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논문 기본 정보

자료유형
학술저널
저자정보
Yang, X.L. (School of Civil Engineering, Central South University) Xu, J.S. (School of Civil Engineering, Central South University) Li, Y.X. (School of Civil Engineering, Central South University) Yan, R.M. (School of Civil Engineering, Central South University)
저널정보
테크노프레스 Geomechanics & engineering Geomechanics & engineering 제10권 제1호
발행연도
2016.1
수록면
21 - 35 (15page)

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Employing non-associated flow rule and Power-Law failure criterion, the failure mechanisms of tunnel roof in homogeneous and layered soils are studied in present analysis. From the viewpoint of energy, limit analysis upper bound theorem and variation principle are introduced to study the influence of dilatancy on the collapse mechanism of rectangular tunnel considering effects of supporting force and seepage force. Through calculation, the collapsing curve expressions of rectangular tunnel which are excavated in homogeneous soil and layered soils respectively are derived. The accuracy of this work is verified by comparing with the existing research results. The collapsing surface shapes with different dilatancy coefficients are draw out and the influence of dilatancy coefficient on possible collapsing range is analyzed. The results show that, in homogeneous soil, the potential collapsing range decreases with the decrease of the dilatancy coefficient. In layered soils, the total height and the width on the layered position of possible collapsing block increase and the width of the falling block on tunnel roof decrease when only the upper soil's dilatancy coefficient decrease. When only the lower soil's dilatancy coefficient decrease or both layers' dilatancy coefficients decrease, the range of the potential collapsing block reduces.

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