Dynamic stability of carbonaceous mudstone embankment under rainfall infiltration(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年01期
- Page:
- 33-42
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Dynamic stability of carbonaceous mudstone embankment under rainfall infiltration
- Author(s):
- FU Hong-yuan; QIU Xiang; LI Guang-yu; ZENG Ling; LIU Xin-xi
- 1. Key Laboratory of Road Structure and Material of Ministry of Transport, Changsha University of Science & Technology, Changsha 410114, Hunan, China; 2. School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China; 3. School of Civil Engineering and Architecture, Changsha University of Science & Technology, Changsha 410114, Hunan, China
- Keywords:
- road engineering; carbonaceous mudstone embankment; rainfall infiltration; seepage force; softening effect; unsaturated effect; stability analysis
- PACS:
- U416.12
- DOI:
- -
- Abstract:
- In order to study the carbonaceous mudstone embankment stability under the condition of rainfall infiltration, this paper analyzed the factors influencing the stability of embankment, and proposed a stability analyzing method that can consider the saturation, pore water pressure, seepage force, soften and unsaturation effect. Combing the saturatedunsaturated seepage and stability theory, this paper used the proposed method to calculate the changes of embankment seepage field and stability in rainfall condition. The results show that the dynamic stability calculation method presented in this paper has strong practicality, which can consider the stability of carbonaceous mudstone embankment influenced by multiple factors. During the period of rainfall, the underground water level inside the carbonaceous mudstone embankment rises gradually, the resultant force of penetration decreases first and increases later. After rain, the underground water level inside the embankment reduces rapidly, the resultant force of penetration decreases gradually. Under the condition of rainfall, the seepage velocity of soil in unsaturated zone near the carbonaceous mudstone embankment slope is directly proportional to the change of its pore water pressure and saturation, the seepage velocity and penetration force of soil in saturated zone along the inside of embankment horizontally outward is directly proportional to the change of the underground water level under embankment slope surface, the seepage velocity and penetration force of soil in saturated zone along the upper part of embankment vertically downward is inversely proportional to the change of the underground water level under embankment slope surface. In the process of rainfall, the stability safety factor of the carbonaceous mudstone embankment decreases first, then increases and continues to reduce again. After the rain, the stability safety factor first recovers quickly, then levels off. During the early period of rainfall, the plastic tape of saturated zone expands first and then dissipates, and the plastic tape over the slope foot keeps unchanging. During the later period of rainfall, the plastic tape of saturated zone and the plastic tape over the slope foot continue to expand. After the rain, the plastic tape of saturated zone and the plastic tape over the slope foot gradually dissipate.
Last Update: 2017-01-21