In highway engineering, the treatment of soft soil subgrade is a key link, which directly affects the stability and service life of the road. Especially for the shallow soft soil in the Bangtang area, due to the high soil moisture content and low bearing capacity, effective solidification technology must be adopted to improve its engineering properties. This paper will analyze a technical scheme for in-situ curing of highway soft soil subgrade, taking a highway project as an example, its technical details and implementation effects.
First of all, the scheme uses a slurry-based curing agent for foundation reinforcement treatment. The design of the hardener is critical and needs to be optimized according to the nature of the soil and the engineering requirements. In this example, the curing agent is made by mixing fly ash and cement in a certain ratio to form a slurry water-cement ratio of 1 1. The weight of each barrel of slurry is 18 tons, including 0225 tons of fly ash and 0675 tons of cement. This curing agent can effectively improve the strength and stability of the soil and meet the load-bearing requirements of highways.
Secondly, the assembly and optimization of the curing mixing system is also an important part of the program. In order to ensure that the curing agent can be evenly mixed with the soil, advanced mixing and spraying equipment and technology are adopted. The control of stirring spraying parameters is critical and needs to be adjusted according to the characteristics of the soil and the properties of the curing agent. By precisely controlling the mixing speed, spraying volume and spraying pressure, it is possible to ensure that the curing agent is well mixed with the soil to achieve the best curing results.
During the construction process, the scheme covered more than 40 ponds, with a treatment area of 53,000 cubic meters of open bang area and 43,000 cubic meters of dark bang area. The curing depth is at 15 to 22 meters, adjusted according to the soil conditions and engineering requirements of different areas. This flexible curing depth design can meet the needs of different sections and ensure the stability and uniformity of the entire subgrade.
Finally, in order to ensure the stability and reliability of the engineering quality, the curing equipment was strictly assembled and debugged. The start-up test of the curing body device is a very important part of the test, which can ensure the normal operation of the equipment and the curing effect to meet the expectations. In the construction process, it is also necessary to monitor and evaluate the curing effect, and adjust the ratio of curing agent and construction parameters in time to ensure the continuous improvement of project quality.
To sum up, the in-situ curing technology scheme of the highway soft soil subgrade successfully solves the treatment problem of shallow soft soil in the Bangtang section by improving the design of curing agent, optimizing the assembly of the curing and stirring system, and strengthening the control of stirring spraying parameters. The implementation of this scheme not only improves the bearing capacity and stability of the roadbed, but also ensures the service life and safety performance of the highway. Through precise control of the ratio of curing agent and construction parameters, as well as strict assembly and debugging of curing equipment, the stability and reliability of the project quality are ensured. The successful application of this curing technology scheme provides valuable experience and reference for similar projects, and is of great significance for promoting the progress of highway engineering technology in China. construction site