浅埋岩体隧洞初始地应力场位移反分析方法研究

对于隧洞开挖数值计算问题,能否合理的模拟初始地应力场是技术关键.由于在浅埋岩体隧洞数值计算过程中,初始地应力场控制隧洞围岩变形规律,岩体力学参数控制围岩变形大小.根据初始地应力场的数值计算方法,假设垂直方向的初始地应力为岩体自重,在考虑两个水平方向的初始地应力不相等基础上,提出了以开挖相对位移比例和开挖相对位移增量比例为对象的浅埋隧洞初始地应力场反分析方法,并且通过-简单隧洞反分析实例,说明了该方法简单易行、结果合理,符合工程实际.

Displacement Back Analysis of Initial Sresses Filed of Shallow Rock Masses Tunnel

According to the numerical simulation method of initial stresses filed,and based on the assumptions that vertical initial stress is equal to gravity stress of rock masses,and two direction horizontal initial stresses are not equivalent an initial stresses field back analysis method which used the object of the excavation relative displacement ratio and the excavation relative displacement increment ratio for shallow tunnel was put forward.Through a back analysis example of a shallow tunnel,the results showe...