川渝地区可控震源道路激振效果分析

川渝地区地形地貌复杂，可控震源在其乡村道路激振时存在激发信号畸变较大及激发能量耗散较大等问题。为了解决该问题，建立了可控震源道路激振模型，构建了可控震源道路激振效果评价体系，开展了川渝地区可控震源乡村道路激振效果研究，分析了可控震源道路激振能量耗散。结果表明：构建的激振效果评价体系能够较为全面地对川渝地区可控震源道路激振效果进行评价；相比碎石土路，可控震源在无缺陷水泥道路激振时传地能量减弱48.31%，地表接触中心点振幅下降77.44%，互作用力振幅下降18.18%，信号畸变增大34.69%，激振效果较差；道路缺陷对激振效果具有明显的减弱影响，圆形孔洞道路缺陷对激振效果的影响尤为突出，其中传地能量减弱54.94%，地表接触中心点振幅下降5.57%，互作用力振幅下降21.16%，信号畸变增大36.17%；川渝地区可控震源道路激振时，平板的结构能量耗散较大，约占系统总耗散能量的90%。研究结果可以为川渝地区可控震源乡村道路激振效果的改善提供理论指导。

Analysis of road excitation effect of vibroseis in Sichuan and Chongqing area

Due to the complex terrain and landform in Sichuan and Chongqing area, there are some problems such as larger distortion of excitation signal and larger dissipation of excitation energy when vibroseis vibrates on rural roads. In order to solve this problem, a road excitation model of vibroseis was established, an evaluation system of road excitation effect of vibroseis was established, a study on the road excitation effect of vibroseis in Sichuan and Chongqing area was carried out, and the energy dissipation of road excitation of vibroseis was analyzed. The results showed that the proposed evaluation system could comprehensively evaluate the road excitation effect of vibroseis in Sichuan and Chongqing area; compared with gravel soil road, the ground transmission energy was 48.31% lower, the amplitude of surface contact center point was 77.44% lower, the amplitude of interaction force was 77.44% lower, the signal distortion was 34.69% higher, when vibroseis vibrated on non-defective cement road and the excitation effect was poor; the road defects had obvious weakening effect on the excitation effect, especially the round hole road defects, in which the ground transmission energy decreased by 54.94%, the amplitude of the surface contact center point decreased by 5.57%, the amplitude of the interaction force decreased by 21.16%, and the signal distortion increased by 36.17%; when vibroseis vibrated on roads in Sichuan and Chongqing area, the structural energy dissipation of the flat plate was relatively large, accounting for about 90% of the total energy dissipation of the system. The research results can provide theoretical guidance for the improvement of rural road excitation effect of vibroseis in Sichuan and Chongqing area.