确定地基承载力的载荷试验尺寸效应问题的研究

摘要

在工程中确定地基承载力时进行载荷试验，不同尺寸的载荷试验其应力扩散范围不一样，对载荷试验中的沉降也产生的影响较大。本次载荷试验是在室内以基坑内进行，其地基土都是层层筛出，均匀夯实填回坑中，保证土层的均匀性。载荷板尺寸分别采用1200mm×1200mm、700mm×700mm、500mm×500mm三种尺寸载荷板，通过试验中得到的P-S曲线确定不同载荷板尺寸下地基承载力的大小。随着载荷板尺寸增大，其载荷试验的沉降较大，地基承载力较小；载荷板尺寸变小，其载荷试验的沉降较小，地基承载力也较大。%In the engineering when the load test is done to determine the bearing capacity of foundation soil, different size of the load test has different stress diffusion range, which has great influence on the settlement of the load test. The load test is carried out within the interior in foundation pit ,the foundation soil is screening layer upon layer with uniform compaction to ensure uniformity of the soil.The size of load test has 1200 mmí1200 mm、700 mmí700 mm and 500 mmí500 mm, the bearing capacity of foundation soil is confirmed by P-S curve under different load test size. The settlement of the load test is larger with the size of loading plate increasing, the foundation bearing capacity is smaller;and the settlement of the load test is smaller with the loading plate narrowing, the foundation bearing capacity is also bigger.