考虑支护作用下的非圆形洞室应力流分布特征研究

The stress flow in non-circular cavity under support is considered distribution characteristics study

利用MATLAB数学软件编制了相应的计算程序,计算得到了含非圆形洞室围岩内部的各应力分量,并利用应力流原理对应力流分布特征进行了研究。结果表明:随着角度的增大,在拱顶处(90°)径向应力流最大,而环向应力流最小。与之相反的是,拱肩处(0°)径向应力流最小,而环向应力流最大。当支护力T由0增大至0.5时,拱顶处峰值应力由未支护状态下的1.67 MPa减小到支护下的1.34 MPa,减幅为19.8%。拱脚处峰值应力由未支护状态下的3.34 MPa减小到支护下的2.17 MPa,减幅为35.0%。

In this paper, the MATLAB mathematical software is used to prepare the corresponding calculation program, and the stress components in the surrounding rock with non-circular caverns are calculated, and the stress flow distribution characteristics are studied by using the stress flow principle. The results show: With the increase of Angle, the radial stress flow is the largest and the circumferential stress flow is the smallest at the vault(90°). On the contrary, the radial stress flow is the smallest and the circumferential stress flow is the largest at the spandrel(0°). When the support force T increases from 0 to 0.5, the peak stress at the vault decreases from 1.67 MPa without support to 1.34 MPa under support, and the reduction amplitude is 19.8%. The peak stress at the arch foot decreases from 3.34 MPa without support to 2.17 MPa under support, with a reduction of 35.0%.