Diaphragm Wall Construction Techniques

Nash, Kevin L.

doi:10.1061/jcceaz.0000462

Cited by 4 publications

(2 citation statements)

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“…During construction, a trench is first excavated under a head of cement–bentonite slurry. The cement–bentonite slurry is prepared in situ by mixing cement with a pre-hydrated bentonite slurry just before its discharge into the trench [ 27 ]. The composition and mix design of the cement–bentonite slurry was frequently varied until the role of each ingredient was understood [ 22 , 28 ].…”

Section: MIX Design and Engineering Propertiesmentioning

confidence: 99%

Vertical Barriers for Land Contamination Containment: A Review

Cao

Wang

et al. 2021

IJERPH

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Soil pollution is one of the major threats to the environment and jeopardizes the provision of key soil ecosystem services. Vertical barriers, including slurry trench walls and walls constructed with soil mix technology, have been employed for decades to control groundwater flow and subsurface contaminant transport. This paper comprehensively reviewed and assessed the typical materials and mechanical and permeability properties of soil–bentonite, cement–bentonite and soil mix barriers, with the values of mix design and engineering properties summarized and compared. In addition, the damage and durability of barrier materials under mechanical, chemical, and environmental stresses were discussed. A number of landmark remediation projects were documented to demonstrate the effectiveness of the use of barrier systems. Recent research about crack-resistant and self-healing barrier materials incorporating polymers and minerals at Cambridge University and performance monitoring techniques were analyzed. Future work should focus on two main areas: the use of geophysical methods for non-destructive monitoring and the optimization of resilient barrier materials.

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Section: MIX Design and Engineering Propertiesmentioning

confidence: 99%

Vertical Barriers for Land Contamination Containment: A Review

Cao

Wang

et al. 2021

IJERPH

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“…The underground continuous wall is a kind of underground wall with a variety of trenching machines. Under the protective effect of the mud, narrow and deep grooves are dug in the ground and suitable materials are poured into it to form a continuous underground wall with water-proof, soil retaining and load-bearing functions (Bucksch, 2013; Nash, 1974). In the construction process of the subway, it has the advantages of good overall stability, high rigidity, good waterproof effect and fast construction speed, so it has received much attention and is widely used (Zhuang et al , 2019; Tsai et al , 2000).…”

Section: Introductionmentioning

confidence: 99%

Study on preparation and properties of novel ternary flocculant for rapid separation of underground continuous wall waste mud

Zhang

Kong

Sun

et al. 2020

PRT

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Purpose A novel ternary flocculant was prepared by a simple compounding method to achieve efficient and rapid mud-water separation. This paper aims to discuss the possible mud-water separation mechanism. Design/methodology/approach This experimental study aims to investigate the effects of different types of flocculants on the separation of waste mud water and the degradation of flocculants in the supernatant. The flocculating component, the ratio of the flocculating accelerator to the flocculant and the addition amount of the novel ternary flocculant were optimized. Findings The experimental results show that the composition of the new ternary flocculant is cationic polyacrylamide (CP-02), grafted starch (GS-501) and flocculation sedimentation accelerator, the best effect, the mass ratio is 1:0.5: 0.75. According to 0.25:1 (volume ratio), the new ternary flocculant is pre-configured into a solution with a concentration of 3 kg/m3 to achieve efficient and rapid mud-water separation. Originality/value The new ternary flocculant is used for the separation of mud and water in the underground continuous wall waste mud, improving the level of civilized construction.

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Slurry wall containment performance: monitoring and modeling of unsaturated and saturated flow

Pedretti

Masetti

Marangoni

et al. 2011

Environ Monit Assess

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A specific 2-year program to monitor and test both the vadose zone and the saturated zone, coupled with a numerical analysis, was performed to evaluate the overall performance of slurry wall systems for containment of contaminated areas. Despite local physical confinement (slurry walls keyed into an average 2-m-thick aquitard), for at least two decades, high concentrations of chlorinated solvents (up to 110 mg l(-1)) have been observed in aquifers that supply drinking water close to the city of Milan (Italy). Results of monitoring and in situ tests have been used to perform an unsaturated-saturated numerical model. These results yielded the necessary quantitative information to be used both for the determination of the hydraulic properties of the different media in the area and for the calibration and validation of the numerical model. Backfill material in the shallower part of the investigated aquifer dramatically affects the natural recharge of the encapsulated area. A transient simulation from wet to drought periods highlights a change in the ratio between leakages from lateral barriers that support a specific scenario of water loss through the containment system. The combination of monitoring and modelling allows a reliable estimate of the overall performance of the physical confinement to be made without using any invasive techniques on slurry wall.

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Diaphragm Wall Construction Techniques

Cited by 4 publications

References 0 publications

Vertical Barriers for Land Contamination Containment: A Review

Vertical Barriers for Land Contamination Containment: A Review

Study on preparation and properties of novel ternary flocculant for rapid separation of underground continuous wall waste mud

Slurry wall containment performance: monitoring and modeling of unsaturated and saturated flow

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