Numerical Investigation of Consolidation Induced by Prefabricated Horizontal Drains (PHD) in Clayey Deposits
- PDF / 1,454,849 Bytes
- 14 Pages / 547.087 x 737.008 pts Page_size
- 15 Downloads / 192 Views
(0123456789().,-volV) ( 01234567 89().,-volV)
ORIGINAL PAPER
Numerical Investigation of Consolidation Induced by Prefabricated Horizontal Drains (PHD) in Clayey Deposits Anjana R. Menon . Anjana Bhasi
Received: 29 June 2017 / Accepted: 19 October 2020 Springer Nature Switzerland AG 2020
Abstract In this work, the process of prefabricated horizontal drains (PHD) induced consolidation in clayey embankment fills is investigated by a numerical approach. Based on spacing parameters, the suitability of axisymmetric and plane strain conditions for modeling the drain has been studied, and the suitability zones and matching functions have been proposed. The implications of the use of elastoplastic models to simulate the behavior of in situ soil on the suitability zones and matching functions have also been studied. The numerical results were compared with the analytical unit cell solutions for axisymmetric and plane strain conditions. Further, the effect of PHD in improving the consolidation behavior of various soil types has been analyzed in terms of pore pressure dissipation and settlement. The studies showed that the drain improved ground is best modeled under axisymmetric conditions at lower spacing ratios, and plane strain conditions simulate the more distantly spaced cases. PHD was found to accelerate the consolidation process in soft soils significantly, and the effect was found to be most prominent in highly plastic soils. A. R. Menon Department of Civil Engineering, National Institute of Technology, Surathkal, Karnataka, India e-mail: [email protected] A. Bhasi (&) Department of Civil Engineering, National Institute of Technology Calicut, Kozhikode, Kerala, India e-mail: [email protected]; [email protected]
Keywords Prefabricated horizontal drains Suitability zones Unit cell Axisymmetric Plane strain
1 Introduction Prefabricated Vertical Drain (PVD) induced consolidation is one of the most widely accepted technique to accelerate consolidation in clayey deposits (Rowe and Taechakumthorn 2008; Indraratna et al. 2012; Krishnamoorthy and Kamal 2016). There are several consolidation theories reported available in the literature about this technique (Barron 1948; Hansbo 1979; Hird et al. 1992; Tang et al. 2013; Liu et al. 2007; Huang et al. 2016). Recently, a novel idea has been developed, namely Prefabricated Horizontal Drain (PHD), which is much like Prefabricated Vertical Drain but installed horizontally (Chai et al. 2014). PHD essentially consists of an outer geotextile filter fabric which permits water flow through it, restraining the soil particles, towards an inner polymeric core, which then drains the water to designated drainage exits. The low installation cost and reduced space requirements, combined with the ease of handling and inspection, make PHD a feasible solution to many problems associated with clayey deposits. It has been successfully used as a horizontal drainage path in a system of PVDs replacing sand blankets (Fig. 1a) and
123
Geotech Geol Eng
Fig. 1 Application of PH
Data Loading...
