No abstract

Through mechanical analysis, combined with the instability mode and failure mechanism of dangerous rock mass, taking into the consideration of the influence of blasting excavation of the dangerous rock mass on the dynamic characteristics of it based on the limiting equilibrium method, the stability equations of dangerous rock mass at adjacent side slope with blasting and excavation under explosion load are derived. The engineering practice shows that the slope blasting has obvious influence on the stability of the adjacent dangerous rock mass, and the distance R between the blasting point and the dangerous rock mass and the explosive quantity Q are the key factors affecting the stability coefficient of the dangerous rock. The stability of the dangerous rock mass increases with the increase of the distance R, and decreases with the increase of the explosive amount Q. It is suggested that the impact of the blasting vibration force on the adjacent dangerous rock mass should be considered when the slope blasting is excavated.

BIM (Building Information Modeling) is to create models based on various related information in construction projects and use simulation virtual technology to model actual building information. It is not only the integration of digital information but also the application of digital information in engineering construction. Digital models can be used to plan and simulate the whole process of construction projects scientifically and accurately. In the process of project construction, wireless network communication technology can provide a good basis for collaboration, which is essential for the control of project progress, task scheduling, and systematic communication between all parties. This article introduces the LTE wireless network communication technology and network coverage plan, summarizes the cost and schedule control principles of construction projects, analyzes the factors that affect the construction schedule in subway construction, and introduces the application of BIM technology in subway construction schedule control. Taking the construction of Section XX of Line 1 of City A as an example, a simulation experiment was carried out, and the optimization effect was evaluated with SPI and CPI indicators. The final experimental results show that it is meaningful to use the BIM model algorithm to optimize the subway project. In the simulation experiment, the corresponding construction period saving rate after completion of the project is 6.94%.

This paper aims to develop suitable formulas of the drilling fluid for slow angle wireline core drilling. Firstly, the materials and properties of drilling fluid were analyzed in details. Then, three kinds of drilling fluids were prepared, namely, those with low-solid phase mud, those with no-solid phase mud, and those with weighted mud. After that, a total of forty drilling tests were carried out using each type of drilling fluids. The average coring rate was as high as 87%. Based on the test results, the drilling fluid formulas for slow angle wireline core drilling were optimized as follows: original mud + 4.5% cellulose + 5% potassium humate + 4.5% high-efficiency water loss reducer + 6% multi-effect plant gum SD-2 + 5% type 06 lubricant + water for relatively complete strata; original mud + 0.75% cellulose + 2% potassium humate + 2% multi-effect plant gum SD-2 + 5% type 06 lubricant + water for broken and collapse-prone strata; original mud + 0.75% cellulose + 5% potassium humate + 2% multi-effect plant gum SD-2 + 5% type 06 lubricant + 10% barite + water for high-pressure strata. The research results provide a good reference for drilling fluid preparation in slow angle wireline core drilling.

The three-dimensional stratum space interpolation algorithm plays a vital role in promoting the safety, management, and decision-making of subway tunnels and is a current research hotspot. The purpose of full text is to study the 3D stratum space interpolation algorithm of subway tunnels and to study the 3D stratum space interpolation algorithm based on building information modeling (BIM) and data fusion technology. This article first uses computer three-dimensional visualization technology to simulate the surface of the ground-fall tunnel based on known data. It is to do the interpolation processing on the two-dimensional space of the subway tunnel to create an accurate surface model of the subway tunnel. It then uses the block model method to divide the internal data of the tunnel according to actual needs. In order to create a model of the internal data of the tunnel, three-dimensional spatial interpolation is performed. After the three-dimensional interpolation is completed, it is convenient to quickly estimate the taste and reserves according to the interpolation results. The experiments in the text show that the average error value of the algorithm in this paper is 38.98 and the performance is improved by 23.4%. The algorithm in the text has obvious advantages in interpolation effect, and the interpolation efficiency is faster. A bird’s eye view of the current study is shown in Figure 1.