Grouted Expansive Soil Subgrade Construction Technology Research

At present, in our country more than20provinces, city, autonomous region can be found in the presence of expansive soil, and its main distribution range is approximately in the Yunnan-Guizhou Plateau to North China plain between the river basin, basin formation plain, Kotani Kaichi as well as the INTERSTREAM block and hilly region, the most concentrated distribution area of Dongjiang River, the Pearl River Basin, laurel River, South Pan River water system, the Yangtze River catchment of the Yangtse River, Han River, Jialing River, Min River, Wujiang River, the Yellow River, Huaihe, and other areas of the Haihe River basin. Expansion and contraction, over consolidation and multiple fissures of expansive soil is the most distinct characteristics, if not modified or improved filling construction quality control is lax. will seriously affect the stability of the roadbed. Therefore, highway construction in the specific implementation of the project, expansive soil improvement technology and the improvement of expansive soils roadbed construction technology is very important.Provisional date highway project located in southern Shandong Province, the top of a hill and hill route within the depressions between relatively flat, many turned into farmland, is a focus on expansive soil area, the roadbed filling volume is big, only temporary jujube high speed five contract section of borrow earth amounts to3260000party, soil source extremely tight. The investigation showed that five contract section K64+207～K66+404available soil field for the weak expansive soil. In the construction units, supervision units in the design and support, we and the Transportation Research Institute of Shandong province for the construction of Expansive Soil Subgrade of a technology research, in full consideration of technology, safety and pro-high speed construction with special properties, such as external conditions of the premise, according to the site soil analysis, construction conditions, structural characteristics different, developed a set of model construction method--expansive soil filling core wrapping method, modified soil. The programme first in the provisional date five contract to undertake pilot construction, and in test construction launched the " expansive soil filled subgrade construction quality control " project of scientific experimental investigation of modified soil, expansive soil subgrade construction technology of side had exploration and research, test proves that the expansive soil filling subgrade construction scheme is to meet the requirements of the standards, ensure project quality, and can save the engineering investment. Through the test section construction, we on swelling soil filling roadbed construction plan are summarized, perfect, and subsequently in the provisional date Expressway expansive soil subgrade construction in full extension and application.