...Toby Roberts; Martin Preene; William Powrie Temporary control of groundwater is required for excavations, tunnels or shafts that extend below groundwater level. It is typically needed early in the construction programme and any shortcomings in the groundwater control strategy will likely lead...

.... 12 01 2023 08 02 2024 Emerald Publishing Limited: All rights reserved 2025 construction dewatering excavation groundwater permeability rocks Figure 4. Configuration utilised in back-calculating the permeability from actual discharge pumped out of rock mass using...

...Qingsong Shen; Jun Wang; Hongyue Sun; Junwei Shu; Yuequan Shang In soft-soil siphon drainage, due to the siphon phenomenon, groundwater is discharged from the soil without the need for power and this increases the effective stress in the soil. A significant part of the drainage effect is determined...

... as a railway hazard, the Beijing–Guangzhou railway line in China was selected to identify karst features, using the multi-source frequency domain method because of its operational advantages. Abaqus was also used to numerically analyse the factors (dynamic loading, groundwater fluctuations, over-burden...

...Jiang Su, BEng, MPhil, PhD, CEng, FICE; Alan Bloodworth, MSc, DIC, MA, DPhil, CEng, MICE, MIStructE Groundwater pressure is the main cause of debonding (i.e. tensile failure) of the sprayed waterproofing membrane interface within composite sprayed concrete lined (SCL) tunnels. It is critical...

..., the Shaqiucun landslide, China. A parameter study is carried out and the influence of parameter setting on the drainage effect is discussed. groundwater hazards slopes – stabilisation λ is the friction coefficient and can be expressed as (Nakayama, 2018) 6 λ = 64 Re...

... of the retaining wall due to the presence of the vertical drainage layer. F = ( 2 m + 1 ) 2 π 10 04 2020 21 12 2020 ICE Publishing: All rights reserved 2020 granular materials groundwater retaining walls Starting in the late eighteenth century...

... that the primary cause of the landslide was an increase in the groundwater level (GWL) rather than engineering excavation. After analysing the region's hydrogeological conditions, it was found that the most likely reason for the increase in GWL was the filling of the natural gully. When the gully was full...

...Wei Xie, BEng; Hongyue Sun, PhD; Zhenlei Wei, PhD; Yuequan Shang, PhD; Xin Yan, BEng The drainage of groundwater is essential to slope stabilisation in both potential and existing landslides. Air injection is a new method for slope drainage that aims to control rapid rises in the groundwater level...

...., 2019) analyses, as well as for analysing potential water contamination for groundwater development, management and conservation (O'Kelly, 2016; O'Kelly et al., 2019; Patiño-Ramírez and Chávez-Alegría, 2017). For these reasons, indirect methods of determining permeability coefficients...

... with and without siphon drainage. The experimental results showed that the ultimate groundwater level was lowered below the surface of the soil. However, in the test performed without siphon drainage, the ultimate groundwater level was lowered to the surface of the soil. The time required to stabilise...

... pockets of dark grey fine sand and bioturbation. Some partings of cemented silt Safe mining of the remaining soil under the roof slab required a method of lateral retention of soil and groundwater. Bulk excavation then proceeded sequentially, protected by temporary SFRC side arches to allow...

...Martin Preene, BEng, PhD, CEng, CGeol, CSci, CEnv, FICE, FGS, C.WEM, FCIWEM; Toby O. L. Roberts, PhD, CEng, CGeol, FREng, FICE, FGS Construction dewatering is often required to control groundwater when excavations are made in Chalk, which is a relatively soft fissured limestone. The rate...

...Annan Zhou, PhD; Chun-Qing Li, PhD; Jinsong Huang, PhD Increases in rainfall and groundwater level rising can cause more frequent failures of unsaturated soil slopes, resulting in large-scale landslides. The aim of this paper is to propose a methodology for prediction of the failure of an infinite...

... Group is a variable series of clays, silts and sands, and the higher-permeability sands contain high pore pressures which are hazardous to SCL construction (Ciria, 2004). The significant hazard is the potential for groundwater seepage to occur within soils with limited cohesion, resulting in running...

... and were a useful calibration/confidence check on the latter. 15 12 2014 01 4 2014 ICE Publishing: All rights reserved 2015 geotechnical engineering groundwater grouting maintenance & inspection tunnels & tunnelling In August 2010 an inspection carried out...

... to the party most able to control them. 01 4 2014 17 10 2014 ICE Publishing: All rights reserved 2015 groundwater risk & probability analysis tunnels & tunnelling Crossrail is a new railway system, which will provide a connection between the south-east and the south...

... with granular columns are ample regarding bearing capacity, but limited in respect to the settlement response. This paper presents a laboratory model study that considers the settlement performance of isolated pad footings bearing on reinforced sand deposits under the influence of a fluctuating groundwater...

... thermal conductivity may not be appropriate, as stratification of the ground can lead to differences in thermal performance, depending on the direction of heat flow. Groundwater flow within the Chalk aquifer is also shown to have an important effect on the long-term heat transfer characteristics. Table...

... from both open standpipes and GeO flushable piezometers that can measure suctions up to approximately 80 kPa (Ridley et al., 2003). 15 6 2012 11 11 2011 ICE Publishing: All rights reserved 2013 embankments groundwater weather a inflection point...