1D non-linear consolidation under haversine repeated loading(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年05期
- Page:
- 31-38
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- 1D non-linear consolidation under haversine repeated loading
- Author(s):
- CHENG Da-wei; CHEN Xi
- 1. School of Environmental Science and Engineering, Chang’an University, Xi’an 710054, Shaanxi, China; 2. Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, Chang’an University, Xi’an 710054, Shaanxi, China; 3. School of Civil Engineering and Architecture, Shaanxi University of Technology, Hanzhong 723000, Shaanxi, China
- Keywords:
- road engineering; subgrade; non-linear consolidation; haversine repeated loading; analytical solution; initial condition
- PACS:
- U416.01
- DOI:
- -
- Abstract:
- For the problems of consolidation settlement of subgrade soil caused by traffic loads, which were considered as haversine repeated loading, on expressways, airports, railways and other traffic facilities, the paper analyzed soil consolidation process and the influence of loading rest periods, loading frequency and soil initial excess pore water pressure. By modifying the Davis’s hypotheses, the 1D nonlinear consolidation governing equation could be applied to saturated soil consolidation process under the condition of non-zero initial excess pore water pressure. The general solutions of the governing equation were derived via the separation variable method under haversine repeated loading. The analytical solutions with three typical initial conditions, including initial excess pore water pressure as constant, regular triangular distribution and inverted triangular distribution were reported. Consolidation process of homogeneous saturated soil was simulated for different conditions, such as rest periods of loading, frequencies of loading and initial excess water pressure. The results show that the peak value of excess pore-water pressure decreases with time, but effective stress and average consolidation increase with time. The effects of the initial conditions on the consolidation process happens mainly during the early stages of consolidation. Under zero initial excess pore-water pressure condition, peaks of effective stress and average consolidation degree are the highest. Other cases from large to small in order are inverse triangular distribution condition, triangular distribution condition, and rectangle distribution condition. The differences of rest periods or loading frequencies have an impact on all stages of the consolidation process. With the increase of the rest period, the peak of the average consolidation degree decreases when reaching the static state and the consolidation process is delayed. With the decrease of loading frequency, the average consolidation peak increases, and the consolidation process is accelerated.
Last Update: 2017-10-16