Accumulation of excess pore water pressure and post-cyclic settlement of saturated soft clay subjected to multi-directional cyclic simple shear

Trial embankment approximately 3 meters height, 10 meters of length, 16 meters width, and a slope of 1V: 2H was completed on soft clay site at RECESS, UTHM, Batu Pahat, Johor, Malaysia. Two embankments were respectively reinforced by a high strength geotextile (HSG) and the combination of bamboo and low strength geotextile or bamboo-geotextile composite (BGC) at the interface between embankment fill and foundation soil. Each embankment was installed with the same geotechnical instrumentation scheme for monitoring purposes. The purpose of this paper is to analyse the field performance for both embankments in terms of improving settlement embankment under the embankment. For this purpose, the settlement under the embankment, settlement at the surface of the embankment and the excess pore water pressure response were measured through geotechnical instrumentation for over 418 days. The results showed that the BGC system is more practical than HSG in terms of settlement and also in terms of cost, without compromising the quality of the embankment performance.

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Analysis of Settlement Induced by Dissipation of the Excess Pore Water Pressure Due to Piling in Soft Clay

Advances in Pile Foundations, Geosynthetics, Geoinvestigations, and Foundation Failure Analysis and Repairs ◽

10.1061/47631(410)11 ◽

2011 ◽

Author(s):

Hongyuan Fu ◽

Lou Xiaoyu

Keyword(s):

Pore Water ◽

Pore Water Pressure ◽

Water Pressure ◽

Soft Clay ◽

Excess Pore Water Pressure ◽

Excess Pore

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Accumulation of Pore Pressure in a Soft Clay Seabed around a Suction Anchor Subjected to Cyclic Loads

Journal of Marine Science and Engineering ◽

10.3390/jmse7090308 ◽

2019 ◽

Vol 7 (9) ◽

pp. 308 ◽

Cited By ~ 1

Author(s):

Li ◽

Chen ◽

Hu ◽

Wang ◽

Liu

Keyword(s):

Pore Pressure ◽

Pore Water ◽

Pore Water Pressure ◽

Kinematic Hardening ◽

Water Pressure ◽

Soft Clay ◽

Cyclic Loads ◽

Distribution Characteristics ◽

Excess Pore Water Pressure ◽

Excess Pore

A suction anchor is an appealing anchoring solution for floating production. However, the possible effects of residual pore pressure can be rarely found any report so far in term of the research and design. In this study, the residual pore pressure distribution characteristics around the suction anchor subjected to vertical cyclic loads are investigated in a soft clay seabed, and a three-dimensional damage-dependent bounding surface model is also proposed. This model adopts the combined isotropic-kinematic hardening rule to achieve isotropic hardening and kinematic hardening of the boundary surface. The proposed model is validated against triaxial tests on anisotropically consolidated saturated clays and normally consolidated saturated clays. The analytical results show that the excess pore water pressure accumulates primarily on the outside of the suction anchor, whereas negative pore water pressure mainly on the inside. The maximum values of both sides appear in the lower part of the seabed. According to the distribution characteristics of the residual pore pressure, a perforated anchor is proposed to reduce the accumulation of excess pore water pressure. A comparative study generally shows that the perforated anchor can effectively reduce the accumulation of excess pore water pressure.

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