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Water pipelines are important lifeline engineering. In order to study the seismic dynamic response law of up-down large diameter water pipelines crossing at short distance. A series of shaking table tests with a model similarity ratio of 1∶10 were conducted to study the seismic response law of large diameter water transmission pipelines in close proximity. The acceleration response and strain response of the structure and soil layer under single pipeline structure and cross pipeline conditions were compared and analyzed. The analysis results show that underpass pipelines have a complex impact on the acceleration response of the upper pipeline, depending on the size of the load, site dynamic characteristics, etc; When the input peak values of El-Centro are 0.1 g and 0.2 g, the downward crossing of the pipeline reduces the acceleration of the upper pipeline by 28.0% and 7.9%, respectively relative to a single pipeline. However, when these valuses of El-Centro are 0.4 g and 0.6 g, the peak acceleration of the upper pipeline increases by 4.9% and 39.5% relative to the acceleration of a single pipeline. The underpassing pipeline reduces the peak value and increases the bandwidth of the Fourier spectrum of acceleration when passing through the pipeline. The maximum strain peak of the pipeline occurs at a 45° between the lower part of the pipeline and the horizontal plane, which is 3.6% to 39.0% lower than the peak strain of a single pipeline.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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