## 1 Introduction  
Based on the development trend of China's excavation and mining technology and the actual needs of coal mining enterprises for solid waste treatment and section coal pillar resources recovery, academician [PERSON] proposed the integrated 'excavation-backfill-retention' tunneling method for section coal pillar extraction [1], which can realize the collaborative operation of \"roadway excavation, solid waste disposal, and section coal pillar resources recovery\". The new method employs a set of advanced comprehensive mining equipment for short-wall working face excavation, continuously and efficiently filling behind the excavation face. Overall, it replaces the section coal pillar with waste rock, while automatically leaving two side lanes along the filling belt, achieving tunnel excavation, waste rock disposal, and section coal pillar resource recovery. Temporary support is an indispensable process in roadway excavation, which can ensure the safety and stability of the roof in the area between the drilling head and permanent support [2]. Compared with the permanent support of general roadways, the temporary support strength is far lower than the permanent support strength [3,4]. Therefore, realizing safe and stable temporary support during face section coal pillar excavation is an important engineering problem in integrated 'excavation-backfill-retention' mining. Currently, most of the temporary support equipment used in coal mine roadway excavation do not rely on the tunneling machine and can realize autonomous movement [5,6]. They can be categorized by their movement method: stepping mobile temporary support, crawler-type temporary support, and translational temporary support. The stepping mobile temporary support moves by mimicking a walking motion using independent units that alternately support, release, advance, and re-support. This adapts to complex geology and offers high strength [7]. The crawler-type temporary support uses a crawler mechanism for continuous support and advancement, improving efficiency. It is ideal for long, uniform tunnels, especially in soft soil [8]. The translational temporary support uses large frames pushed forward; during the pushing process, the support force on the roof is usually maintained. It is simple and suited for regular tunnels with good geology [9]. Regarding the stepping mobile temporary support, [PERSON] et al. [10] designed a novel advanced roadway support with a support height of 2-4 m and a support width of 3.2-4.5 m, analyzing the influence of support timing and location on roof load and deformation. This provided a basis for optimizing the support design and improving the support effect. [PERSON] et al. [11] studied the structural stability of the stepping arch advanced supporting equipment and established the multi-point distributed static model of the top support beam. Structural design optimization was carried out through simulation software to ensure the structure had better stability. [PERSON] et al. [12] proposed a novel approach for roadway excavation, support, and anchoring by utilizing the twin-link stepping mobile temporary support method, it can provide support for roadways that are 3.6 m high and 5 m wide. This method laid a theoretical foundation for implementing the parallel operation mode in underground roadway excavation in coal mines and significantly improved safety and efficiency. Regarding the crawler-type temporary support. [PERSON] [13] introduced a hydraulic-driven crawler-type tunneling support device designed for a tunneling width of 5.0 m and a support height range of 3.0 to 3.8 m, addressing safety and efficiency issues in coal mine roadway support. Utilizing a hydraulic motor and a four-bar linkage mechanism, the device enhances stability, reduces roof damage, and allows rapid forward movement without lowering the frame, thereby improving tunneling efficiency. Regarding the translational temporary support, [PERSON] et al.