Automatic iteration method and fast determination device for critically stable section of tunnel

Abstract

The invention provides an automatic iteration method and a fast determination device for a critically stable section of a tunnel. The method includes: Step 1. Parameter setting; Step 2. Parametric modeling; Step 3. Calculating the safety factor; Step 4. Judging the safety after this iteration Whether the coefficient is equal to the target value, if so, the iteration terminates, otherwise calculate the size adjustment ratio of the next iteration; Step 5. Calculate the tunnel radius of the next cycle according to the size adjustment ratio, repeat 2 to 4 until it is judged to be equal; Step 6. Calculate the maximum displacement and judge whether the allowable displacement requirements are met. If so, the iteration ends and a critical stable section is obtained; otherwise, enter the second stage of iteration, and the iteration target is the allowable displacement; Step 7. Specify the upper and lower limits of the radius; Step 8. Calculate Maximum displacement; Step 9. Judging whether the maximum displacement meets the requirements, if so, the iteration is terminated, and the critical stable section is obtained; otherwise, the upper and lower limits are updated; Step 10. Repeat 8-9 until convergence.

Description

technical field [0001] The invention belongs to the field of tunnel engineering, and in particular relates to an automatic iteration method and a fast determination device for a critical stable section of a tunnel. Background technique [0002] During the construction of tunnel engineering, whether the surrounding rock is stable and the degree of stability is very important to the safety of construction personnel and equipment. Theoretically, for the same level of surrounding rock, the larger the cross-sectional area or span of the tunnel, the worse the stability of the surrounding rock, and the smaller the cross-sectional area or span of the tunnel, the better the stability of the surrounding rock. Therefore, the existing research has proposed the concept of the critically stable section of the tunnel, that is, the buried depth of the center of the designed excavation section is the same, the geometric shape is similar, and it can achieve self-stabilization with the design ...

AI Technical Summary

Problems solved by technology

[0004] 1. It is necessary to manually adjust the size of the tunnel and repeatedly establish a numerical model for calculation. The calculation process is cumbersome, time-consuming and inefficient

[0005] 2. The upper and lower limits for size adjustment need to be determined in advance, and the calculation workload is heavy

[0006] 3. The allowable deformation of the tunnel is not considered, which may cause the obtained tunnel deformation of the critically stable section to exceed the allowable value, resulting in unreasonable calculation results

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