## 1 Introduction  
At present, bolt support is widely used as permanent support during the tunneling of fully mechanized roadway in coal mines, and temporary support must be provided to prevent the roof caring of the tunneling face before the bolt support. At present, a number of front probe beams are generally suspended on the roof bolts along the roadway as temporary supports. The front probe beams extend forward to the empty roof area to protect the roof and prevent personal injury and death caused by roof fall. With the above support method, the initial support force cannot be applied to the roof, the support range is limited, it is impossible to work in parallel with the roadheader [1], the reliability is poor [2], the support efficiency is low [3,4], and the safety hazard is large [5]. To solve this problem, scholars and enterprises have proposed various types of machine-mounted or self-moving temporary supports, but due to their own structure, they have not been widely used [6].  
The geological conditions of a tunneling roadway are complex, the roof is uneven, there are many equipment and personnel in the roadway, and the space is narrow [7]. Based on the above situation, we propose a self-moving temporary support method based on the analysis of the mechanical characteristics of the wall rock of the roadway and build a numerical simulation method for the mechanical characteristics of the support and a multiobjective optimization method for the key components based on it.  
The existing research similar to our study mainly focuses on the integrated equipment such as machine-mounted temporary support and mining-tunnelling-anchoring integrated machine. These devices are highly automated, but because they are integrated with other equipment, they have high space requirements. At the same time, due to the simple support structure, they cannot adapt to the actual working conditions of complex geological conditions and an uneven roof. This paper plans to solve the problem of the temporary support of roadways with complex geological conditions. On the basis of a mechanical analysis of the wall rock support system and a numerical simulation of the support pressure, a self-moving temporary support (SmTS) suitable for uneven roadway roof is constructed, and its mechanical characteristics are analyzed. A multiobjective optimization method for key components based on response surface methodology (RSM) is constructed to optimize and analyze the key components of the support. The application of our research can realize the efficient and reliable temporary support of a tunneling roadway and provide a temporary support method in the process of coal mine roadway tunneling, which can solve the problems of low efficiency, poor reliability, and large potential safety hazards of the temporary support of a tunneling roadway.  
The remainder of the paper is organized as follows. Section 2 reviews the literature relating to the temporary support of roadway and its relevant analysis and optimization. In Section 3, the mechanical analysis and numerical simulation of the wall rock support system of the tunneling roadway is introduced. A self-moving temporary support method is constructed in Section 4. In Section 5, the multiobjective optimization of the main beam is carried out, followed by a conclusion in Section 6.