结合沪蓉西八字岭分岔式隧道三维地质力学模型试验,将静态电阻应变技术和光纤应变测试技术应用于地质力学模型试验中,并通过应变测试得到洞室周围关键点主应力的大小和方向.同时将试验测试结果与数值模拟结果进行对比分析,取得了较好的一致性.试验结果证明,只有将电阻应变片测试技术和光纤应变测试技术有机结合,才能得到较好的试验数据. Combined with the three-dimensional geomechanical model test of the West Barker Ridge Bifurcated Tunnel in Shanghai City, the static resistance strain and optical fiber strain tests are applied to the geomechanical model tests. The magnitude and direction of the principal stress at the key points around the cavern are obtained through the strain test At the same time, the results of the test and the numerical simulation are comparatively analyzed, and the better agreement is obtained.The experimental results show that only good combination of the resistance strain gage testing technology and the optical fiber strain testing technology can obtain the better test data.