Road expansive soil subgrade deformation estimation method based on humidity balance
A technology of moisture balance and soil subgrade, which is applied in the survey of on-site foundation soil, roads, roads, etc., can solve problems such as deformation of road expansive soil subgrade, and achieve the effect of clear physical meaning
Inactive Publication Date: 2019-05-10
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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[0005] In view of the substantive defects and deficiencies proposed in the above-mentioned background content, the present invention provides a method for predicting deformation of road expansive soil subgrade based on humidity balance. The problem mainly needs to solve the problems of two aspects pointed out in the background technology: (1) Variation law of humidity field within service life; (2) Prediction of deformation of highway expansive soil embankment
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[0100] According to the cost-effectiveness, at present, the embankment filled with expansive soil mostly adopts the engineering treatment method of covering with non-expandable clay. The bottom of the subgrade of the K133+640~K133+810 section of a domestic highway is filled with gravel soil, and the lower embankment in the middle is filled with expansive clay and gray-black expansive soil (see Table 1 for physical properties), with one layer every 25cm , the upper embankment and the roadbed area are filled with gravel soil, and the typical cross-section of the embankment is as follows figure 1 Shown is a typical cross-sectional view of a non-expansive clay-bound embankment.
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The invention provides a road expansive soil roadbed deformation estimation method based on humidity balance. Through ingenious design, 1) a two-dimensional finite element numerical analysis model ofexpansive soil roadbed humidity change is established; 2) the change rule of the humidity field of an edge-covered expansive soil embankment within the designed service life is predicted by adopting adamp-heat coupling calculation method of unsaturated soil, not only different cross section types of the embankment and the underground water level are considered, the change rule of the humidity inthe embankment along with time and space is also considered; 3) the expansion coefficient can consider the initial water content and the initial dry density of the soil sample; and 4) the invention provides a wet expansion deformation formula which can consider the initial stress state and the final stress state of the subgrade and is more in line with the actual working state of the subgrade.
Description
technical field [0001] The invention relates to a method for predicting deformation of highway expansive soil subgrade based on humidity balance. Background technique [0002] In the construction of roads in expansive soil areas, due to the need for environmental protection and land conservation, physical treatment measures such as sealing and covering methods are often used, and medium and weak expansive soils are used as fillers to fill embankments. However, due to the high natural moisture content of expansive soil, it is difficult to compact and has poor water stability, the embankment filled with expansive soil is prone to swelling, density reduction, and bearing capacity decrease during the operation period, resulting in heaving or cracking of embankments filled with expansive soil. Early failure of pavement. Therefore, it is of great significance for the design and construction of physical treatment of expansive soil embankments to grasp the moisture change law of em...
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IPC IPC(8): E01C3/04E02D1/02
Inventor 韦秉旭冯学茂刘雄范峥白玉祥郑威陈亮胜
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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