【摘要】 根据牛场古地下洞室群1号洞顶板的拉裂现象,利用Ansys建立与牛场古地下洞室群初始及边界条件相符的模型,通过FLAC-3D计算获得拉裂缝所在单元垂直裂缝方向的拉应力范围,即0.037～0.469 MPa。由于顶板拉裂缝是经过长期变形而产生的,结合材料力学第一强度理论,该范围可以作为牛场古地下洞室群1号洞顶板围岩的长期抗拉强度。更多还原

【Abstract】 The authors present a new method to estimate long-term tensile strength according to tensile cracks on roof of No.1 cave in Niuchang ancient underground caverns.Firstly,a model based on true initial and boundary conditions of Niuchang ancient underground caverns is established by Ansys,and then the range of tensile stress in cracked elements and perpendicular to cracks is obtained by FLAC-3D calculation,as 0.037-0.469 MPa.Because cracks in the roof occur after long time stress,and according to theory of strength I of material mechanics,such range can be regarded as roof long-term tensile strength in No.1 cave of Niuchang ancient underground caverns.更多还原