Abstract
Reclaimed soil is the key substrate for land reclamation and ecological restoration in the mine areas. The change of the density of reclaimed soil of the nonmetallic mines in Xinjiang during the land reclamation process was studied in this paper. Firstly, the in situ test method of static load was used to simulate the compaction of reclaimed soil with different thickness of overlying soil by different compaction times of mines reclamation machinery, and field in situ test compaction data were obtained. Then, the numerical simulation method was used to simulate the variation process of displacement and porosity at different depths for different thickness of the reclaimed soil under different compaction conditions. The numerical simulation and the in situ test results verified each other to acquire the compaction process and results of reclaimed soil under different compaction. The results showed that the numerical simulation results were consistent with the in situ test. The reclaimed soil thickness and compaction times were crucial factors affecting the compaction effect of the soil. The difference between the three times compaction and the uncompacted soil was obvious, and the effect of single compaction was weakened with the increase of compaction times. Under the same compaction action, the thicker the soil was, the less obvious the compaction effect would be. In the process of reclamation, the compaction effect of the surface part (at the depth of 10 cm) was visible, and the amount of compression and springback was larger. The research results can provide a reference to the land reclamation of nonmetallic mines in Xinjiang, China.
Highlights
Reclaimed soil is the key substrate for land reclamation and ecological restoration in the mine areas. e change of the density of reclaimed soil of the nonmetallic mines in Xinjiang during the land reclamation process was studied in this paper
In the process of this work, the reclamation machines will inevitably have a compaction effect on the surface soil, impacting on the quality of the reclaimed soil, holding back the ecological restoration of surface vegetation in the mining area. e surface soil of nonmetallic mines in Xinjiang is mostly sandy loam soil, and the soil texture is different from other places. erefore, it is of great significance to grasp the compaction change of reclaimed soil in the process of land reclamation in Xinjiang
In order to study the changes in the physical properties of the soil under different compaction effects of reclamation soil with different thicknesses, six 2 meter deep test barrels were set up (Figure 3).In these barrels, limestone waste rock was laid in the lower part (Figure 4), and 30 cm, 50 cm, and 70 cm thick reclamation soil was laid in the upper layer
Summary
E reclaimed soil sample was taken from a limestone mining area in Dabancheng district, Urumqi, Xinjiang. E reclaimed soil was calcic brown soil and belonged to sandy loam. E bulk density of the reclaimed soil was 12.646 kN/m3 with 57.71% porosity and. A total of 16 groups of 48 soil samples were obtained in the compaction experiment. E topsoil with thickness of 50 cm and 70 cm was divided into 2 layers to collect samples. E topsoil with thickness of 30 cm at the depth of 30 cm could not be sampled as it was the interface between soil and waste rocks. Samples at the depth of 10 cm were collected.
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