|Table of Contents|

Effect of replacing-filling and dewatering-draining measures on frozen characteristics of weak subgrade in cold valley region(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2018年04期
Page:
22-33
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Effect of replacing-filling and dewatering-draining measures on frozen characteristics of weak subgrade in cold valley region
Author(s):
WU Li-bo123 NIU Fu-jun1 LIN Zhan-ju1 QI Wei4 FENG Wen-jie1
1. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China; 2. School of Civil Engineering and Hydraulic Engineering, Ningxia University, Yinchuan 750021, Ningxia, China; 3. School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China; 4. Gansu Highway and Bridge Construction Group Co., Ltd., Lanzhou 730030, Gansu, China
Keywords:
subgrade engineering mountain valley weak subgrade frozen characteristic frost heave deformation field test muck gravel soil replacing-filling dewatering-draining measure
PACS:
U416.168
DOI:
-
Abstract:
Based on the Tanchang-Diebu Secondary Highway in South Gansu, two typical soft soil subgrade test sections in the cold valley region were selected, the subgrade's temperature, moisture content, deformation and the groundwater level were monitored, and the influences of the muck gravel soil's replacing-filling depth and dewatering-draining measure on the frozen characteristics of the subgrade were analyzed. Analysis result indicates that in the two monitored frozen periods, the maximum frozen depths at the test section K18+180 with 2.0 m-replacing-filling thickness is 0.12-0.16 m deeper than those at the test section K18+330 with 1.0 m-replacing-filling thickness, so the bigger the replacing-filling thickness is, the bigger the frozen depth is. For the test section K18+330, the initial groundwater level is 3.4 m. When the surface drains were only adopted, the groundwater level in the frozen periods is about 3.4 m, and the smallest distance to the frozen surface is 1.7 m, which shows that the surface drains scarcely affect the groundwater level in the frozen periods. For the test section K18+180, the initial groundwater level is 1.3 m. When the seepage ditches are adopted, the groundwater level in the frozen periods is about 2.0 m and reduces by 0.7 m, and the smallest distance to the frozen surface is 0.2 m, therefore, the seepage ditches can reduce the groundwater level and prevent the frost heave of the subgrade. The maximum frost heaves of the center of the test section K18+330 are 3.4 and 4.2 mm in the frozen periods, respectively, and the values of the test section K18+180 at the relevant position are 10.7 and 14.0 mm that are more than three times as much as the formers, respectively, therefore, the bigger the replacing-filling thickness is, the smaller the frost heave of the subgrade is. The maximum frost heaves of the test sections K18+180 and K18+330 are 4.2 and 1.4 mm, respectively, the maximumsettlements are 1.5 and 1.8 mm, respectively, and they are much less than the admissible frost heave of 50 mm and the admissible settlement of weak subgrade of 500 mm for the secondary road in the Specifications for Design of Highway Subgrades(JTG D30—2015), therefore, the stability of the subgrade at the test section is good, and the replacing-filling and dewatering-draining measures can effectively control the frost heave of the subgrade. 4 tabs, 14 figs, 32 refs.

References:


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Last Update: 2018-08-30