Experimental on settlement of subgrade filled by improved argillaceous soft rock(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2018年03期
- Page:
- 18-25
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Experimental on settlement of subgrade filled by improved argillaceous soft rock
- Author(s):
- DU Yaohui; YANG Xiaohua; WANG Mingjiao
- Keywords:
- -
- PACS:
- -
- DOI:
- -
- Abstract:
- To study the application of argillaceous soft rock discard in subgrade filling, considering the Chengwu (Chengxian to Wudu) Expressway as the engineering background, the settlement law of argillaceous soft rock and three kinds of modified fillers were analyzed using a centrifugal modeling test. Furthermore, the settlement, the settlement rate, and the twoyear consolidation time of four kinds of waste slag fillers were investigated. The settlement monitoring of the subgrade was presented in the test section of the project, and the settlement law of the subgrade of the mud soft rock slag after improvements by gravel, was studied. The results show that the settlement of subgrade filled by argillaceous soft rock is the largest. Moreover, the settlement of the top surface of the embankment center line is 53.58 mm, the edge of the subgrade is 49.25 mm, whereas embankment filling with gravel treatment has a minimum settlement, the settlement of the top surface of the embankment center line is 35 mm, which decreased by 34.7%, and the settlement of the edge of the subgrade is 33 mm, which decreased by 33%. The subgrade filled by argillaceous soft rock has a maximum settlement rate, up to 0.5 mm/d, however, the settlement rate of the filling with gravel treatment is minimum, with 0.2 mm/d. The order of the sequence of decreasing consolidation times is argillaceous soft rock, reinforced with geocell, cement treatment, and gravel treatment. The settlement of roadbed filled with argillaceous soft rock presents the characteristics of a larger center at the top of the foundation and a smaller settlement on both sides, the settlement rate of the top of the subgrade before 30 d is the maximum, and the maximum settlement after 144 d reaches 27.1 mm. Due to the difference between the retaining wall and subgrade slope, the settlement near the end of the slope is larger than that near the retaining wall. The settlement law of the observation points is similar, which is also in good agreement with the test results. The research results can provide a reference for similar projects. 2 tabs, 13 figs, 27 refs.
Last Update: 2018-06-12