切线模量法确定强夯地基承载力的现场试验研究

A Field Study by Tangent Modulus Method on Bearing Capacity of Consolidated Foundation

平板载荷试验是检验强夯加固填土地基承载力的重要手段,基于平板载荷试验的切线模量法以安全系数和允许沉降两个控制因素结合Terzaghi极限承载力理论可计算不同沉降要求的地基承载力。为了验证切线模量法计算强夯地基承载力的可行性和优越性,对现场填土地基进行强夯加固后进行平板载荷试验和超重型动力触探试验,以三组平板载荷试验9个试验点的测试结果为基础,反演该地基土性参数并通过切线模量法绘制p-s曲线,发现切线模量法计算的p-s曲线与现场p-s曲线能够很好的吻合,故可用切线模量法计算基础中心不同沉降量所对应的地基承载力,且能够弥补平板载荷试验和动力触探测试方法的不足,故为浅基础的设计提供了一条新的途径。

Plate load test is an important means to test the bearing capacity of consolidated foundation, the tangent modulus method, based on the plate load test, can calculate the requirements of different settlement with two control factors by safety coefficient and allowed settlement combining the theory of Terzaghi ultimate bearing capacity of foundation bearing capacity. In order to verify the tangent modulus method to calculate the feasibility of the foundation bearing capacity by dynamic compaction, three groups of plate loading test of nine sites have been done. On the basis of the test results , the foundation parameters are obtained and p-s curve is drawn by the tangent modulus method. It is found that the p-s curve calculated through the tangent modulus method matches well with the p-s curve on the site, there- fore, it is available for tangent modulus method to calculate the foundation bearing capacity for different settlement at foundation center, which will provides a new way for shallow foundation design.