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为获取在不同地应力、围岩类型以及水压下隧道突水时的最小安全岩层厚度,基于深长隧道最小安全岩层厚度概念,采用岩石的相似原理,研制了一种用于模拟突水灾害的模型试验系统,主要由主装置、模型试样压实装置和掘进装置组成,该模型试验系统可实现对不同地应力、围岩类型以及水压的模拟.研究结果表明:当试验围压、轴压设定为0.42 MPa时,水压为0.14 MPa时,获得了突水时模型最小安全隔水板厚度为31.12 mm,换算成真实岩石的厚度为3.112 m,与FLAC3D建模计算得到的最小安全隔水板厚度3.33 m比较接近,从而验证了模型试验的可靠性.
In order to obtain the minimum thickness of safe rock under different stress, surrounding rock types and water inrush under water pressure, based on the concept of minimum safe rock thickness in deep tunnel, the similarity principle of rock is used to develop a method for simulating water inrush disaster The model test system is mainly composed of main device, model sample compaction device and tunneling device. The model test system can simulate different geostress, surrounding rock type and water pressure. The results show that when test confining pressure, axis When the pressure is set to 0.42 MPa and water pressure is 0.14 MPa, the thickness of the minimum safety baffle is 31.12 mm and the actual rock thickness is 3.112 m when water inrush is obtained. Compared with FLAC3D model, the calculated minimum safety The baffle thickness of 3.33 m is relatively close, which verifies the reliability of the model test.