3A. Research on Upgrading Port and Airport Facilities

Background and Objectives

  • To properly maintain and develop social infrastructure such as ports and airports amid tighter financial constraints,we are developing more rational and economical design and construction methods as well as developing technologies for the maintenance and upgrading of existing facilities. Additionally, we are developing technologies for recycling byproducts, reusing rubble from earthquake disasters, and so on, in accordance with the social demand. 

Research topics

 This research theme includes the following four topics:

  1. Improvement of performance verification methods for port, harbor, and airport facilities
     We are exploring the long-term forecasting of ground behavior, ground survey techniques, characteristics of stabilized ground, simple ground improvement design assuming a level-2 earthquake, and soil assessment methods for foundation design as well as neighboring construction works. We are also maintaining programs and databases as well as improving systems.
  2. Development of techniques for upgrading port, harbor,and airport facilities
     We are developing technologies for the deepening and seismic rehabilitation of existing facilities, quality control of the hydraulic barrier in seawalls at waste disposal facilities in the sea, and so on.
  3. Promotion of Logistics Innovation
     We are examining simulations for evaluating the operations and cargo-handling machinery in various terminals including super high-standard container terminals.
  4. Development of techniques for promotion of utilization method of by-products
     We are carrying out technical development to promote the recycling and reuse of construction and industry byproducts, dredged soil, earthquake disaster wastes,tsunami debris, etc. mainly into geomaterials.

Activities in FY 2014

  • We created the standards for the triaxial test method for investigating the in situ soil shear strength and summarized how to utilize the test results as well as the results of long-term consolidation tests.
  • Using a compound model of stabilized ground, sheet piles behind the ground, and peripheral ground, we conducted a series of centrifugal model tests while changing the shape of the stabilized ground to develop and verify new evaluation and design methods including the applicability of the beam theory on elastic foundation to the subgrade reaction coefficient of sheet piles.
  • Model tests were also conducted for investigating the range of the ground that affects the bearing capacity of piles and the influence of constructing structures on nearby ground.
  • We examined and analyzed the stability of breakwater mounds and ground against tsunamis to reveal the mechanism of destabilization of breakwater foundations due to coupled overflow and seepage, and studied techniques for evaluating the stability. We also investigated the mechanism of occurrence of submarine landslides and gravity flow resulting from liquefaction through experiments and revealed the influence of the existence of fine particles and seepage flow on the development of gravity flow.
  • We established a program library and a soil property database for the ground and structure design in order to support design work.
  • We conducted centrifugal model tests simulating the construction by compaction grouting in order to perform numerical analysis and investigate the mechanism by which the effect of the improvement is manifested, deformation of ground due to the construction, and the range of influence. We also conducted dynamic centrifugal model tests to investigate the relation between the improvement rate and the suppressing effect against liquefaction.
  • We conducted centrifugal model tests simulating the construction by compaction grouting in order to perform numerical analysis and investigate the mechanism by which the effect of the improvement is manifested, deformation of ground due to the construction, and the range of influence. We also conducted dynamic centrifugal model tests to investigate the relation between the improvement rate and the suppressing effect against liquefaction.
  • We completed the construction of a general-purpose AutoMod-based container terminal simulator and created its manual. We also examined possible improvements of loading machines, storages, operation, etc. for the problems found by the simulation in FY 2013 and verified the effect of such improvements by simulation.
  • We developed a small test apparatus in order to quantitatively evaluate the tendency of shore erosion due to water flow, and we accumulated test data for a clayey soil using the apparatus.
  • We studied the compaction characteristics of classified soil. 

Figure 1.1.1.13 Clarification of the effect of coupled overflow and seepage due to a tsunami on caisson destabilization

 

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