Abstract：Research purposes: Soft ground is one of the most common special rock and soil in the construction of the hill road and railway construction in south China. In construction, if soft ground is treated improperly or not completely, it often leads to the failure of the upper retaining wall, anti-slide pile and other support measures, which affect project construction schedule and late operation safety, and this problem of soft foundation change between hills is becoming increasingly prominent. This paper first analyzes the types of soft foundation between hills and its damage types, discusses the causes of soft foundation change including "exploration equipment, weather" and so on, and establishes a series of principles to optimize the stratigraphic boundary of soft foundation. Research conclusions: (1) According to the organic matter content, porosity ratio, natural water content and other indexes, the soft foundation between hills can be divided into seasonal soft soil and silty soft soil. (2) The comprehensive means of "drilling + static exploration" is adopted to survey. The depth of soft foundation should be determined by drilling, while static exploration is mainly used to determine the mechanical parameters such as the bearing capacity of soft foundation. (3) A series of methods to optimize the layer boundary of soft base, such as the principle of avoiding drawing ′lens′, the principle of maximizing the soft foundation of gully heart, and the principle of the most unfavorable soft foundation of steep slope, are established. (4) It is of guiding significance to improve the survey quality of soft foundation between hills in south China and reduce the change of soft foundation in the construction stage.
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2022, Vol. 39 
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