Abstract
To enhance the antidynamic and static load resistance of reinforced concrete structures, the measure of covering steel plates on the inner surface of concrete structures arises, which has been rapidly developed and applied in civil engineering and other fields and has achieved a good performance. A new shaft wall structure consisting of steel plate reinforced concrete has been widely used in shaft of deep mining. In order to investigate the stability and obtain the optimum structure parameters of the new shaft structure, the numerical software of LS-DYNA was used to analyze the influences of different factors, including the explosive payload, steel plate thickness, concrete strength grade, and the included joint angle between two plates, on the stability of steel plate reinforced concrete structures. After the verification of the accuracy of numerical simulation results, 23 simulation schemes were proposed and numerically calculated. For all the tests, the principal tensile stress and particle vibration velocity were, respectively, chosen as the failure criteria to evaluate the impacts of those four factors. The results indicate that a quadratic function can be well used to describe the relationships between each factor and both the principal tensile stress and particle vibration velocity. Based on the results, the optimum structure parameters were finally determined, which are suggested as 250 kg, 15 mm, C85, and 40° for the explosive payload, steel plate thickness, concrete strength grade, and joint angle, respectively. The research results can provide a certain theoretical basis and design guidance for solving the problem of water leakage of single-layer shaft wall structures.
Highlights
With the depth increase of coal mine in China, great breakthrough has been made in the deep freezing technology
The new shaft wall structure, which consists of the concrete body and steel joint plates, is bound to replace the past unreasonable single wall structure which is a superthick and simple structure. e key technology to ensure the integrity and water resistance is how to avoid the failure in concrete and along the interface between the concrete and steel plate under an applied explosive load [1, 2]. e main methods used to study the issue include model test and numerical simulation
Based on the study on the bend and failure modes of both the beam and plate structure under an applied explosive load, a simplified resistance model and an equivalent system of degree of freedom (DOF) of the beam and plate were proposed [3,4,5,6]. e reliability of the numerical simulation was proved by comparing the numerical simulation results using the finite element method (FEM) software and the real explosion tests of the dynamic response of concrete under an applied explosive load [7, 8]. e dynamic response of the concrete wall under explosion effects was obtained [9], and similar studies have been conducted by other reports [10, 11]. e deformation rules of concrete walls under an explosive load were gained from the numerical simulation
Summary
With the depth increase of coal mine in China, great breakthrough has been made in the deep freezing technology. Advances in Civil Engineering using the software of ANSYS/LS-DYNA [12, 13], and the dynamic response characteristics and failure patterns of the reinforced concrete slab subjected to an applied explosive load were investigated using both the experimental tests and FEM simulations [14,15,16] All those reports used numerical simulations as an important means to analyze the mechanical properties of concrete under explosion. The reliability and accuracy of numerical simulations have been verified Many works, including both the theoretical calculation and numerical simulation, have been conducted to study the mechanical and stability characteristics of steel plate reinforced concrete (SPRC) structure under an applied explosive load.
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