Stabilisation mechanisms of polymer solutions in the context of temporary earth-wall support = Stabilisierungswirkung von Polymerlösungen bei der Stützung [...] : = Stabilisierungswirkung von Polymerlösungen bei der Stützung von Erdwänden / Rowena Verst. Wuppertal : Eigenverlag des Herausgebers, [2021]
Inhalt
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- Introduction
- Theoretical background
- Requirements for support fluids in deep foundations and tunnelling
- Polymer solutions
- Polymer products and classification
- Rheology of viscous polymer solutions
- Transport behaviour and sedimentation of suspended material
- Physicochemical and mechanical stability
- Environmental relevance
- Penetration behaviour of polymer solutions into soil
- Interaction parameters
- Analytical-empirical approaches for viscous fluids
- Influence of suspended material
- Conclusions and open questions
- Laboratory experiments
- Experimental methods for preparation and testing
- Material characterization
- Soil characteristics
- Viscosifier properties and bulk rheology
- Base fluid stability
- Granular additive characteristics
- Results: vertical penetration – large scale (V-L)
- General
- Viscous base polymer solutions – no additives
- Discussion on the applicability of capillary bundle approximations
- Addition of quartz mineral grains
- Addition of bentonite suspension
- Addition of polymeric grains
- Results: vertical penetration – small scale (V-S)
- General
- Soil classification for viscous flow
- Viscous flow and micro-colmation at soil fractions
- Colmation with quartz grains or bentonite suspension at soil fractions
- Soil and polymer classification for colmation
- Results: horizontal penetration – plane (H-P)
- Results: horizontal penetration – radial (H-R)
- Conclusions from soil penetration testing
- Stability conclusions
- Stability concept
- Exemplary calculation
- Safety levels
- Discussion on testing methods for quality control on site
- Overall concluding remarks
- Bibliography
- Appendix
- Basic equations at capillary and soil level
- Materials
- Bulk rheology
- Rheometer properties
- Rheometer interpretation
- Bulk rheological characterization – boundary effects
- Influence of polymer granule size
- Bingham approximation
- Power-law parameter determination
- V-L
- Device
- Start of polymer penetration
- Pressure sensor development
- Pressure drop curvatures normalized along s – no additives
- Capillary bundle approximation
- V-S/H-P/H-R
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