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水平液化场地地表往返位移的求解是基础和地下工程抗震设计的迫切需求。利用双层模型模拟实际水平场地,提出了可考虑液化层存在下的土表位移简化计算方法并给出频域理论解答,同时采用逐循环累计方法给出水平场地任意荷载下土表位移时域解答。采用适于水平场地孔压增量模型,并逐循环修正土层模量,模拟液化引起的土层的非线性过程。振动台试验结果和提出棋型的计算结果吻合,验证了所提方法能够反映土体液化对土表位移影响的基本过程。提出的方法和解答物理意义明确,可代表土体液化对土表位移影响的基本形态,并可用于频域及时域的无量纲分析。
The solution to the displacement of the surface of the horizontal liquefaction site is an urgent demand for the seismic design of foundation and underground engineering. A two-layer model is used to simulate the actual horizontal ground. A simplified calculation method of soil surface displacement in the presence of liquefied layer is proposed, and a theoretical solution of the frequency domain is proposed. At the same time, by cyclic cumulative method, answer. The pore pressure increment model suitable for horizontal field is adopted, and the soil layer modulus is modified cyclically to simulate the nonlinear process of soil layer caused by liquefaction. The results of shaker test are in good agreement with the calculation results of the proposed chess model, which verifies that the proposed method can reflect the basic process of soil liquefaction on the displacement of soil surface. The proposed method and solution have definite physical meanings and can represent the basic form of the influence of soil liquefaction on the displacement of soil surface and can be used for dimensionless analysis in frequency and time domains.