STABILITY OF TRENCH EXCAVATION UNDER CONSTRUCTION MACHINERY LOAD

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  • 建設機械荷重作用下における掘削溝法面の安定性に関する研究
  • ケンセツ キカイ カジュウ サヨウ カ ニ オケル クッサク コウ ノリメン ノ アンテイセイ ニ カンスル ケンキュウ

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Abstract

There are many labor accidents in which workers or operators are buried under collapsed earth, or are injured when construction machinery such as a drag-shovel falls or topples over the edge of the trench during excavation. Our survey on labor accidents revealed that about 30 workers die every year in this type of accident. This study examined the stability of the trench excavation sites under the construction machinery load by the following procedures : 1) The load of construction machinery was modeled; 2) Failure behavior and depth of excavation were studied by conducting centrifuge model tests using an in-flight excavator, with the test parameters such as the magnitude of the machinery load, position of the load, etc.; and 3) The results from the upper bound solution based on the observed failure mechanism were compared with the failure mode in the centrifuge tests, and a good agreement was found.

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