基于安全度指标的隧洞围岩稳定性判别和量化评估方法

• Format: Patent
• Language: Chinese
• Published: 26.04.2024
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

本发明公开了一种基于安全度指标的隧洞围岩稳定性判别和量化评估方法，通过采用掌子面持续推进的模拟方法，实现不同条件下的隧洞开挖支护三维数值仿真，获得围岩塑性区深度、掌子面后方围岩变形、锚杆最大拉应力和钢拱架最大压应力，并分别计算这些指标与最大允许值的比值，从而得到对应指标的安全度，实现隧洞围岩稳定性的判别。然后，计算表征围岩稳定程度的综合量化指标，从而实现不同条件下的围岩稳定性量化评估。该方法计算及评估结果准确度高，能快速、准确地评估出隧洞围岩综合安全度。 The invention discloses a tunnel surrounding rock stability discrimination and quantitative evaluation method based on a safety degree index, which realizes tunnel excavation support three-dimensional numerical simulation under different conditions by adopting a tunnel face continuous propulsion simulation method. The depth of a surrounding rock plastic zone, deformation of surrounding rock behind a tunnel face, the maximum tensile stress of an anchor rod and the maximum pressure stress of a steel arch are obtained, and the ratio of the indexes to the maximum allowable value is calculated, so that the safety degree of the corresponding indexes is obtained, and the stability of the tunnel surrounding rock is judged. And then, calculating a comprehensive quantitative index representing