###### Abstract
The basic principle is that certain bacteria can produce urease during their growth, and urease can catalyze the hydrolysis of urea to produce ammonia and carbon dioxide. Ammonia and carbon dioxide can be hydrolyzed into ammonium and carbonate ions in an alkaline environment, and carbonate ions combine with calcium ions in solution to form calcium carbonate precipitates. In the field of microbial improvement of geotechnical engineering performance, the use of MICP technology to improve the physical and mechanical properties of geotechnical materials is an important topic of current research by many scholars [13; 14; 15]. The performance of soil engineering treated by MICP was significantly improved. The research includes sand [16], silt [17; 18], sandy, clayey purple soil [19], yellow soil [20; 21], expansive soil [22; 23], mucky soil [24; 25], and other types of soil. The unconfined compressive strength and anti-penetration ability of soil are significantly improved, which can be used in engineering practice. [PERSON] et al. [26; 27] also studied the influence of particle size on the mechanical behavior of geotechnical materials. Using biomineralization technology and MICP technology to improve the mechanical properties of tailings sand and fix part of the heavy metals carried by it [28; 29; 30; 31; 32; 33; 34; 35; 36]. It provides a new method for the economical, effective, and green scientific treatment of heavy metal ions in tailings. Microbial protection and repair technology can effectively compensate for micro-crack repair and improve the durability of concrete structures [37; 38; 39; 40; 41; 42; 43]. By filling the concrete cracks with sand and bacterial liquid, the concrete cracks are repaired, and the compressive strength of the concrete is improved, guaranteeing the stability and life of the project. The rock and soil anti-seepage plugging technology can significantly improve its permeability. MICP technology is used to conduct rock and soil plugging experiments [44; 45; 46; 47; 48; 49; 50; 51]. It can be seen that microbial mineralization technology can form an effective plug. This method strengthens the geotechnical engineering and seepage prevention, guaranteeing its stability and durability. The particle size, particle size gradation, and relative density of soil are important factors that determine the effect of soil solidification. The academic community has carried out soil column cementation experiments for soils of various particle sizes, including kaolin, silt, fine sand, coarse sand, and gravel [52; 53; 54; 55; 56; 57; 58; 59; 60; 61; 62; 63]. The particle size range of effective cementation is obtained through the measurement of samples with different particle size gradations [59; 60; 61; 62; 63]. It is found that the sand with coarser grains and suitable gradation has a better curing effect after the improvement of MICP technology. The relationship between the relative density of the soil and the cementation strength was studied [64; 65; 66; 67; 68; 69], and it was found that the cementation strength of the soil was positively correlated with its relative density. Combined with the related research of MICP, the current research focuses on the study of microbial cemented soil, and its solidification effect is often restricted and affected by many factors; however, there is a lack of research on microbial mineralization under the influence of different factors of soil-rock mixture. Based on this, this paper takes soil-rock mixture as the research object and focuses on the mechanical performance and application prospect of soil-rock mixture improved by microbial mineralization under the influence of different factors. In this paper, the prepared bacterial liquid and cementation reagent are used to mix the bacterial liquid and cementation reagent in the soil-rock mixture under different proportions.