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

doi:10.3785/j.issn.1006-754X.2022.00.082

Chin J Eng Design

2022, Vol. 29

Issue (6): 766-775 DOI: 10.3785/j.issn.1006-754X.2022.00.082

Modeling, Simulation, Analysis and Decision

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

Qin LI¹(

),Wei PU¹,Zhi-qiang HUANG¹,Yu-xi XI²,Gang LI¹,Ruo-hao WANG¹

^1.School of Mechatronics Engineering, Southwest Petroleum University, Chengdu 610500, China
^2.Southwest Geophysical Exploration Branch, Bureau of Geophysical Prospecting Inc. , China National Petroleum Corporation, Chengdu 610000, China

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Abstract

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.

Key words： vibroseis road excitation road defect vibrating plate energy dissipation

Received: 07 March 2022 Published: 06 January 2023

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Cite this article:

Qin LI,Wei PU,Zhi-qiang HUANG,Yu-xi XI,Gang LI,Ruo-hao WANG. Analysis of road excitation effect of vibroseis in Sichuan and Chongqing area. Chin J Eng Design, 2022, 29(6): 766-775.

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https://www.zjujournals.com/gcsjxb/10.3785/j.issn.1006-754X.2022.00.082 OR https://www.zjujournals.com/gcsjxb/Y2022/V29/I6/766

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。

关键词： 可控震源, 道路激振, 道路缺陷, 振动平板, 能量耗散

Fig.1 Cement road excitation site of BV500 vibroseis

Fig.2 Evaluation system of road excitation effect of vibroseis in Sichuan and Chongqing area

Fig.3 Setting of decoupling measuring point

Fig.4 Finite element model of vibroseis road excitation

Fig.5 Finite element model of vibroseis excitation on different roads

Fig.6 Finite element model of vibroseis excitation on defective cement roads

Table 1 Size setting of cement road defects

部件	材料	密度/ (kg/m3)	弹性模量/ Pa	泊松比
振动器	45钢	7 850	$2.12 × 1011$	0.31
平板	铝合金	2 770	$7.10 × 1010$	0.33
道路	混凝土	2 600	$3.00 × 1010$	0.26
大地	硬质土	1 800	$2.00 × 108$	0.32
大地	砂岩	2 370	$1.93 × 1010$	0.38

Table 2 Material parameters of vibroseis road excitation model

Fig.7 Grid division of vibroseis road excitation model

Fig.8 Loading position and loading form of vibroseis road excitation model

Fig.9 Displacement curves of

A 5

and

A 6

points in the vertical direction

Fig.10 Comparison between simulated and calculated values of longitudinal wave velocity under different earth elastic modulus

Fig.11 Comparison between simulated and measured values of interaction force when vibroseis vibrated

Fig.12 Decoupling amount between plate and road when vibroseis vibrated on defective cement roads

Fig.13 Decoupling amount between road and earth when vibroseis vibrated on defective cement roads

道路类型	传地能量/J	地表接触中心点振幅/mm	互作用力振幅/10⁵N
碎石土路	3 604.968	2.230	$2.31$
沥青道路	2 052.352	0.963	$1.98$
无缺陷水泥道路	1 863.333	0.503	$1.89$

Table 3 Excitation intensity when vibroseis vibrated on rural roads

缺陷类型	传地能量/J	地表接触中心点振幅/mm	互作用力振幅/10⁵N
方形孔洞	1 451.596	0.433	$1.69$
圆形孔洞	839.537	0.475	$1.49$
轴向裂缝	1 591.996	0.429	$1.54$
铅垂裂缝	1 709.897	0.447	$1.71$

Table 4 Excitation intensity when vibroseis vibrated on defective cement roads

Fig.14 Distortion of interaction force when vibroseis vibrated on rural roads

Fig.15 Distortion of interaction force when vibroseis vibrated on defective cement roads

Fig.16 Classification of road excitation energy dissipation of vibroseis

Fig.17 Interaction force-normal displacement curve of each contact surface when vibroseis vibrated on non-defective cement road and gravel soil road

Table 5 Dissipated energy at different dissipation positions in one excitation period

Fig.18 10 mm thick rubber pad fixed under the vibrator plate

平板类型	传地能量/J	地表接触中心点振幅/mm	互作用力振幅/10⁵N
未加橡胶垫	1 863.333	0.503	$1.89$
施加橡胶垫	1 832.619	0.497	$1.80$

Table 6 Excitation intensity when vibroseis vibrated on non-defective cement road before and after applying rubber pad

Fig.19 Distortion of interaction force when vibroseis vibrated on non-defective cement road before and after applying rubber pad


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