Jin Hu

Luoshui Town in Shifang has a beautiful natural environment and a long history and culture, which is a protected area listed as a famous historical and cultural town. A large number of cultural relics and historic sites are here, such as Li Bing mausoleum, Da Peng Temple, Da Wang Temple, Houcheng Zhi, Chuanzhu Temple, Mosque, Yang Family Ancestral Hall, and Li Bing’s numerous relics of water control and immortality ascension. The vast majority of tourism introductions are about the legend of Li Bing and the comparison between the Luoshui irrigation project and the Dujiangyan irrigation project, but little research has been done from the perspective of engineering design. To explore the tourism culture of Luoshui town from the perspective of engineering design, the Daoluo water conservancy project in Shifang was studied through a literature search, field investigation, and semi-aerial geophysical prospecting. By comparing its design concept and design form with the Dujiangyan irrigation project, the design characteristics of the Luoshui water conservancy project in Shifang, Deyang were excavated. At the same time, combined with the cultural relics around the water conservancy project, it was judged that the water conservancy project was likely to be built by Li Bing, and Li Bing was also likely to die in Shifang to a large extent.

The survey area is located in the planning area of Longquan national urban park, with frequent human activities, numerous water conservancy, transportation projects, and frequent geological disasters such as landslides. The Red Mudstone has low strength and easy to soften in the case of water, and it is very prone to landslide in rainy season. At present, there are many studies on Red Mudstone Landslides, but most of them are analyzed by geological means, and the monitoring process is also dominated by surface deformation and settlement; there is less analysis with hydrogeological that is caused by rainfall and human activities. For Red Mudstone Landslides, to effectively reveal and analyze the process of the Slip Mechanism, we need to carry out the characteristics of hydrogeological structure and underground physical structure, and compare with surface monitoring and point geological structure. In this study, a one-year field survey and hydrogeophysical survey were carried out. Combined with the characteristics of environmental geology, the geophysical forward modeling problem based on finite element method was used to verify the influence of rainfall on the electrical characteristics of underground media. The smoothness constrained least square method and three-dimensional unstructured grid method are used to interpret the ERT data, analyze the abnormal patterns of electrical structure of landslide in different seasons, and correspond well with the GPR data. According to the characteristics of surface vegetation and weathering, as well as the displacement and settlement monitoring after landslide, the spatial characteristics of red bed landslide are revealed, and the relationship between landslide, rainfall, and human activities is clarified.

The production processes for the gypsum‐ and cement‐based materials, which are widely used in civil engineering projects, require the consumption of large amounts of energy and natural resources. At the present time, the main development directions of civil engineering material include realizing solid waste recycling and the applications of green building materials, which can be then used in the fields of disaster treatment and ecological restoration, such as grouting materials. In addition, the grouting quality is always difficult to detect. This study examined the gypsum‐ and cement‐based green grouting materials made from mineral solid waste used in disaster and cloud detection by means of electromagnetic characteristics. According to the requirements of electrical testing of grouting quality, first we designed a material made with solid waste. Then, we studied the resistivity, strength, porosity, and other physical and mechanical properties of the material. The test results of the material and its soaking solution indicate that this material is a green material meeting the environmental safety standards. The experimental results show that the rapid detection of grouting quality can be realized. The following effects on electromagnetic characteristics and mechanical properties of the green materials of gypsum‐ and cement‐based were analyzed. The results showed that the resistivity and strength were related to the ratios of the water content to the modified phosphogypsum; the percentages of cement content in the total amount of modified phosphogypsum and marble powder; the percentages of marble powder in the modified phosphogypsum; the percentages of steel fiber content in the phosphogypsum; and the fineness of the marble powder. The field test results also confirm that the green grouting material can be effectively applied in engineering repair imaging monitoring.