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Dennis T. Bergado - One of the best experts on this subject based on the ideXlab platform.

  • prefabricated vertical drain pvd and deep cement mixing dcm stiffened dcm sdcm techniques for soft ground improvement
    IOP Conference Series: Earth and Environmental Science, 2018
    Co-Authors: Dennis T. Bergado, P V Long, Salisa Chaiyaput, Aramugam Balasubramaniam
    Abstract:

    Soft ground improvement techniques have become most practical and popular methods to increase soil strength, soil stiffness and reduce soil compressibility including the soft Bangkok clay. This paper focuses on comparative performances of prefabricated vertical drain (PVD) using surcharge, vacuum and heat preloading as well as the cement-admixed clay of Deep Cement Mixing (DCM) and Stiffened DCM (SDCM) methods. The Vacuum-PVD can increase the Horizontal coefficient of Consolidation, Ch, resulting in faster rate of settlement at the same magnitudes of settlement compared to Conventional PVD. Several field methods of applying vacuum preloading are also compared. Moreover, the Thermal PVD and Thermal Vacuum PVD can increase further the coefficient of Horizontal Consolidation, Ch, with the associated reduction of kh/ks values by reducing the drainage retardation effects in the smear zone around the PVD which resulted in faster rates of Consolidation and higher magnitudes of settlements. Furthermore, the equivalent smear effect due to non-uniform Consolidation is also discussed in addition to the smear due to the mechanical installation of PVDs. In addition, a new kind of reinforced deep mixing method, namely Stiffened Deep Cement Mixing (SDCM) pile is introduced to improve the flexural resistance, improve the field quality control, and prevent unexpected failures of the Deep Cement Mixing (DCM) pile. The SDCM pile consists of DCM pile reinforced with the insertion of precast reinforced concrete (RC) core. The full scale test embankment on soft clay improved by SDCM and DCM piles was also analysed. Numerical simulations using the 3D PLAXIS Foundation finite element software have been done to understand the behavior of SDCM and DCM piles. The simulation results indicated that the surface settlements decreased with increasing lengths of the RC cores, and, at lesser extent, increasing sectional areas of the RC cores in the SDCM piles. In addition, the lateral movements decreased by increasing the lengths (longer than 4 m) and, the sectional areas of the RC cores in the SDCM piles. The results of the numerical simulations closely agreed with the observed data and successfully verified the parameters affecting the performances and behavior of both SDCM and DCM piles.

  • behavior of vertical drain improved subsoil under embankment loading
    Soils and Foundations, 1995
    Co-Authors: Jinchun Chai, Saiichi Sakajo, Norihiko Miura, Dennis T. Bergado
    Abstract:

    ABSTRACT In order to analyze the effect of vertical drains in plane strain condition, a new matching procedure based on well resistance is proposed. The advantage of this procedure is that it not only matches the average degree of Horizontal Consolidation in axisymmetric by plane strain condition, but also yields a more realistic excess pore pressure distribution in Horizontal direction. The method was incorporated into finite element analysis, and it was demonstrated that half of the drain spacing could be modelled by one-column of elements. Then, an actual case history of an embankment on vertical drain improved subsoil was analyzed by the proposed method. It was shown that vertical drains have two effects on subsoils response: (1) increasing settlement rate, and (2) reducing lateral displacement. For the case analyzed, the vertical drain used was without a filter. For matching the surface settlement, a low discharge capacity of about 1.5 m3/year was found (fixed smear effect). The analysis results were compared with measured values, and it was found that discharge capacity may be reduced significantly with an increase of confining pressure on the sleeve (wall) of the drain.

Aramugam Balasubramaniam - One of the best experts on this subject based on the ideXlab platform.

  • prefabricated vertical drain pvd and deep cement mixing dcm stiffened dcm sdcm techniques for soft ground improvement
    IOP Conference Series: Earth and Environmental Science, 2018
    Co-Authors: Dennis T. Bergado, P V Long, Salisa Chaiyaput, Aramugam Balasubramaniam
    Abstract:

    Soft ground improvement techniques have become most practical and popular methods to increase soil strength, soil stiffness and reduce soil compressibility including the soft Bangkok clay. This paper focuses on comparative performances of prefabricated vertical drain (PVD) using surcharge, vacuum and heat preloading as well as the cement-admixed clay of Deep Cement Mixing (DCM) and Stiffened DCM (SDCM) methods. The Vacuum-PVD can increase the Horizontal coefficient of Consolidation, Ch, resulting in faster rate of settlement at the same magnitudes of settlement compared to Conventional PVD. Several field methods of applying vacuum preloading are also compared. Moreover, the Thermal PVD and Thermal Vacuum PVD can increase further the coefficient of Horizontal Consolidation, Ch, with the associated reduction of kh/ks values by reducing the drainage retardation effects in the smear zone around the PVD which resulted in faster rates of Consolidation and higher magnitudes of settlements. Furthermore, the equivalent smear effect due to non-uniform Consolidation is also discussed in addition to the smear due to the mechanical installation of PVDs. In addition, a new kind of reinforced deep mixing method, namely Stiffened Deep Cement Mixing (SDCM) pile is introduced to improve the flexural resistance, improve the field quality control, and prevent unexpected failures of the Deep Cement Mixing (DCM) pile. The SDCM pile consists of DCM pile reinforced with the insertion of precast reinforced concrete (RC) core. The full scale test embankment on soft clay improved by SDCM and DCM piles was also analysed. Numerical simulations using the 3D PLAXIS Foundation finite element software have been done to understand the behavior of SDCM and DCM piles. The simulation results indicated that the surface settlements decreased with increasing lengths of the RC cores, and, at lesser extent, increasing sectional areas of the RC cores in the SDCM piles. In addition, the lateral movements decreased by increasing the lengths (longer than 4 m) and, the sectional areas of the RC cores in the SDCM piles. The results of the numerical simulations closely agreed with the observed data and successfully verified the parameters affecting the performances and behavior of both SDCM and DCM piles.

Eric W Ford - One of the best experts on this subject based on the ideXlab platform.

  • assessing the impact of health system organizational structure on hospital electronic data sharing
    Journal of the American Medical Informatics Association, 2018
    Co-Authors: Jay A Holmgren, Eric W Ford
    Abstract:

    Objective Horizontal Consolidation in the hospital industry has gained momentum in the United States despite concerns over rising costs and lower quality. Hospital systems frequently point to potential gains in interoperability and electronic exchange of patient information as Consolidation benefits. We sought to assess whether hospitals in different health system structures varied in their interoperable data sharing. Materials and methods We created a cross-sectional national hospital sample from the 2014 AHA Annual Survey and 2015 IT Supplement. We combined the existing taxonomy of health system organizational forms and the ONC's functionality-based, technology-agnostic definition of interoperability. We used logistic regression models to assess the relationship between health systems' organizational forms and interoperability engagement, controlling for hospital characteristics. Results We found that interoperability engagement varied greatly across hospitals in different health system structures, with facilities in more centralized health systems more likely to be interoperable. Hospitals in one system type, featuring centralized insurance product development but diverse service offerings across member organizations, had significantly higher odds of being engaged in interoperable data sharing in our multivariate regression results. Discussion The heterogeneity in health system interoperability engagement indicates that incentives to share data vary greatly across organizational strategies and structures. Our results suggest that Horizontal Consolidation in the hospital industry may not bring significant gains in interoperability progress unless that Consolidation takes a specific business alignment form. Conclusion Policymakers should be wary of claims that Horizontal Consolidation will lead to interoperability gains. Future research should explore the specific mechanisms that lead to greater interoperability in certain health system organizational structures.

  • assessing the impact of health system organizational structure on hospital electronic data sharing
    Academy of Management Proceedings, 2018
    Co-Authors: Jay A Holmgren, Eric W Ford
    Abstract:

    Horizontal Consolidation in the hospital industry has continued to gain momentum in the United States despite concerns over rising costs and lower quality. Hospital systems often justify their merger and acquisition behavior by highlighting improved ability to control costs with interoperability, the electronic sharing of patient information, across member institutions. Previous research has shown that while the overall level of interoperability engagement is low, hospitals’ that are members of health care systems are more likely to share data electronically. We sought to determine whether health system structures are associated with hospital engagement in interoperability. We used national hospital data and combined existing taxonomies of health system structure to the functionality-based, technology-agnostic definition of interoperability promulgated by the Office of the National Coordinator for Health IT. We found that interoperability engagement varied greatly across hospitals using different system s...

Jay A Holmgren - One of the best experts on this subject based on the ideXlab platform.

  • assessing the impact of health system organizational structure on hospital electronic data sharing
    Journal of the American Medical Informatics Association, 2018
    Co-Authors: Jay A Holmgren, Eric W Ford
    Abstract:

    Objective Horizontal Consolidation in the hospital industry has gained momentum in the United States despite concerns over rising costs and lower quality. Hospital systems frequently point to potential gains in interoperability and electronic exchange of patient information as Consolidation benefits. We sought to assess whether hospitals in different health system structures varied in their interoperable data sharing. Materials and methods We created a cross-sectional national hospital sample from the 2014 AHA Annual Survey and 2015 IT Supplement. We combined the existing taxonomy of health system organizational forms and the ONC's functionality-based, technology-agnostic definition of interoperability. We used logistic regression models to assess the relationship between health systems' organizational forms and interoperability engagement, controlling for hospital characteristics. Results We found that interoperability engagement varied greatly across hospitals in different health system structures, with facilities in more centralized health systems more likely to be interoperable. Hospitals in one system type, featuring centralized insurance product development but diverse service offerings across member organizations, had significantly higher odds of being engaged in interoperable data sharing in our multivariate regression results. Discussion The heterogeneity in health system interoperability engagement indicates that incentives to share data vary greatly across organizational strategies and structures. Our results suggest that Horizontal Consolidation in the hospital industry may not bring significant gains in interoperability progress unless that Consolidation takes a specific business alignment form. Conclusion Policymakers should be wary of claims that Horizontal Consolidation will lead to interoperability gains. Future research should explore the specific mechanisms that lead to greater interoperability in certain health system organizational structures.

  • assessing the impact of health system organizational structure on hospital electronic data sharing
    Academy of Management Proceedings, 2018
    Co-Authors: Jay A Holmgren, Eric W Ford
    Abstract:

    Horizontal Consolidation in the hospital industry has continued to gain momentum in the United States despite concerns over rising costs and lower quality. Hospital systems often justify their merger and acquisition behavior by highlighting improved ability to control costs with interoperability, the electronic sharing of patient information, across member institutions. Previous research has shown that while the overall level of interoperability engagement is low, hospitals’ that are members of health care systems are more likely to share data electronically. We sought to determine whether health system structures are associated with hospital engagement in interoperability. We used national hospital data and combined existing taxonomies of health system structure to the functionality-based, technology-agnostic definition of interoperability promulgated by the Office of the National Coordinator for Health IT. We found that interoperability engagement varied greatly across hospitals using different system s...

Balasubramaniam Aramugam - One of the best experts on this subject based on the ideXlab platform.

  • Prefabricated Vertical Drain (PVD) and Deep Cement Mixing (DCM)/Stiffened DCM (SDCM) techniques for soft ground improvement
    Institute of Physics Publishing, 2018
    Co-Authors: Bergado Dennes, Long P, Chaiyaput S, Balasubramaniam Aramugam
    Abstract:

    Soft ground improvement techniques have become most practical and popular methods to increase soil strength, soil stiffness and reduce soil compressibility including the soft Bangkok clay. This paper focuses on comparative performances of prefabricated vertical drain (PVD) using surcharge, vacuum and heat preloading as well as the cement-admixed clay of Deep Cement Mixing (DCM) and Stiffened DCM (SDCM) methods. The Vacuum-PVD can increase the Horizontal coefficient of Consolidation, Ch, resulting in faster rate of settlement at the same magnitudes of settlement compared to Conventional PVD. Several field methods of applying vacuum preloading are also compared. Moreover, the Thermal PVD and Thermal Vacuum PVD can increase further the coefficient of Horizontal Consolidation, Ch, with the associated reduction of kh/ks values by reducing the drainage retardation effects in the smear zone around the PVD which resulted in faster rates of Consolidation and higher magnitudes of settlements. Furthermore, the equivalent smear effect due to non-uniform Consolidation is also discussed in addition to the smear due to the mechanical installation of PVDs. In addition, a new kind of reinforced deep mixing method, namely Stiffened Deep Cement Mixing (SDCM) pile is introduced to improve the flexural resistance, improve the field quality control, and prevent unexpected failures of the Deep Cement Mixing (DCM) pile. The SDCM pile consists of DCM pile reinforced with the insertion of precast reinforced concrete (RC) core. The full scale test embankment on soft clay improved by SDCM and DCM piles was also analysed. Numerical simulations using the 3D PLAXIS Foundation finite element software have been done to understand the behavior of SDCM and DCM piles. The simulation results indicated that the surface settlements decreased with increasing lengths of the RC cores, and, at lesser extent, increasing sectional areas of the RC cores in the SDCM piles. In addition, the lateral movements decreased by increasing the lengths (longer than 4 m) and, the sectional areas of the RC cores in the SDCM piles. The results of the numerical simulations closely agreed with the observed data and successfully verified the parameters affecting the performances and behavior of both SDCM and DCM piles.Full Tex