Abstract

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Title:: Roadbed construction process and quality inspection for argillaceous soft rock earth mixture spoil

Author(s):: ZHANG Sha-sha; YANG Xiao-hua; DU Yao-hui; JIA Lei; 1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Gansu Changda Highway Co. Ltd., Lanzhou 730000, Gansu, China; 3.China Jikan Research Institute of Engineering Investigation and Design Co. Ltd., Xi’an 710043, Shaanxi, China

Keywords:: road engineering; argillaceous soft rock earth mixture spoil; dynamic sounding test; quality inspection; numerical calculation

Abstract:: In order to protect the ecological environment, protect land resources and save construction fund, a reasonable roadbed construction process and effective roadbed quality inspection for argillaceous soft rock earth mixture spoil need to be provided. The engineering background was from Chengxian to Wudu superhighway project, where tests of different dynamic sounding, subgrade filling processes, the monitoring tests of roadbed subsidence and numerical calculation were carried out on the basis of soil properties and large-scale compaction test results. And the experimental data was analyzed by using linear regression method. The results show that the hammer number of dynamic sounding tests is related to the moisture content and the degree of compaction of subgrade. It will first increase and then decrease with the increase of moisture content. The moisture content has a more notable influence on the hammer number of dynamic sounding tests compared with the degree of compaction. Subgrade pavement thickness of argillaceous soft rock earth mixture spoil should be controlled at about 40 cm. The particle size of filler should not be more than 260 mm. And 8 times rolling can reach the compaction standard of highway embankment under the current construction and mechanical condition. The quality inspection methods and standards are developed for argillaceous soft rock earth mixture spoil.