地下沼气池池壁土压力取值方法及池盖受力分析

摘要

为保证地下沼气池结构的安全性,采用Rankine土压力理论比较了3种常见土质的静止、主动和被动土压力,并确定了地下钢筋混凝土圆形沼气池池壁土压力取值方法;根据线弹性有限元分析方法,研究了平板、球壳和圆锥台3种不同形状的沼气池池盖受力性能.结果表明:地下沼气池池壁土压力宜取其静止土压力计算;环梁的设置可以使中部开圆形洞口的圆锥台形池盖的最大应力减小约40%,宜为其设置环梁.%In order to ensure the security of underground biogas digester structure, the static, active and passive earth pressure of three kinds of soil were compared based on Rankine earth pressure theory, and earth pressure value on pool wall of underground biogas digester was determined. According to linear elastic finite-element analysis, the mechanical behavior of three different pool covers, such as slab, shell and truncated cone, were analyzed. The results showed that the earth pressure on pool wall could be considered as static earth pressure, and ring beam can make the maximum stress of truncated cone pool cover with circular opening decrease by 40％. It is necessary to set ring beam with it.