基于广义Hoek-Brown屈服准则的圆形巷道围岩弹塑性力学分析

考虑不同巷道埋深对支护压力的影响,采用广义Hoek-Brown屈服准则对圆形巷道围岩进行弹塑性力学分析。利用在弹塑交界处应力连续的条件及巷道周边的应力边界条件,得到了塑性区的应力和巷道的支护压力与原岩应力之间的解析式。研究表明:塑性区的应力和巷道的支护压力不仅与本身的力学特性有关,而且还与原岩应力有关;并针对质量较差的软岩,分析了在不同支护压力条件下巷道所能承受的最大原岩应力及其所对应的最大的埋深。分析结果表明:支护压力与原岩应力及其所对应的巷道埋深存在明显的线性关系。

Elastoplastic analysis of surrounding rock on circular roadway based on generalized Hoek-Brown yield criterion

Generalized Hoek-Brown criterion is used as elasto-plastic analytical method of circular roadway and by considering different depth of roadway on support pressure effect.Using the conditions that the stresses are continuous at the elastic-plastic interface and periphery of roadway,the computational formulae among plastic stress , support pressure and in-situ stress are obtained. The studies show that the plastic stress and support pressure are not only related to the mechanical properties of itself but also in-situ stress. According to the poor quality of the soft rock, Analyzed the roadway can bear the biggest in-situ stress and the corresponding maximum depth under the condition of the different supporting pressure, It is well worth notice that the in-situ stress and the depth of roadway have significant linear relationship with the support pressure.