidal volatility, the groundwater level in the surrounding aquifer is around 9 metres below ground level.The Thanet-Beds are located 73 metres below the earth and are around 8 metres thick on top of the chalk.A thin layer of the pebble bed over sand may be found in the bottom 5 metres.It is mostly clayey soil, with a lower layer of mottled clay about 5 m thick and an upper layer of higher mottled clay 8 m deep, divided by a thin layer of laminated beds. The thickness of the Lambeth Group is 18 metres.Lambeth Group is located below, and Thanet-Beds, a geological formation composed of grey sand predominantly found in London, is perched above the chalk rock. The London clay is underneath the Lambeth Group. The London clay is also found 35 metres below the surface.Alluvium gravel comprises the top 5 to 8 metres of the earth.The geology of the Clock Tower is described as follows: What procedure is utilised to correct the Big Ben Clock Tower's tilt?.What is the cause of the Big Ben Clock Tower's tilt?.What is the Big Ben Clock Tower's highest observed tilt?.
What is the Big Ben Clock Tower's height?.Why was the Big Ben Clock Tower given the name?.Big Ben Clock Tower: Post-construction behaviour.Big Ben Clock Tower: Settlement of the clock tower during underground metro tunnel construction.
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