山岳トンネル地質不良区間の地霊被害と対豊工の効里

摘要

地質不良区間での山岳トンネルの地震被害に関して，被害メカニズムや新設トンネルの地質対策工の効果を解明するために研究を行った．載荷方向や構造条件を変化させた模型実験により被害を再現できた．また，背面空洞により変状が生じやすくなること，インバートにより変形や盤膨れを抑制できること，繊維補強コンクリートにより剥落を防止できること．緩衝材により変形を低減しひび割れを抑制できることがわかった．%Authors made researches to clarify the mechanisms of seismic damage and effectiveness of seismic countermeasures for newly built tunnels, concerning earthquake damage of mountain tunnels in poor geological conditions. It was revealed that actual seismic damages are able to be reproduced by the model tests, in which loading and structural conditions were modeled. Further, it was found that the void above the lining negatively affects to tunnel deformation, building the invert is able to control the deformation and heaving, fibre reinforced concrete is able to prevent concrete pieces falling from lining and the shock-absorbing member is possible to reduce deformation and cracks.