深埋圆形水工隧洞弹塑性应力和位移统一解  

Elastic-plastic unified solutions for stresses and displacements of a deep buried circular hydraulic tunnel

作　　者：张常光[1,2] 胡云世[3] 赵均海[4] 杨砚宗[1,2] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092 [3]衢州学院,浙江衢州324000 [4]长安大学建筑工程学院,陕西西安710061

出　　处：《岩土工程学报》2010年第11期1738-1745,共8页Chinese Journal of Geotechnical Engineering

基　　金：陕西省自然科学基金项目(SJ08E204)

摘　　要：考虑渗流体积力、中间主应力、主应力顺序、围岩应变软化和剪胀等综合影响,提出深埋圆形水工隧洞弹塑性分析的基本假定。根据假定分别建立施工期和运行期隧洞弹塑性应力和位移统一解,其中运行期又分围岩施工期处于弹性或弹塑性变形两种情况。所得统一解具有广泛的适用性,可退化为众多已有成果。通过工程算例分析,得出围岩与衬砌渗透系数比、统一强度理论参数、软化特性参数和剪胀特性参数对隧洞切向应力和位移的影响规律。研究结果表明:各参数对施工期的影响要大于运行期;围岩与衬砌渗透系数比、黏聚力软化特性参数对施工期和运行期隧洞切向应力和位移影响都很显著;考虑中间主应力的影响,可以更加充分发挥围岩的强度潜能;剪胀特性参数对隧洞位移影响明显。Taking the integrated influences of seepage volumetric force,intermediate principal stress,principal stress orders,rock strain softening and shear dilation into account,some assumptions are brought for the elastic-plastic analysis of a deep buried circular hydraulic tunnel.Based on these assumptions,the elastic-plastic unified solutions for stresses and displacements of the circular tunnel both in construction and operation periods are derived.The solutions in operation period involve two conditions that surrounding rock is elastic or elastic-plastic in construction period.The unified solutions have a wide applicability,which can naturally reduce to many existing results.With the analysis of an engineering example,the influences of the ratio of osmotic coefficient between surrounding rock and lining,unified strength theory parameter,strain softening characteristic parameter and shear dilation characteristic parameter on the tangential stress and displacements are discussed.It is shown that the effects of overall parameters in construction period are more profound than those in operation period.The influences of the ratio of osmotic coefficient between surrounding rock and lining,cohesion softening characteristic parameter on the tangential stress and displacements both in construction and operation periods are significant.The latent potentialities of surrounding rock are brought due to considering the intermediate principal stress.The shear dilation characteristic parameter is important for the displacements of tunnel.

关 键 词：深埋圆形隧洞 统一强度理论 中间主应力 渗流体积力 应变软化 剪胀 

分 类 号：TU457[建筑科学—岩土工程]