Guangdong Province expressway Soft soil characteristics and treatment methods
Content Introduction Guangdong Province is located at the southern gate of the motherland, at the forefront of reform and opening up, and is a relatively developed area. It needs urgent highway transportation, especially the development of expressways. However, in high embankments, large bridges, a large number of culverts, and soft soil at passages, they are all harmed to varying degrees. For example, the sliding and cracking of subgrade, the undulation of pavement, and the bumping of artificial structures such as bridges, culverts, channels, etc?? The harm of soft soil to roads has attracted the attention of all departments of roads in China. Scientific research, design, construction and other units have gone all out to work together. After years of efforts, they have explored many countermeasures and achieved gratifying results. Guangdong is located in the forefront of the reform and opening up in the southern gate of the motherland. Since July 1989, the first Guangzhou Foshan Expressway in Guangdong Province (with a total length of 15 7km) has been opened to traffic. At present, the mileage of expressways in Guangdong Province has exceeded 2000km. By 2007, highway traffic can ensure the formation of a "half day work circle", and the mileage of expressways in Guangdong Province has exceeded 4000km. Soft soil foundation is the most common in Guangdong Province, especially in the Pearl River Delta and coastal areas. According to the data of several expressways that have been built and are under construction in Guangdong Province, the soft soil section is long, so it is not easy to deal with, and the cost increases accordingly. For example, in the completed expressway, the length is 15 7 km Guangfo Expressway, with a length of 4 43km, accounting for 29 4%; The total length of Guangzhou Shenzhen Expressway is 122km, and the length of soft soil foundation section is 34km, accounting for 28% of the total mileage of the whole line; Fokai Expressway is 80km long, including 12 98km, accounting for 16 3%. Among the expressways under construction, such as Guangzhou Ring Expressway, the east, south and west ring roads are 38km long, located in the Pearl River network area, and the length of soft soil foundation sections accounts for 80% of the whole line. The east, south and west ring roads are 38km long, located in the Pearl River network area, and the length of soft soil foundation sections accounts for 80% of the whole line. However, these sections with concentrated soft soil, thick soil layer and poor properties are passed by viaducts. Soft soil is widely distributed in the western coastal expressway and Guangzhou Zhuhai expressway. At present, three methods are generally adopted to solve the problem of soft soil foundation, including bridge erection, replacement of all soft soil or soft soil foundation treatment. Because the first two methods are expensive and not conducive to environmental protection, soft soil subgrade treatment has become a relatively economic and reliable way. However, at present, many soft soil subgrade treatment methods are affected by soft soil properties, engineering hydrogeological conditions, building types, material sources and other factors. Different regions and projects need to determine specific solutions according to local conditions.
