Research on the 3D implicit potential field modeling method for urban underground space based on the open-source GemPy

doi:10.13745/j.esf.sf.2024.2.30

Abstract

Abstract:

Three-dimensional geological modeling is essential for urban subterranean space planning and management. In the era of geological big data, there is a shift towards implicit modeling techniques. While commercial software like GeoModeller and Surpac offer implicit modeling capabilities, they are proprietary and lack open-source accessibility. This paper focuses on the open-source GemPy modeling platform, utilizing three-dimensional implicit potential field modeling techniques and presenting an algorithmic solution for geological pinch-outs. The proposed approach is integrated into GemPy’s foundational modeling architecture. Through a case study of a specific urban area, the paper demonstrates the workflow for fine-scale three-dimensional geological modeling. A modeling dataset is created using borehole data and the potential field method, along with pan-Kriging interpolation, to establish a three-dimensional geological model of the urban area. Specialized techniques are employed to address urban pinch-outs. To visualize geological interfaces in the model, 18 engineering geological layers are individually displayed. The model’s accuracy is assessed using stratified K-fold cross-validation, including metrics like the Pearson correlation coefficient (CC). Experimental results show that the three-dimensional implicit potential field geological modeling method in GemPy is suitable for urban geological structures, providing a reliable foundation for decision-making in urban subterranean development.

Key words: three-dimensional geological modeling, implicit potential field method, GemPy, stratigraphic pinch-outs, urban subterranean space

CLC Number:

LIAO Zhou, LI Mei. Research on the 3D implicit potential field modeling method for urban underground space based on the open-source GemPy[J]. Earth Science Frontiers, 2024, 31(3): 482-497.

Figures/Tables 16

References 41

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地层单位				地层划分		岩性简述
系	统	阶	段	地层划分		岩性简述
第四系	全新统	上阶		SA1_0		杂填土、素填土吹填土、淤填土
		上阶		SA1_1	SA1_2	褐黄、灰黄粉质黏土、黏土	黄褐色、灰褐色粉土
		中阶		SA2		灰色淤泥质土,黄灰、灰色粉土、粉砂
		下阶		SA3_0		褐黄色黏土、粉质黏土,局部灰黄色粉细砂
		下阶		SA3		灰色淤泥质土、灰色黏性土
	上更新统	上阶	上段	SA4_1		褐黄、灰绿色黏性土,局部灰黄色粉细砂
				SA4_2		灰色黏性土,局部灰绿色粉土(第三软弱层)
				SA4_3		灰、灰黄色粉土、粉细砂
			下段	SA5_1		褐黄、灰绿色黏性土
				SA5_2		灰色黏性土
				SA5_3		灰、灰黄、灰绿色粉土、粉砂、砂,局部含砾
		下阶		SA6_1		褐黄、灰绿色黏性土
		下阶		SA6_3_4		灰、灰黄卵(砾石)、砾砂、砂
	中更新统	上阶		SA7_1		杂色黏性土层
		上阶		SA7_2		卵(砾石)、砾砂、砂
		下阶		SA8_1		杂色黏性土层,局部含砾
前第四系				SA10		不同时代不同类型岩石

地层单位				地层划分		岩性简述
系	统	阶	段	地层划分		岩性简述
第四系	全新统	上阶		SA1_0		杂填土、素填土吹填土、淤填土
		上阶		SA1_1	SA1_2	褐黄、灰黄粉质黏土、黏土	黄褐色、灰褐色粉土
		中阶		SA2		灰色淤泥质土,黄灰、灰色粉土、粉砂
		下阶		SA3_0		褐黄色黏土、粉质黏土,局部灰黄色粉细砂
		下阶		SA3		灰色淤泥质土、灰色黏性土
	上更新统	上阶	上段	SA4_1		褐黄、灰绿色黏性土,局部灰黄色粉细砂
				SA4_2		灰色黏性土,局部灰绿色粉土(第三软弱层)
				SA4_3		灰、灰黄色粉土、粉细砂
			下段	SA5_1		褐黄、灰绿色黏性土
				SA5_2		灰色黏性土
				SA5_3		灰、灰黄、灰绿色粉土、粉砂、砂,局部含砾
		下阶		SA6_1		褐黄、灰绿色黏性土
		下阶		SA6_3_4		灰、灰黄卵(砾石)、砾砂、砂
	中更新统	上阶		SA7_1		杂色黏性土层
		上阶		SA7_2		卵(砾石)、砾砂、砂
		下阶		SA8_1		杂色黏性土层,局部含砾
前第四系				SA10		不同时代不同类型岩石

地层	精度指标(值域)
地层	CC [-1,1]	RMSE (0,+∞)	bias (-∞,0)∪ [0,+∞)	MAE (0,+∞)
SA0	0.898 293	3.477 853 651	-0.568 945	0.006 677 825 4
SA1_1	0.808 163	3.868 290 178	-0.734 876	0.008 604 348 6
SA1_2	0.790 859	4.373 820 489	-10.763 290	0.009 982 961 3
SA2	0.729 982	4.918 728 856	-11.793 872	0.011 946 271 0
SA3	0.657 102	5.972 010 837	-13.802 891	0.013 985 019 8
SA3_0	0.650 391	6.108 289 082	-14.082 647	0.014 074 550 1
SA4_1	0.550 829	9.289 107 576	16.290 184	0.028 476 845 3
SA4_2	0.550 021	9.587 408 083	17.208 371	0.029 081 209 7
SA4_3	0.548 902	9.718 018 476	17.937 659	0.030 128 748 9
SA5_1	0.530 827	10.278 377 632	18.628 746	0.039 475 665 1
SA5_2	0.553 805	9.037 486 502	16.750 385	0.028 947 630 6
SA5_3	0.529 104	10.910 471 291	19.056 821	0.040 129 479 5
SA6_1	0.528 576	10.983 465 825	19.856 625	0.040 146 286 4
SA6_3_4	0.519 865	11.746 208 264	20.047 652	0.041 846 567 2
SA7_1	-0.504 872	11.896 773 621	20.103 867	0.053 857 309 1
SA7_2	-0.504 635	11.907 857 693	20.859 261	0.062 947 565 8
SA8_1	0.503 748 3	13.294 876 507	21.907 703	0.082 056 328 2
SA10	0.502 837 6	16.205 873 628	23.287 659	0.094 859 287 5

地层	精度指标(值域)
地层	CC [-1,1]	RMSE (0,+∞)	bias (-∞,0)∪ [0,+∞)	MAE (0,+∞)
SA0	0.898 293	3.477 853 651	-0.568 945	0.006 677 825 4
SA1_1	0.808 163	3.868 290 178	-0.734 876	0.008 604 348 6
SA1_2	0.790 859	4.373 820 489	-10.763 290	0.009 982 961 3
SA2	0.729 982	4.918 728 856	-11.793 872	0.011 946 271 0
SA3	0.657 102	5.972 010 837	-13.802 891	0.013 985 019 8
SA3_0	0.650 391	6.108 289 082	-14.082 647	0.014 074 550 1
SA4_1	0.550 829	9.289 107 576	16.290 184	0.028 476 845 3
SA4_2	0.550 021	9.587 408 083	17.208 371	0.029 081 209 7
SA4_3	0.548 902	9.718 018 476	17.937 659	0.030 128 748 9
SA5_1	0.530 827	10.278 377 632	18.628 746	0.039 475 665 1
SA5_2	0.553 805	9.037 486 502	16.750 385	0.028 947 630 6
SA5_3	0.529 104	10.910 471 291	19.056 821	0.040 129 479 5
SA6_1	0.528 576	10.983 465 825	19.856 625	0.040 146 286 4
SA6_3_4	0.519 865	11.746 208 264	20.047 652	0.041 846 567 2
SA7_1	-0.504 872	11.896 773 621	20.103 867	0.053 857 309 1
SA7_2	-0.504 635	11.907 857 693	20.859 261	0.062 947 565 8
SA8_1	0.503 748 3	13.294 876 507	21.907 703	0.082 056 328 2
SA10	0.502 837 6	16.205 873 628	23.287 659	0.094 859 287 5