Field study of monotonic and cyclic lateral behaviour of piles in soft soils improved with and without vacuum preloading

Fu, Hongtao; Wang, Jun; Cai, Yuanqiang; Jin, Jinqiang; Dong, Quanyang; Hu, Xiuqing; Wang, Peng; Geng, Xueyu; Zhang, Dikang

doi:10.1007/s11440-020-00935-7

Cited by 7 publications

(2 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among the field studies, Abd Elaziz and El Naggar [5] investigated the cyclic behaviour of hollow flexible micropiles in stiff clay, reporting a reduction in stiffness attributed to gap formation between piles and soil due to two-way cyclic loading. A similar observation was made by Fu et al [30] for piles in soft soil. Brown et al [15] performed large-scale pile testing on instrumented plugged piles of 273 mm diameter in submerged dense sand under lateral cyclic loading, reporting significant densification of already dense sand with a relatively small loss of resistance due to two-way cyclic loading.…”

Section: Introductionsupporting

confidence: 86%

Battered minipile response to low-frequency cyclic lateral loading in very dense sand

Mondal

Disfani

2022

Acta Geotech.

View full text Add to dashboard Cite

This experimental study investigates the response of vertical and battered minipiles to two-way symmetrical low-frequency (0.1 Hz) cyclic lateral loading. Laboratory (1-g) tests were performed on scaled-down minipiles in very dense cohesionless soil, for batter angles of 0°, 25° and 45°. The cyclic loading is classified into two categories: multi-amplitude and long-term single amplitude, where force-controlled load was applied at a constant frequency. The minipiles were instrumented with optic fibres, and strain profiles were obtained at each loading stage, in both compression and tension stroke. The results are presented in terms of hysteresis loops, variation of normalised stiffness, minipile strain and bending moments under cyclic loading. In the multi-amplitude loading category, backbone curves show a stiffer force–displacement response in tension stroke than in compression stroke. For the single-amplitude category, the area of the hysteresis loop is largest for 45° battered minipiles with the lowest accumulated deformation. The normalised stiffness at the end of 50 cycles is highest for 25° minipiles with a value slightly greater than one. The strain profiles along the minipiles show stabilisation of measured strain before the number of cycle reaches 50, for all three battered conditions. A multi-surface hardening constitutive model is used to explain the effect of shearing and cyclic loading, with increasing loading amplitude on 25° battered minipiles. These test results are indicative of better performance capability of 25° battered minipiles, in terms of secant stiffness, compared to the vertical and 45° battered cases.

show abstract

Section: Introductionsupporting

confidence: 86%

Battered minipile response to low-frequency cyclic lateral loading in very dense sand

Mondal

Disfani

2022

Acta Geotech.

View full text Add to dashboard Cite

show abstract

“…Vacuum preloading was regarded as one of the effective methods of reinforcing foundations in areas with super soft soil [13]. Generally, it improved the load capacity and reduced settlement in airport runways, oil storage stations and land reclamation projects [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Vacuum Preloading for Chemically Conditioned Municipal Sludge

Li¹,

Zhan²,

Wang³

et al. 2023

Journal of Renewable Materials

View full text Add to dashboard Cite

Municipal sludge is a sedimentation waste produced during the wastewater process in sewage treatment plants. Among recent studies, pilot and field tests showed that chemical conditioning combined with vacuum preloading can effectively treat municipal sludge. To further understand the drainage and consolidation characteristics of the conditioning sludge during vacuum preloading, a large deformation nonlinear numerical simulation model based on the equal strain condition was developed to simulate and analyze the pilot and field tests, whereas the simulation results were not satisfactory. The results of the numerical analysis of the pilot test showed that the predicted consolidation degree was greater than that measured by the field tests, which is attributed to the relatively low permeability layer formed during the preloading process of the prefabricated vertical drain. To better reflect the consolidation process of the conditioned sludge, a simplified analysis method considering the low permeability layer around the prefabricated vertical drain was proposed. The initial permeability coefficient of the low permeability layer is determined via numerical simulations using finite difference method. The predicted settlement curve was in good agreement with the measured results, which indicated that the numerical simulation based on the equal strain condition considering the relatively low permeability layer can better analyze the consolidation process of ferric chloride-conditioning sludge with vacuum preloading.

show abstract

Effect of tamping interval on consolidation of dredged slurry using vacuum preloading combined with dynamic consolidation

et al. 2020

View full text Add to dashboard Cite

Field study of monotonic and cyclic lateral behaviour of piles in soft soils improved with and without vacuum preloading

Cited by 7 publications

References 20 publications

Battered minipile response to low-frequency cyclic lateral loading in very dense sand

Battered minipile response to low-frequency cyclic lateral loading in very dense sand

Numerical Simulation of Vacuum Preloading for Chemically Conditioned Municipal Sludge

Effect of tamping interval on consolidation of dredged slurry using vacuum preloading combined with dynamic consolidation

Contact Info

Product

Resources

About