SDCAD4.0在水工隧洞衬砌内力与配筋计算中的应用

Application of SDCAD4.0 in Hydraulic Tunnel Lining Internal Force and Reinforcement Calculation

为克服传统结构力学在水工隧洞结构计算中的不足,采用边值法计算方法,引进专用水工隧洞结构计算软件SDCAD4.0,对输水隧洞在3种工况、不同荷载组合下进行内力及配筋计算,并与理正岩土程序6.5的计算结果相比较。结果表明,输水隧洞衬砌结构在外水压力的作用下,3种工况弯矩最大值均位于边墙与底板的交接处,底板的跨中弯矩也偏大;3种工况下隧洞在边墙和底板交接处出现较大的拉应力和压应力,抗剪力也很难满足要求;2种不同软件计算所得内力结果接近,但理正岩土程序6.5选筋结果偏大,选筋较为保守,SDCAD4.0软件在选筋上较为经济合理。

To overcome the shortcomings of traditional structural mechanics in hydraulic tunnel structure calculation,based on the boundary value method,the special hydraulic tunnel structure calculation software SDCAD4.0 was used to calculate internal force and reinforcement of water conveyance tunnel under three working conditions and different load combinations.Compared with the results obtained by the Lizheng geotechnical program 6.5,it shows that under the action of water pressure,the maximum bending moment is on the joint of side wall and floor for three kinds of working conditions.The floor of midspan moment is also larger;Under three working conditions,the tunnel appears large tensile stress and compressive stress on the side wall and floor,and the shear force is difficult to meet the requirements;The results of internal forces calculated by the two different software are similar,but the result of reinforcement selection by the Lizheng geotechnical program 6.5 is relatively large and conservative,and the SDCAD4.0 software is relatively economical and reasonable in reinforcement selection.