New technical combination of seawater and ultrasound wave energy for excavation of highly plastic sticky clays in urban EPB tunneling

Tokgöz, Nuray

doi:10.1007/s10064-019-01720-x

Cited by 3 publications

(2 citation statements)

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“…Wang et al [14] investigated water-swelling characteristics of two polymers used for shield tunnel sealing gaskets. Tokgoz [15] proposed the use of seawater and ultrasound wave energy as a ground conditioning agent in TBM operations instead of chemical foaming agent. Watson et al [16] described the challenges that faced the construction of 2.9 km long 3.6 m dia water tunnel under New York Harbor.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Design of an Artificial Lake in Jafer Basin Based on Gravity Flow

Al-Habahbeh¹

2022

MMEP

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Jordan is a dry country which badly needs water bodies. This work proposes a design of a sustainable artificial lake in Jafer basin (JB). The design involves excavating a tunnel to connect Gulf of Aqaba (GoA) and JB, and building a pumping station at the end of the tunnel. The tunnel will have a downslope gradient to allow gravity flow of seawater from GoA to JB. Once the water arrives underneath JB, a series of pumps along an inclined shaft uplift the water into the basin creating an artificial Lake, with total water volume of 2,000 Million Cubic Meters (MCM). The time required to fill up the basin is three years. The tunnel diameter is 3 meters and the depth of the tunnel and the shaft is 1000 m. 2% of the lake surface will be covered by Photovoltaic (PV) panels to produce electricity for pumping and to reduce evaporation rate. The total investment cost is 10.1 B$ (Billion Dollar) spent over three years, after that, all the pumping power needed to counteract evaporation is provided by PV panels. Once completed, the project is expected to pay back by encouraging human settlement, tourism, agriculture and industry.

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Section: Introductionmentioning

confidence: 99%

Sustainable Design of an Artificial Lake in Jafer Basin Based on Gravity Flow

Al-Habahbeh¹

2022

MMEP

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“…Due to the many and ever larger tunneling projects planned in Europe and worldwide, several hundreds of millions of tons of soil debris (spoil material) will be produced in the coming years, bringing the associated issue of how to manage and dispose of them ( Milligan, 2000 ; Tokgöz, 2013 , 2020 ; Oggeri et al, 2014 ). In fact, it is estimated that a tunnel with a length of 50 Km and a cross section of 100 m 2 leads to 8 million m 3 of spoil material composed of different sizes of broken rocks or soil.…”

Section: Introductionmentioning

confidence: 99%

Isolation and Characterization in a Soil Conditioned With Foaming Agents of a Bacterial Consortium Able to Degrade Sodium Lauryl Ether Sulfate

et al. 2020

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The anionic surfactant Sodium Lauryl Ether Sulfate (SLES) is the principal component of several commercial foaming products for soil conditioning in the tunneling industry. Huge amounts of spoil material are produced during the excavation process and the presence of SLES can affect its re-use as a by-product. Anionic surfactants can be a risk for ecosystems if occurring in the environment at toxic concentrations. SLES biodegradability is a key issue if the excavated soil is to be reused. The aim of this study was to identify bacteria able to degrade SLES, so that it could potentially be used in bioaugmentation techniques. Enrichment cultures were performed using bacterial populations from spoil material collected in a tunnel construction site as the inoculum. A bacterial consortium able to grow in a few hours with SLES concentrations from 125 mg/L to 2 g/L was selected and then identified by Next Generation Sequencing analysis. Most of bacteria identified belonged to Gamma-Proteobacteria (99%) and Pseudomonas (ca 90%) was the predominant genus. The bacterial consortium was able to degrade 94% of an initial SLES concentration of 250 mg/L in 9 h. A predictive functional analysis using the PICRUSt2 software showed the presence of esterase enzymes, responsible for SLES degradation. The bacterial consortium selected could be useful for its possible seeding (bioaugmentation) on spoil material from tunneling excavation.

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