|Table of Contents|

Experimental on road performance and cyclic dynamic stress of coarsegrained soil subgrade(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2019年02期
Page:
27-34
Research Field:
道路工程
Publishing date:

Info

Title:
Experimental on road performance and cyclic dynamic stress of coarsegrained soil subgrade
Author(s):
HE Zhongming;  YANG Yu;  DUAN Xulong
（1. Key Laboratory of Special Environment Road Engineering of Hunan Province， 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Geosciences and InfoPhysics, Central South University, Changsha 410083, Hunan, China）
Keywords:
road engineering;  coarsegrained soil;  dynamic three axle test;  road performance;  dynamic elastic modulu
PACS:
-
DOI:
-
Abstract:
To determine the road performance of coarsegrained soil subgrade under a dynamic load and wet rain, coarsegrained soil was took as the research object, and the influence of the compaction degree, dry density, and moisture content on the modulus of resilience of coarsegrained soil was analyzed. This was based on conventional physical and mechanical laboratory experiments. At the same time, the relationship between the number of axial loads and the dynamic elastic modulus under different compaction degrees and confining pressures was studied using large dynamic triaxial apparatuses. Further, a permanent deformation test of coarsegrained soil specimens was carried out under the varying compaction degrees and moisture contents. In addition, the development rule for the axial cumulative strain of coarsegrained soil under cyclic dynamic stress was discussed. The results show that the degree of compaction and the moisture content have a significant influence on the physical and mechanical properties of coarsegrained soil, and the dry density has little influence. The cumulative axial strain decreases with an increase in the compaction degree. When the compaction degree is 90%, the cumulative axial strain increases slightly during the early stage of the test. Further, when the number of loads reaches 1 000, the cumulative axial strain increases sharply. The cumulative axial strain increases with the increase in moisture content and decreases with an increase in the degree of compaction. With an increase in load times, coarsegrained soil experiences three states, stability, criticality and destruction, of which 90% of the samples showed obvious compaction. The dynamic elastic modulus of the coarse grained subgrade filler increases with the number of axial loads, and the attenuation rate decreases gradually, finally tending toward stability. 4 tabs, 14 figs, 25 refs.

References:

Memo

Memo:
-
Last Update: 2019-04-01