基于某隧道岩石Kaiser效应测试及区域应力场数值分析

Based on a Certain Tunnel Sandstone Kaiser Effect Test and the Regional Stress Field Numerical Analysis

用美国产MTS815程控伺服岩石刚性试验机和AE210声发射测试系统,对6个不同方向的隧道主洞定向砂岩样进行单轴压缩试验;同时测定岩样在受压过程中产生的声发射信号。通过能量累计(对数)、振铃计数、荷载与到达时间的关系图,导入CAD,综合选定6个方向Kaiser效应点。根据弹性力学理论基础,用工程Maple软件计算出3个主应力的大小和方向。为了验证该方法选取特征点计算结果的可靠性,用有限元Phase软件对工程区区域构造应力场特征进行数值分析。结果表明:试验测试值与应力数值模拟值较相近,说明声发射试验结果可靠;并得出该隧道现代地应力场基本应力值为14.48 MPa,应力场方向为EW向,此结果对隧道设计和施工有十分重要的意义。

The in-situ stress of sandstone is taking American-programmed servo rigid rock testing machine with MTS815 and AE210 acoustic-emission testing system for six different directions of the main tunnel hole direction alsandstone samples under uniaxial compression test, and measuring the rock samples which generate AE signals inthe compression process. Through the diagram of accumulated energy ( logarithmic) , ring count, load and arrivaltime, them were imported in CAD, and complex selected 6 directions, Kaiser effect points. According to elasticitytheory foundation, engineering Maple software was used to calculate the size and direction of the three principalstress. In order to verify the calculation method reliability of the results of the selected feature, finite element softwareof Phase was utlized to do the numerical analysis of regional tectonic stress in the project area. The resultsshow that the acoustic-emission tests ’ results are reliable because the tests are close to that of numerical simulation stress. And acquiring the tunnel,sin-situ stress is 14. 48 MPa and direction is east-west of the modem in-situ stress field, which has a very important significance of the tunnel, s design and construction.