压力隧洞裂缝混凝土衬砌和围岩的接触条件  

Contact stress between concrete linings for cracks of pressure tunnels and surrounding rock mass

作　　者：彭守拙[1] 钟建文[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《水利水电科技进展》2010年第3期53-57,共5页Advances in Science and Technology of Water Resources

摘　　要：提出裂缝衬砌和围岩之间接触应力rσ(ra)的表达式,并通过算例分析它的特性,结果表明,rσ(ra)随衬砌与围岩接触面(r=ra)处的渗透压力pa的增大由压变拉,但rσ(ra)+pa却变化不大。提出一定条件下衬砌脱开围岩独立工作的判别式,该式若满足,衬砌将脱开围岩独立工作,钢筋应力和裂缝宽度将大幅度减小。算例计算结果表明,若衬砌和围岩之间的黏结强度较小,裂缝衬砌很容易脱开围岩独立工作。A formula to calculate the contact stress between crack linings and surrounding rock mass was presented.Its behaviors were analyzed through a case.The contact stress would transform from the pressure state into the tension one with the increase of seepage pressure on the external edge of linings.However the summation of the contact stress and seepage pressure was little.Another formula to judge whether or not the linings would independently work under certain conditions was given.If the formula was satisfied,the linings would independently work and the reinforcement stress as well as the crack width would greatly decrease.The calculated results of the case indicate that the crack linings will lose contact with the rock mass and independently work if the bond strength between the concrete linings and the surrounding rock mass is very small.

关 键 词：水工压力隧洞 裂缝衬砌 围岩 接触应力 接触条件 

分 类 号：TV672.1[水利工程—水利水电工程]