Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Load–settlement behaviour of membrane-confined grouted pile: experimental and analytical study
In karst areas, the use of bored pile is often limited due to the loss of injected grout slurry. A novel technique is proposed to install a membrane with jet nozzle, through which jet grouting is implemented for expanding the membrane to form good interaction with the surrounding rock. Casting tests are conducted to examine how a membrane deforms subjected to a uniformly applied grout pressure. A mathematical model is derived to estimate the bulb length as a function of grout pressure and water/cement ratio. The critical bulb length is suggested to be 0.8 times the diameter of karst cave. Model-scale laboratory tests are performed on membrane-confined grouted piles under axial loading. The results show that membrane-confined grouted pile can have a much higher bearing capacity by 1.5 times and a much lower settlement by 50% compared to conventional pile. The contributions of skin friction and bulb resistance account for over 90% of the axial resistance, whereas the pile tip resistance is within 10% of the axial resistance. The pile’s bearing capacity increases with the bulb length, bulb number and bulb depth. An analytical model is further proposed to predict the load–settlement behaviour of membrane-confined grouted pile for use in practice.
Load–settlement behaviour of membrane-confined grouted pile: experimental and analytical study
In karst areas, the use of bored pile is often limited due to the loss of injected grout slurry. A novel technique is proposed to install a membrane with jet nozzle, through which jet grouting is implemented for expanding the membrane to form good interaction with the surrounding rock. Casting tests are conducted to examine how a membrane deforms subjected to a uniformly applied grout pressure. A mathematical model is derived to estimate the bulb length as a function of grout pressure and water/cement ratio. The critical bulb length is suggested to be 0.8 times the diameter of karst cave. Model-scale laboratory tests are performed on membrane-confined grouted piles under axial loading. The results show that membrane-confined grouted pile can have a much higher bearing capacity by 1.5 times and a much lower settlement by 50% compared to conventional pile. The contributions of skin friction and bulb resistance account for over 90% of the axial resistance, whereas the pile tip resistance is within 10% of the axial resistance. The pile’s bearing capacity increases with the bulb length, bulb number and bulb depth. An analytical model is further proposed to predict the load–settlement behaviour of membrane-confined grouted pile for use in practice.
Load–settlement behaviour of membrane-confined grouted pile: experimental and analytical study
Acta Geotech.
Xu, Meijuan (Autor:in) / Zhang, Fuyou (Autor:in) / Ni, Pengpeng (Autor:in) / Mei, Guoxiong (Autor:in)
Acta Geotechnica ; 18 ; 2777-2793
01.05.2023
17 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Bulb , Bulb resistance , Grouting , Membrane-confined grouted pile , Skin friction , Tip resistance Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
Pile Load Testing of Grouted Pile Across Western Canadian Artic
| British Library Conference Proceedings | 1992