Moisture characteristics test of carbonaceous mudstonesoil stratified filling embankment under the rainfall condition(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2016年05期
- Page:
- 29-36
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Moisture characteristics test of carbonaceous mudstonesoil stratified filling embankment under the rainfall condition
- Author(s):
- ZENG Ling; QIU Xiang; FU Hong-yuan; ZHOU Gong-ke; CHEN Xiang-yang
- 1. Key Laboratory of Road Structure and Material of Ministry of Transport, Changsha University of Science & Technology; 2. School of Civil Engineering and Architecture, Changsha University of Science & Technology; 3. School of Traffic and Transportation Engineering, Changsha University of Science & Technology; 4. Co-Innovation Center for Advanced Construction and Maintenance Technology of Modem Transportation Infrastructural Facility
- Keywords:
- road engineering; carbonaceous mudstone; rainfall condition; model test; moisture characteristic
- PACS:
- U411
- DOI:
- -
- Abstract:
- To study the moisture characteristics of carbonaceous mudstone-soil stratified filling embankment in the rainfall condition, combined laboratory model test with numerical simulation, the embankment model test under the condition of artificial rainfall was carried out, the variation of water content evolution of transient saturation zone in the embankment during the rainwater infiltration were analysed, and the test results were verified by numerical experiment. The results show that short term rainfall has little impact on water content of surface soil of embankment. The impact increases as the rain continues, and with the influence of filling forms, moisture content curve of every cross section presents “S” shape or inverted “S” shape. The increased magnitude and the rate of soil moisture content under the same depth of embankment slope is inversely proportional to elevation, the increased magnitude and the rate of soil moisture content under the same depth of the embankment internal is inversely proportional to the distance to the surface of slope. Transient saturated zone caused by rainfall extends from surface to internal of embankment, the extending speed at top of the embankment is smaller than that at the bottom. At the same time, the extending speed at the pre-disintegrating carbonaceous mudstone is faster than that at the soil. When the transient saturation zone extends to a certain depth, it may cause the rising of groundwater. The limitations of visual observation and moisture migration of filling process and the size effect of model experiment load to some differences between the results of model experiment and the consequence of numerical experiment. Through the exploration of the variation of moisture content of embankment characteristic and the cross section, and the distribution form of transient saturation zone, the test results have reference significance for the study of the subsequent disintegration mechanism and the design of slope drainage and the unstable model of carbonaceous mudstone-soil stratified filling embankment under the condition of rainfall.
Last Update: 2016-10-06