基于DFOS的排灌水條件下土體變形響應(yīng)模型試驗(yàn)研究
[Abstract]:The clay layer and the sand layer alternately change the multi-layer soil body under the strong mining groundwater action easily produces the compaction consolidation and causes the ground subsidence disaster. In order to solve the problem of land subsidence caused by aquifer water release, a land subsidence test device was developed, and the settlement and springback tests of aquifer system were carried out under the condition of drainage irrigation. The distributed optical fiber sensing technique is used to monitor the strain distribution and water content change in soil and the response characteristics of each layer to water level change are analyzed. The results show that both clay layer and sand layer have the characteristics of drainage compression and irrigation resilience, and the deformation of clay layer is more obvious than that of sand layer. There is a good corresponding relationship between the deformation of each layer and the change of water content, which shows that the deformation of sand layer and the change of water content are basically synchronized, while the deformation of clay layer lags behind the change of water content slightly. The compression curve of clay soil has obvious segmental characteristics. When the water content is below the liquid limit, the compression rate of clay layer decreases rapidly, and when the water content is higher than the liquid limit, the springback rate is obviously accelerated when the water content is higher than the liquid limit. The experimental results are of great significance for studying the mechanism of land subsidence, evaluating the potential of land subsidence and the utilization of groundwater.
【作者單位】: 南京大學(xué)地球科學(xué)與工程學(xué)院;南京大學(xué)地理與海洋科學(xué)學(xué)院;
【基金】:國家自然科學(xué)基金項(xiàng)目(41372265);國家自然科學(xué)基金重點(diǎn)項(xiàng)目(41230636)資助
【分類號(hào)】:P641.8
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