Abstract
Coarse-grained materials are widely used in high-speed railway construction, and it is of great significance to research its compaction characteristics due to the high quality control requirements. In this regard, a field compaction experiment was conducted at a subgrade near Bazhou Station of Beijing-Xiong’an Intercity Railway. The test results of the compaction effect were presented in this study at first. The roller-integrated compaction measurements (i.e., compaction meter value, CMV) were compared with several traditional in-situ tests (i.e., plate load test, light falling weight deflectometer test, and shear wave velocity test). Then the stability of CMV was evaluated by the proposed δ criterion. The spatial uniformity of compaction was further investigated. Based on the analysis, the target value of CMV was preliminarily determined. It showed that Evd was more variable than CMV. The results convincingly indicated that the compaction parameters increased with the increasing number of roller passes at first. A further increase in compaction effort could result in the decompaction of material when the compaction number up to a certain value. The stability analysis method proposed in this study showed its potency of quantifying the percentage of areas with acceptable compaction. The geostatistical analysis could reflect the spatial uniformity of compaction. Overall, the conducted study could provide a useful reference for geo-material compaction control in the transportation engineering.
Highlights
Coarse-grained materials are widely used in high-speed railway construction due to its good compaction performance and high shear strength
Compactness of subgrade soils is commonly evaluated by various traditional indexes, such as degree of compaction (K), the modulus of subgrade reaction (K30 ), dynamic deformation modulus (Evd ), and deformation modulus (Ev2 )
compaction meter value (CMV) and Evd were obtained along the entire length of the test strip (Figure 5)
Summary
Coarse-grained materials are widely used in high-speed railway construction due to its good compaction performance and high shear strength. Compaction is one of the important aspects of subgrade construction [1,2], and it determines the service performance of high-speed railway [3,4]. Compactness of subgrade soils is commonly evaluated by various traditional indexes, such as degree of compaction (K), the modulus of subgrade reaction (K30 ), dynamic deformation modulus (Evd ), and deformation modulus (Ev2 ). According to previous research findings, the traditional compaction indexes exist several shortages. Using limited sample values (the sampling area is less than 1%) cannot reflect the compaction quality of the entire compaction area, which may cause test biases [5]. Failing to obtain compaction information synchronously may result in insufficient or excessive compaction [6,7]
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