ken08203

NAME“MOTOMU MANDOKORO

TITLE“Mechanical characteristic of crushing mudstone material that contains volcanic cohesive soil

Guidance teacher“Satoru Ohtsuka

Outline

A large amount of weak materials such as mudstones are generated the tunneling work in the mountains region and increasing in road works etc﹞ and the disposal of waste soil becomes a problem in recent years‘The construction case with high fills that use the mudstone has increased as one that uses the surplus soil method, and when consolidated power uses it as a banking material of a small mudstone, the influence of the deterioration of strength by , slaking etc. and the subsidences becomes a problem soaking the particle breakage and the water when well-set is hardened‘Moreover, the gap increases easily when it produces hard in massiveness when digging, and this is used as a fill material, and if it is made minute grain by the change of the groundwater level for a long term, a weak rock might cause the compression subsidence of the fill‘Therefore, to make few fills of the gap from the crushing surface compaction with a large-scale vibratory roller etc. as much as possible, it is considered on an actual construction site‘However, a plain standard of the size of the mudstone mass when digging (crushing diameter) has not been installed though a concrete standard concerning the density management has been installed‘Then, it paid attention to "Crushing diameter" of the mudstone used when constructing it, and water was investigated about no influence with three axis compression examination machine soaking the rise of the rainfall after it constructed it of the soil compaction characteristic and strength immediately after construction and the groundwater level‘The material degradation and the slaking are intense materials that the material used is a crushing mudstone material gathered in the vicinity of the national road of the Niigata prefecture, and contain the volcanic cohesive soil. The following findings were obtained from the test outcome‘
迭 A different characteristic is seen by the difference of "Crushing diameter" before the test piece is made in the soil compaction characteristic, non-water influx strength characteristic, and the water influx strength degree characteristic‘2mm diameter of non-water influx strength is smaller than 19mm diameter. However,However, 2mm diameter tends the water influx strength decreasing rate smaller than 19mm diameter.
迫 Hardening well-set to the density in the design standard should do nature and a certain constant initial load (consolidation before water influx) to prevent the deterioration of strength for water influx recording be done. The fill amount is raised when this is replaced with the problem of the site, a large fill of the effective overburden pressure will be constructed, and this is practiced in an existing embankment design that uses a weak rock‘ However, the drainpipe reason for the fill is basically important because the compression subsidence damage of the fill is frequently reported in a high construction of embankment that uses a weak rock‘
迤 Even if it compares and big hydraulic pressure recording is done, the collapse of the mass is not easily seen in the nature content. state of ratio under the action repeating dry and wet even if it is a crushing mudstone made minute grain‘

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