埋地管线-土轴向动力相互作用等效弹簧系数取值

Soil spring constant of buried pipeline-soil longitudinal dynamic interaction

摘要:

通过解析法和振动台试验数据对埋地管线-土轴向动力相互作用等效弹簧系数取值进行了研究。从一维柱面SH波波动方程出发，重新阐释了 Matsubara和Hoshiya推导的管土轴向动力相互作用等效弹簧系数解析表达式，并对主要影响参数进行了分析；利用埋地管线振动台试验结果对小震时（0.1g）管土轴向动力相互作用进行了分析，给出了等效弹簧系数，并与解析解进行了对比。分析结果表明，对于本试验条件，采用解析法计算的等效弹簧系数和试验分析结果较为接近，相对偏差约为7.4%，在一定程度上验证了解析方法的合理性，并根据工程需要，给出了管土未发生大滑移时的等效弹簧系数取值范围：0.6G-2.0G（G为土体剪切模量）。

Abstract:

Soil spring constant of buried pipeline-soil longitudinal dynamic interaction based on theory and shaking table test is presented. According to one-dimensional SH wave motion theory in cylindrical coordinates ,Matsubara&Hoshiya’s theoretical expression is reinterpreted. Based on shaking table test data of buried pipeline –soil dynamic interaction subjected to small earthquake excitation(0.1g), the soil spring constant is analyzed. The results show that on this test condition the two values of soil spring constant are similar ,and the relative deviation is about 7.4% , that verifies the rationality of theoretical solution . Furthermore, soil spring constant at small slippage between pipeline and soil is recommended for engineering application, that is 0.6G-2.0G(G=soil shear modulus).