Tang Yi, Chen Chenghao, Qian Bin, Ren Jie, Guan Yunfei
Department of Geotechnical Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China.
Sensors (Basel). 2022 Mar 10;22(6):2161. doi: 10.3390/s22062161.
Clayey sand is widely distributed and commonly encountered in geotechnical engineering practice. To understand its bearing capacity behavior under unsaturated conditions, plate load tests are performed on sand-kaolin mixture samples with varying water tables. The distributions of suction and volumetric water content with depth are measured by vibrating wire piezometers and soil moisture sensors, respectively. It is shown by the test results that the bearing capacity increases when the water table in the soil sample drops. The influence of suction on the bearing capacity is found to be dependent on the height of the water table and the hydraulic loading history of the soil sample. The plate load test results are interpreted using bearing capacity equations. Good agreement is obtained between measured and calculated bearing capacities. This study provides a simple method to estimate the bearing capacity of in situ unsaturated soil foundations.
粉质砂土分布广泛，在岩土工程实践中经常遇到。为了解其在非饱和条件下的承载能力特性，对不同地下水位的砂 - 高岭土混合样品进行了平板载荷试验。分别通过振弦式孔隙水压力计和土壤湿度传感器测量吸力和体积含水量随深度的分布。试验结果表明，当土样中的地下水位下降时，承载能力会增加。发现吸力对承载能力的影响取决于地下水位高度和土样的水力加载历史。使用承载力方程对平板载荷试验结果进行解释。实测承载力与计算承载力之间取得了良好的一致性。本研究提供了一种估算原位非饱和土基础承载力的简单方法。
