In recent years, the scale of China's construction projects has continued to expand, and the construction quality of building projects has also continued to improve. However, in actual construction, especially in the construction of building foundation engineering, there are still areas that need improvement. Therefore, relevant departments should strengthen the improvement of construction techniques and technologies.
　　1. Basic Situation of Current Foundation Engineering Construction
　　1.1 The diversity of China's geographical environment and conditions determines that in the construction process, the terrain and landforms should be fully studied and tested.
　　1.2 At present, with the increase in the number of construction projects, various building collapses and safety accidents caused by foundation construction problems also occur from time to time. Therefore, in order to ensure the personal safety of residents and construction personnel, relevant departments should also strengthen strict quality control of foundations.
　　1.3 In the construction process, various construction projects and procedures must be connected and handled. Once there are quality or technical problems in the previous construction step, the continuation of the next step may lead to faults or temporary concealment, thereby forming potential safety hazards.
　　1.4 The construction characteristics of foundation engineering itself also determine that it is easy to conceal some quality problems and defects during construction. Once construction is completed, safety problems during completion or use will lead to more serious faults or safety accidents. Therefore, in the process of quality management and control of foundations, potential threats should be detected and eliminated based on experience.
　　2. Common Faults and Causes of Foundation Engineering
　　2.1 Cracks in Concrete Structures of Foundations
　　In the construction of building foundations, quality problems in concrete structures are relatively common. That is to say, strengthening crack control in concrete structures can effectively improve the quality of foundations. The main reasons for concrete structure cracks in China's construction projects are: first, inconsistent placement of sleepers in concrete structures during construction leads to uneven stress and cracks; second, inadequate curing during construction causes rapid water evaporation and cracks.
　　2.2 Water Leakage Problems in Building Foundation Engineering
　　In foundation construction, water leakage in some structures is also an important reason affecting the quality of foundations. Generally, water leakage is more likely to occur at eaves, gable walls, and deformation joints. Possible causes include human construction techniques and changes in the external natural environment.
　　2.3 Substandard Construction Materials for Building Foundation Engineering
　　In construction, especially in foundation engineering, if the selected construction materials are substandard, cannot meet the corresponding construction needs, or fail to meet relevant national quality certification standards, they will have a very adverse impact on project quality.
　　2.4 Blockage of Ventilation Ducts in Building Foundation Construction
　　Generally, in the construction of building foundation engineering, the cause of ventilation duct blockage may be unreasonable structural design in the design stage. Therefore, to solve this problem, relevant departments must strengthen supervision of the foundation design process.
　　3. Measures to Improve the Construction of Building Foundation Engineering
　　3.1 Strengthen the Selection of Foundation Construction Types for Existing Building Projects
　　As the primary construction item of a project, the foundation is the transition section connecting the building and the ground. Therefore, the construction quality of the foundation determines the construction quality of the building project to some extent. Thus, in construction management, relevant departments should pay attention to the selection of construction methods for existing foundation engineering, because different building forms and geological conditions have different requirements for the function and strength of foundations. Therefore, relevant design departments should strengthen the selection management in construction plans.
　　Generally, for soft soil foundation construction, relevant soil treatment work should be done during construction, that is, the existing soft soil should be reinforced. In other words, the properties of the existing soft soil can be neutralized through the strength of concrete.
　　3.2 Emphasize the Management of Construction Technology and Techniques for Building Foundations
　　In selecting construction methods and techniques, relevant departments should also fully consider the adaptability of existing foundations. That is, the existing soil conditions should be investigated and analyzed, and filling methods should be selected. Generally, common methods such as replacement and filling, cement-fly ash gravel piles, lime piles, dynamic compaction, vibroflotation, cement-soil mixing, high-pressure jet grouting, preloading, compacted cement-soil piles, sand-gravel piles, lime-soil compaction piles, and soil compaction piles can be used. The selection of different construction methods should be based on actual foundation conditions and fully consider the needs of building construction.
　　The building foundation treatment plan should comprehensively consider engineering geological and hydrogeological conditions, building form and functional requirements, load size and distribution, adjacent building foundations, construction conditions and material supply, and regional seismic intensity to select a reasonable foundation type. Combined with the actual foundation conditions (poor foundation, large load), the overall integrity should be enhanced and uneven settlement reduced before construction. To meet foundation and settlement requirements, pile foundations or artificially treated foundations can be used. Manual excavated piles are suitable for deep groundwater levels and no flowing muddy soil above the bearing layer. Therefore, using pile foundations as the foundation of this building is ideal. We should focus on the adverse effects of excessive length on the structure. When increasing the spacing of structural expansion joints or not setting expansion joints, practical measures must be taken to prevent structural cracking. Among various measures to appropriately increase the maximum expansion gap, taking crack prevention measures during the structural construction stage is a common and effective method to reduce the adverse effects of concrete shrinkage. The usual practice is to set post-cast strips. When the basement structure is too long and post-cast strips alone are insufficient to solve concrete shrinkage and temperature change problems, shrinkage-compensating concrete can be considered, with expansion reinforcement bands set at appropriate positions, and strict technical safeguard measures formulated to ensure the quality of concrete raw materials and the accurate mix ratio of micro-expansion agents. Structural design should take measures for the limited expansion rate of concrete in basement structural parts. In construction, whether to set permanent deformation joints between the main body of high-rise buildings and podiums, or to set post-cast settlement strips during construction, should be comprehensively determined based on the soil conditions of the bearing layer, foundation type, and superstructure layout. When using natural foundations, the embedment depth should generally be at least 2m greater than the podium foundation embedment depth. If requirements are not met, the stability of the high-rise building should be calculated and connected with the elevated floor of the high-rise building, with settlement joints set during the period. The foundation embedment depths are basically the same, and the settlement joints are filled with hard materials. If handled improperly, problems of mutual quality between high-rise building floors and underground elevated floors may occur. After the building is put into use, cracks on both sides of the settlement joint walls may be found, causing leakage.
　　In recent years, composite foundations have been widely used because of their obvious effects in improving continuous bearing capacity and controlling building settlement. However, regardless of the method used, in addition to emphasizing construction procedures, materials, and management, scientific and reasonable construction plans must first be ensured, which is the key to construction quality and safety.
　　4. Conclusion
　　In summary, quality is the foundation of a century-long plan. The quality of building construction projects is related to people's daily lives, lives, and property safety. Therefore, relevant departments should strengthen construction quality control, especially the construction quality control of building foundations, because the construction quality of foundations directly determines and affects the construction quality of the entire building project. Thus, in the construction of building foundation engineering, quality management is the key and core. Only by doing a good job in quality supervision and management of building projects can more high-quality projects be built, thereby ensuring the durability of buildings and the safety of people's lives and property.