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Behavior of Treated-Soil-Slab on Extermely Weak Ground

Publication year

Port and Airport Research Institute　Technical Note　0431　1982.09

Author(s)

ZHANG Wen Quan,Hiroyuki TANAKA,Masaaki TERASHI

Department
/Divison

Soils Division Soil Stabilization Laboratory

Executive Summary

In Japan, many reclamation projects are carried out using soft sea bottom sediment as fill material. If it is required to utilize such a reclamation urgently, deep soil improvement is necessary before construction. But in some cases, it is difficult even to spread sand mat on a ground surface because of its extreme low strength. Surface treatment by means of synthetic fibre or by admixture stabilization has become a common practive recently.
　In the paper, the behavior of treated-soil-slab formed on an extremely weak ground for temporary purposes; e.g. temporary access road, is studied. Current design method of the slab is based on the assumption that the slab behaves as if it is anelastic beam resting on the Winkler medium. From a series of small scale model tests, it is known that the current design method gives a good estimate of maximum bending stress in the slab due to external loading if the modulus of subgrade reaction, k is rigorously determined. As is known, however, k is not a unique value of the soil but is affected by various factors such as the shear strength and thickness of the soil, dimension and stiffness of the slab, magnitude of loading. The precautions in the selection of design parameters are discussed based on the test results.

PDF File

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