## 1 Introduction  
Due to the underground engineering structures suffering a serious damage effect under the condition of explosion loading, the resistance capacity is an important index to measure the anti-explosion performance of underground engineering structures, and improving the resistance of engineering structures is the most effective protective strategy to deal with explosion loads. Therefore, it is necessary to deeply develop the study of the dynamic response characteristics and anti-explosion performance of the structures under the explosion loading. At present, the physical similarity model test is an important method to study the anti-explosion abilities of underground engineering structures under the explosion loading. However, due to the limitations of test equipment and related technologies, the \"small-scale structure tests\" are usually used to test the anti-explosion resistance of prototype structures, or as an experimental validation for calibrating the theoretical calculation results, and the problems, such as boundary effects, structural influence areas, and floor reflection effects, that commonly exist in model experiments. Therefore, it is unclear whether the structural response characteristics and damage effects are consistent with prototype tests or not. Comparing with the physical similarity model test, the field high-pressure plane charge test is usually designed as an anti-explosion test for the large-scale structures or prototype structures, thus the problem of \"small scale\" in the similar model tests can be solved, and the peak pressure and positive pressure duration in the middle and far regions under the explosion loading can be accurately simulated. As the main structural type of underground engineering, research on the anti-explosion performance of straight-wall-arch structures is an urgent problem for the anti-explosion design and the selection of the underground engineering structures under the explosion loading. For a long time, the underground structure has been mainly composed of a surrounding rock reinforcement layer and a reinforced concrete support structure. For a few tunnels with low resistance requirements and good surrounding rock quality conditions, the surrounding rock reinforcement layer can effectively improve the characteristics of the surrounding rock, and prevent the occurrence of fractures, falling rocks and flying rocks on the free face of the rough tunnel. [PERSON] [1] systematically reviewed and discussed the main research on the development and engineering applications of the nonlinear stress wave propagation theory over the past half century, and applied the plane wave loading technology with high pressure, large area and controllable waveform in the rock mass, and gave the attenuation law of peak stress with propagation distance under the plane charge explosion loading. In order to study the dynamic characteristics of reinforced concrete slabs under the near-plane explosion loads, [PERSON] [2] developed a special test device to simulate the plane charge explosion technology (PET), and successfully simulated the intensity and duration of the near-plane explosion loads in 0.1-0.4 MPa and 85-135 ms, respectively. In the research of the surrounding rock reinforcement layer, [PERSON] [3] used a physical simulation test to study the influence of different anchorage strategies of the chamber structure under the plane charge explosion loading on the anti-explosion effect, and discovered that the locally lengthened dense anchor bolt support at the arch spring could effectively prevent or block the development of cracks in the surrounding rock and force the cracks to bypass the anchoring zone, which resulted in improving the explosion resistance capacity of the anchorage chamber.