The Experts below are selected from a list of 48 Experts worldwide ranked by ideXlab platform

Nicholas Joseph Lafronz - One of the best experts on this subject based on the ideXlab platform.

  • rockfill embankment Settlement sugarloaf mountain bridge abutment and hoover dam bypass us 93
    Transportation Research Record, 2007
    Co-Authors: Scott A Anderson, Nicholas Joseph Lafronz
    Abstract:

    The Hoover Dam Bypass project (US-93) crosses the Colorado River between Arizona and Nevada below Hoover Dam, 30 mi southeast of Las Vegas, Nevada. The Arizona approach to the river includes the seven-span, 900-ft long Sugarloaf Mountain Bridge. The east bridge abutment footing is supported on a welded-wire-reinforced, special embankment fill zone within a 130-ft high rockfill embankment. Reinforced zone backfill consists of 4-in. maximum size select granular backfill; the remainder of the embankment consists of 2-ft maximum size rock. Backfill and rockfill were obtained from project roadway cuts, and construction and acceptance of the reinforced zone and rockfill embankment were in accordance with FHWA standard specifications and project special provisions. Postconstruction Settlement of the embankment was monitored for 2 years with conventional survey monuments on abutment wingwalls and the embankment and multipoint borehole extensometers (MPBX) in the roadway shoulders. The monitoring period included 3...

Yanlin Zhao - One of the best experts on this subject based on the ideXlab platform.

  • effect of vacuum removal on consolidation Settlement under a combined vacuum and surcharge preloading
    Geotextiles and Geomembranes, 2019
    Co-Authors: Pengpeng Ni, Kai Xu, Yanlin Zhao
    Abstract:

    Abstract The combined vacuum and surcharge preloading technique is extensively used to accelerate the consolidation process of subsoils. The effect of vacuum pressure is often considered as a loading/unloading cycle of mean effective stress, such that elastic rebound occurs after vacuum removal, which cannot explain the observed Postconstruction Settlement in the field. In this study, the stress state of subsoils subject to vacuum and surcharge preloading is analyzed and decomposed into two components: (a) geostatic consolidation at a different depth, and (b) loading/unloading in the minor principal stress direction. A series of consolidated drained triaxial tests is conducted to simulate the soil behaviour after vacuum removal. Results show that the contribution of unloading in the minor principal stress direction outweighs the magnitude of elastic rebound after vacuum removal, and hence continued Settlement dominates. A field case for highways is provided to further demonstrate the proposed mechanism.

Scott A Anderson - One of the best experts on this subject based on the ideXlab platform.

  • rockfill embankment Settlement sugarloaf mountain bridge abutment and hoover dam bypass us 93
    Transportation Research Record, 2007
    Co-Authors: Scott A Anderson, Nicholas Joseph Lafronz
    Abstract:

    The Hoover Dam Bypass project (US-93) crosses the Colorado River between Arizona and Nevada below Hoover Dam, 30 mi southeast of Las Vegas, Nevada. The Arizona approach to the river includes the seven-span, 900-ft long Sugarloaf Mountain Bridge. The east bridge abutment footing is supported on a welded-wire-reinforced, special embankment fill zone within a 130-ft high rockfill embankment. Reinforced zone backfill consists of 4-in. maximum size select granular backfill; the remainder of the embankment consists of 2-ft maximum size rock. Backfill and rockfill were obtained from project roadway cuts, and construction and acceptance of the reinforced zone and rockfill embankment were in accordance with FHWA standard specifications and project special provisions. Postconstruction Settlement of the embankment was monitored for 2 years with conventional survey monuments on abutment wingwalls and the embankment and multipoint borehole extensometers (MPBX) in the roadway shoulders. The monitoring period included 3...

Pengpeng Ni - One of the best experts on this subject based on the ideXlab platform.

  • effect of vacuum removal on consolidation Settlement under a combined vacuum and surcharge preloading
    Geotextiles and Geomembranes, 2019
    Co-Authors: Pengpeng Ni, Kai Xu, Yanlin Zhao
    Abstract:

    Abstract The combined vacuum and surcharge preloading technique is extensively used to accelerate the consolidation process of subsoils. The effect of vacuum pressure is often considered as a loading/unloading cycle of mean effective stress, such that elastic rebound occurs after vacuum removal, which cannot explain the observed Postconstruction Settlement in the field. In this study, the stress state of subsoils subject to vacuum and surcharge preloading is analyzed and decomposed into two components: (a) geostatic consolidation at a different depth, and (b) loading/unloading in the minor principal stress direction. A series of consolidated drained triaxial tests is conducted to simulate the soil behaviour after vacuum removal. Results show that the contribution of unloading in the minor principal stress direction outweighs the magnitude of elastic rebound after vacuum removal, and hence continued Settlement dominates. A field case for highways is provided to further demonstrate the proposed mechanism.

Kai Xu - One of the best experts on this subject based on the ideXlab platform.

  • effect of vacuum removal on consolidation Settlement under a combined vacuum and surcharge preloading
    Geotextiles and Geomembranes, 2019
    Co-Authors: Pengpeng Ni, Kai Xu, Yanlin Zhao
    Abstract:

    Abstract The combined vacuum and surcharge preloading technique is extensively used to accelerate the consolidation process of subsoils. The effect of vacuum pressure is often considered as a loading/unloading cycle of mean effective stress, such that elastic rebound occurs after vacuum removal, which cannot explain the observed Postconstruction Settlement in the field. In this study, the stress state of subsoils subject to vacuum and surcharge preloading is analyzed and decomposed into two components: (a) geostatic consolidation at a different depth, and (b) loading/unloading in the minor principal stress direction. A series of consolidated drained triaxial tests is conducted to simulate the soil behaviour after vacuum removal. Results show that the contribution of unloading in the minor principal stress direction outweighs the magnitude of elastic rebound after vacuum removal, and hence continued Settlement dominates. A field case for highways is provided to further demonstrate the proposed mechanism.