裂隙岩体硐室抗爆稳定性影响参数

Parameters Influencing Anti-explosion Stability of Fractured Rock Caverns

为研究裂隙岩体硐室抗爆稳定性的影响因素,采用Froude相似理论开展不同隙跨比硐室的抗爆模型试验,分析不同工况下围岩压力、洞壁位移及应变的变化规律,通过数值模拟对试验结果进行验证,进一步探究节理范围、倾角以及爆点位置对硐室抗爆稳定性的影响.研究结果表明:隙跨比对硐室抗爆稳定性的影响较大,其中,隙跨比大的硐室未出现明显损伤,整体稳定性较好,隙跨比小的硐室的破坏现象较为严重;数值模拟与模型试验的结果较为一致,证明研究方法的合理性和可行性;侧邦及底板处节理范围的改变对硐室抗爆稳定性的影响较小,拱部节理倾角的增加可提高硐室的抗爆稳定性;在结构面倾向边爆炸时,模型硐室的破坏最为严重.所得结果可为地下工程选址以及支护提供一定的参考.

In order to study the factors influencing the anti-explosion stability of the tunnel with fissure rock mass,Froude similarity theory is used to carry out the anti-explosion model test of the tunnel with different gap and span ratios,and the variation rules of surrounding rock pressure,tunnel wall displacement and strain under different working conditions are analyzed.Numerical simulation is used to verify the test results,and to further explore the influence of joint range,angle and location of explosion point on anti-explosion stability of the chamber.Results show that the gap span ratio has a great influence on the anti-explosion stability of the cavern.The chamber with a large gap span ratio has no obvious damage and the overall stability is better,while the failure of the chamber with a small gap span ratio is more serious.The results of numerical simulation and model test are in good agreement,and the research method is reasonable and feasible.The change of the joint range at the side and bottom plate has almost no effect on the anti-explosion stability of the chamber,and the increase of the arch joint angle can improve the anti-explosion stability of the chamber.The damage of the model chamber is the most serious when the inclined side explosion occurs.The results can provide some references for the site selection and support of underground engineering.