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地基沉降计算一直是岩土工程研究中的热点和难点问题,其困难在于室内试验与原位岩土参数差异较大,尤其是砂土地基和结构性强的硬黏土地基,基于室内试验参数的沉降计算与实际的误差较大。基于原位压板载荷试验来确定计算参数的切线模量法能克服这个缺点,并能计算地基的非线性沉降,是地基沉降计算的一个新进步。但原位压板载荷试验相对其他试验难度大、费用高,尤其对于深层土体,难度更大。为此,利用位于美国Texas A&M University大学河滨校区砂土地基上进行的系统的岩土试验资料,通过其不同压板尺寸的载荷试验,对切线模量法应用于砂土地基非线性沉降计算的适用性进行了验证,然后进一步研究由旁压试验、静力触探等简单的原位试验确定切线模量法所需的计算参数的可行性。结果表明:切线模量法所需的计算参数由旁压试验、静力触探等简单的原位试验确定是可行的,从而为切线模量法的推广应用确定提供了更简单的方法。对推动地基设计理论的发展有较好的意义。
The settlement of foundation has always been a hot and difficult problem in geotechnical engineering. The difficulty lies in the difference between indoor test and in situ geotechnical parameters, especially sand foundation and structurally strong hard clay foundation. Based on the indoor test parameters Settlement calculation and the actual error is larger. The tangent modulus method based on the in-situ load plate test to determine the calculated parameters can overcome this shortcoming and calculate the nonlinear settlement of the foundation, which is a new advance in the calculation of foundation settlement. However, the in-situ load plate test is more difficult and costly than other tests, especially for deep soil. Therefore, using the geotechnical test data of the system on the sand ground of the Texas A & M University Riverside campus, the tangent modulus method is applied to the nonlinear settlement calculation of sandy soil foundation through the load tests of different platens The applicability of this method is verified. Then the feasibility of determining the required parameters of tangent modulus method by the simple in-situ tests such as pressure-side pressure test and static cone-penetration test is further studied. The results show that the calculation parameters required by the tangent modulus method are feasible by the simple in-situ tests such as pressure-side pressure test and static penetration test, which provide a simpler method for the generalization and application of the tangent modulus method. To promote the development of foundation design theory has a good meaning.