In order to find out the deformation law of roadway under the support of large deformation fiberglass bolt, a three-dimensional calculation model was established by using numerical simulation software, and the support effect of conventional fiberglass bolt and large deformation fiberglass bolt was compared and analyzed. The results show that when the goaf of the working face is squared for the first time and squared for the second time, the roadway shows a trend of inward contraction, and the plastic zone is mainly concentrated around the roadway. The horizontal displacement of the mining side and the settlement of the roof show a trend of gradually decreasing and then tending to be stable. When the goaf is first and second square, within the monitoring range, the maximum horizontal displacement of the mining side has reached the breaking displacement of the conventional FRP anchor rod, but it has not reached the breaking displacement of the large deformation FRP anchor rod. The conventional FRP anchor rod does not meet the support requirements, and the large deformation FRP anchor rod meets the support requirements.

In order to effectively activate the dormant assets of oil fields, the abandoned oil and gas wells are transformed into coaxial cased heat exchangers to extract geothermal energy and realise the successive development of energy, taking a shut-down oil well in Dingbian County, Shaanbei as the study example, the borehole heat exchanger module of the open-source software OpenGeoSys was used to study its heat exchange performance. Effects of different circulation flow rates, inner tube diameters of heat exchanger, power of heat exchanger, and seasonal heat extraction cycles on the performance of the transformed well are analyzed. Results show that when the heat exchange power is fixed, a flow rate of 15 m³/h can both obtain a higher outlet water temperature and ensure a long-term stable operation of the heat exchanger, using different diameters, variation of water temperature at the outlet end of the inner tube is only 0.17 ℃. For every additional 50 W of heat exchange power per meter, the outlet water temperature at the end of the heating season decreases by about 17.55 ℃, with an average decrease of 0.35 ℃/W. When the heat exchange power is constant, for every one additional month of a heating season, the annual minimum outlet temperature decreases by about 1 ℃, when the heating season is 4, 5, 6, 7, 8 months, the time required for the outlet temperature to reach a quasi-steady state during the heating season is 15, 18, 21, 24, 27 years, respectively. In order to improve the heat exchange performance of the geothermal well, it is recommended that a seasonal cycle of 5 months of heat extraction and 7 months of well shutdown in Ordos Basin Area should be used, with a circulation flow rate of 15 m³/h and a heat exchange power of 100 W.

Consolidation plugging is an effective means to control drilling fluid leakage in oil and gas wells. Revealing the migration law of plugging slurry in wellbore-fracture and constructing continuous solidified body is one of the key problems to be solved in this technology. Therefore, the CFD numerical simulation method is adopted. A numerical model of vertical fracture consolidation plugging with dynamic change of wellbore pressure is established. The effects of density, plastic viscosity, yield stress, displacement and fracture opening of Bingham flow plugging slurry on the migration of plugging slurry were analyzed. The research shows that during the grouting process, the low-density plugging slurry preferentially enters the upper part of the vertical crack. The high-density plugging slurry preferentially enters the middle of the vertical fracture, and there is obvious mixing phenomenon. The plugging slurry migrates faster in the horizontal direction than in the vertical direction in the fracture. The plugging slurry with low viscosity is easier to enter the fracture. The higher the viscosity is, the longer the time for the plugging slurry to reach the same volume ratio at the fracture outlet is. The higher the volume ratio is, the lower the efficiency of plugging slurry replacing drilling fluid is. The effect of yield stress on the migration of plugging slurry in wellbore-fracture is not significant. The smaller the displacement or the larger the crack opening, the faster the instantaneous flow rate of the plugging slurry at the crack outlet increases, the larger the volume of the plugging slurry entering the deep part of the formation, and the smaller the volume of the plugging slurry required to reach the same volume ratio at the crack outlet. The results of numerical simulation have certain theoretical guiding significance for the formulation of curing plugging scheme.

In recent years, the medical radioisotope industry has been developing rapidly, the total amount of medical radioactive articles transported in China has increased, and the regulatory authorities have paid more attention to the safe transportation work. The national regulatory requirements and the current status of the use of type A package for the transportation of Class II radioactive articles for medical use in China, the design requirements and precautions for the package, the analytical demonstration and experimental verification of the package, as well as the approval of the design and manufacturing record were introduced. Some suggestions are put forward based on the current problems, hoping that the containers for the transportation of medical radioactive articles become more standardized, unified and safe, and promote the high-quality development of the medical radioisotope industry.

In order to study the deformation of high fill in the Dalin Railway Station, a typical cross-section was selected. Four rows of settlement plates and slope observation piles were buried in the high fill, and flexible displacement meters were installed on the geogrid at the foot of the slope. After more than two years of observation, it was found that after more than half a year of construction and filling, as well as more than 12 months of standing after completion, the settlement of the high fill tended to stabilize. The maximum percentage of settlement during the filling period to the total settlement is 69.05%. The test results of the observation piles on the left and right slopes show that the high fill slope is also stable, and the maximum proportion of settlement during the filling period is 99.77% of the total settlement. After the filling is completed, the deformation of the geogrid is basically stable, indicating that the slope is also stable. It is recommended to carry out subsequent construction 12 months after the completion of filling.

Combined with the construction case of the large-span circular steel box girder structure at the visitor reception center of Cuiping Mountain Scenic Area in Yibin City, the principle of high-precision assembly technology and key technical points of large-span circular steel box girders were introduced.3D modeling was used to assist in the factory processing of circular steel box girders, the design and installation of temporary support frames, the precise control of steel box girder hoisting and positioning through BIM(building information modeling) technology in conjunction with total station instruments, and the information-based monitoring of the welding process. These key technological processes have been implemented in the project, which not only shortened the construction period and saved costs but also greatly improved the installation accuracy. This has made the overall assembly of the steel box girder structure smoother and the visual effect of the shape better.

As a kind of self-supporting supporting structure, lattice diaphragm wall is used in soft soil areas such as ports, wharfs and shipyards in the past, but it is rarely used in complex hard rock strata. Taking Laiwushan slope support project in Longhua District of Shenzhen as an example, the construction site preparation, solitary stone treatment, rock entry process, steel cage hoisting, cross steel plate joint treatment and other key processes were discussed, which provide a reference for the construction of similar projects.

Vibrations generated by subway train operations have the potential to adversely affect the normal use of precision instruments within laboratories. In order to analyze the current state of vibration response at a laboratory site proposed to be built along the subway line, a study was conducted to test environmental vibrations and train-induced vibrations at the site. An integrated seismograph was used to verify the accuracy of conventional velocity sensors at low frequencies. The results indicate that the 941B velocity sensor demonstrates good accuracy for frequency bands above 0.6 Hz, which meets the vibration measurement and evaluation standards based on VC vibration criteria. When considering the comprehensive impact of environmental vibrations within a determined period, the current site’s vibrations are at a relatively low level, essentially satisfying the vibration requirements for most general-purpose equipment and the vast majority of precision instruments. Moreover, the ambient vibrations can significantly increase under the influence of certain instantaneous external vibration sources, but these effects are mostly within the 10 Hz or higher frequency bands. When a subway train passes, there is an increase in vibrational energy near 50 Hz, which is relatively favorable for passive vibration isolation.

The terrain and geological conditions in the mountainous area of western Sichuan are complex and changeable. Dangerous rocks are mostly developed in high and steep slope sections, which pose a serious threat to the safety of highway traffic after collapse. Taking the tail perilous rock of Qiaoqi Reservoir in Baoxing County of Ya’an City as an example, the basic characteristics of perilous rock were analyzed by means of UAV aerial survey and field investigation. Rocpro3 D software was used to simulate the three-dimensional kinematics to evaluate the collapse damage. The results show that the formation of dangerous rock in the working area is caused by the combined action of tectonic compression, rainfall erosion and weathering unloading. Strong rainfall and strong earthquake are the typical causes of dangerous rock collapse. The maximum impact energy after the collapse of dangerous rock in the working area is more than 5 000 kJ, and the removal of large-size dangerous rock can effectively reduce the impact energy value. After the collapse of the dangerous rock in the working area, it shows the stage motion characteristics of rolling along the slope → bouncing after hitting the road surface near the surface of the 351 national highway → stopping the accumulation of the riverbed and bank slope of the East River. The treatment scheme of dangerous rock removal+passive protection network+open hole+frame anchor rod can be used for prevention and control.

In order to objectively evaluate the county geological disaster risk information and provide an effective research basis for disaster prevention and reduction, the risk assessment was mainly carried out in the key research area of Kuancheng Manchu Autonomous County. Based on the data of field investigation, previous research and ArcGIS spatial software analysis results, AHP(analytic hierarchy process)-information method was adopted to select 11 evaluation factors for classified evaluation of key research areas, so as to ensure the objectivity and accuracy of the research. The research results comprehensively evaluated the impact factors from the three aspects of people, land and comprehensive vulnerability, and completed the detailed analysis of the main risk factors, risk coverage and key risk areas in the county. It is found that the areas with high risk of geological disasters are mostly concentrated in the villages and towns in the north of the county, covering a wide area, and the geological conditions of the risk areas are poor and seriously affected by rainfall. The vulnerability of disaster-bearing bodies is directly related to the production, life and property safety of residents. Most of the carriers are located in towns and mountainous areas, which belong to disaster-prone areas in this risk assessment, and should be paid attention to in disaster prevention and prevention.