Impact of Reservoir Water Level Changes on Deformation of Shuibuya High Concrete-faced Rockfill Dam

doi:10.11988/ckyyb.20240812

Abstract

Abstract:

[Objective] Reservoir water levels fluctuate periodically every year during the operation period. Existing research has shown that the late-term deformation of rockfill dams is mainly caused by the prolonged water cycle loading. To thoroughly understand the impact of periodic reservoir water level fluctuations on long-term dam deformation, this study combines qualitative and quantitative analyses using nearly 17 years of deformation monitoring data from the Shuibuya concrete-faced rockfill dam (CFRD). [Methods] Qualitative analysis focused on the impact of reservoir water level changes on deformations of the dam interior and its downstream face. Quantitative analysis employed the cross-correlation method to investigate the relationship between water level variation and settlement at the section of maximum dam height. [Results] (1) Late-stage settlement deformation was mainly concentrated in the central upstream and upper downstream areas of the dam body, and the settlement and horizontal displacement increments in the upper downstream converged more slowly. (2) The late-stage deformation of dam body was primarily caused by reservoir water level fluctuations. At most measurement points at different elevations within the dam body, the settlement evolution curves exhibited fluctuations with the same frequency as the water level changes and lagged behind them. (3) The correlation coefficients between the dam body settlement increments and reservoir water levels were calculated, verifying a strong correlation between them. (4) The settlement and horizontal displacement increments on the downstream face of the dam were mainly concentrated at the top of the section of maximum dam height, and the influence of reservoir water level variation increased with elevation. [Conclusion] This study analyzes the deformation patterns of high CFRDs under reservoir water-level variations, and the findings provide valuable insights for the late-stage deformation monitoring and safety control in similar projects.

Key words: water level fluctuation, Shuibuya concrete-faced rockfill dam, long-term deformation, cross-correlation analysis method, monitoring data

CLC Number:

TV641.4堆石坝

PAN Jia-jun, HAN Bing, WANG Yan-li, ZUO Yong-zhen, WANG Jun-peng, ZHU Yue. Impact of Reservoir Water Level Changes on Deformation of Shuibuya High Concrete-faced Rockfill Dam[J]. Journal of Changjiang River Scientific Research Institute, 2025, 42(9): 114-121.

监测点	监测点坐标/m	不同阶段沉降增量/mm			总沉降量/ mm	运行阶段占总沉降百分数/%
监测点	监测点坐标/m	填筑阶段	集中蓄水阶段	稳定运行阶段	总沉降量/ mm	运行阶段占总沉降百分数/%
SV1	(-240,235)	232	354	120	706	17.0
SV13	(-200,265)	240	253	191	684	27.9
SV23	(-145,300)	1 182	337	306	1 825	16.8
SV35	(80,335)	1 706	162	317	2 185	14.5
SV36	(-40,370)	57	219	231	507	45.6
SV37	(0,370)	657	202	239	1 098	21.8
SV38	(40,370)	226	187	303	716	42.3

监测点	监测点坐标/m	不同阶段沉降增量/mm			总沉降量/ mm	运行阶段占总沉降百分数/%
监测点	监测点坐标/m	填筑阶段	集中蓄水阶段	稳定运行阶段	总沉降量/ mm	运行阶段占总沉降百分数/%
SV1	(-240,235)	232	354	120	706	17.0
SV13	(-200,265)	240	253	191	684	27.9
SV23	(-145,300)	1 182	337	306	1 825	16.8
SV35	(80,335)	1 706	162	317	2 185	14.5
SV36	(-40,370)	57	219	231	507	45.6
SV37	(0,370)	657	202	239	1 098	21.8
SV38	(40,370)	226	187	303	716	42.3

年份	SV14		SV17		SV24		SV34		SV35		SV37
年份	r	滞后时间/d	r	滞后时间/d	r	滞后时间/d	r	滞后时间/d	r	滞后时间/d	r	滞后时间/d
2010	0.814	39	0.821	63	0.880	4	0.825	39	0.897	29	0.904	5
2011	0.851	46	0.839	60	0.851	36	0.820	41	0.887	38	0.843	41
2012	0.821	36	0.849	66	0.601	31	0.759	38	0.817	37	0.790	27
2013	0.850	35	0.781	130	0.896	10	0.916	39	0.830	27	0.877	53
2014	0.846	81	0.870	63	0.881	40	0.897	33	0.843	74	0.864	39
2015	0.874	16	0.907	56	0.756	25	0.510	50	0.794	53	0.701	40
2016	0.548	32	0.690	100	0.658	16	0.494	43	0.510	60	0.725	57
2017	0.926	46	0.874	32	0.910	31	0.824	39	0.892	38	0.917	56
2018	0.724	38	0.806	45	0.750	64	0.686	47	0.815	41	0.801	63
2019	0.772	82	0.746	116	0.759	57	0.715	85	0.689	133	0.646	58
2020	0.803	56	0.876	60	0.786	75	0.892	103	0.857	96	0.846	50
2021	0.735	92	0.754	114	0.748	60	0.742	97	0.748	57	0.719	56

年份	SV14		SV17		SV24		SV34		SV35		SV37
年份	r	滞后时间/d	r	滞后时间/d	r	滞后时间/d	r	滞后时间/d	r	滞后时间/d	r	滞后时间/d
2010	0.814	39	0.821	63	0.880	4	0.825	39	0.897	29	0.904	5
2011	0.851	46	0.839	60	0.851	36	0.820	41	0.887	38	0.843	41
2012	0.821	36	0.849	66	0.601	31	0.759	38	0.817	37	0.790	27
2013	0.850	35	0.781	130	0.896	10	0.916	39	0.830	27	0.877	53
2014	0.846	81	0.870	63	0.881	40	0.897	33	0.843	74	0.864	39
2015	0.874	16	0.907	56	0.756	25	0.510	50	0.794	53	0.701	40
2016	0.548	32	0.690	100	0.658	16	0.494	43	0.510	60	0.725	57
2017	0.926	46	0.874	32	0.910	31	0.824	39	0.892	38	0.917	56
2018	0.724	38	0.806	45	0.750	64	0.686	47	0.815	41	0.801	63
2019	0.772	82	0.746	116	0.759	57	0.715	85	0.689	133	0.646	58
2020	0.803	56	0.876	60	0.786	75	0.892	103	0.857	96	0.846	50
2021	0.735	92	0.754	114	0.748	60	0.742	97	0.748	57	0.719	56

年份	SV14		SV17		SV24		SV34		SV35		SV37
年份	ρ	滞后时间/d	ρ	滞后时间/d	ρ	滞后时间/d	ρ	滞后时间/d	ρ	滞后时间/d	ρ	滞后时间/d
2010	0.824	38	0.812	41	0.817	5	0.757	20	0.807	34	0.793	7
2011	0.898	47	0.882	61	0.847	35	0.750	16	0.916	35	0.766	44
2012	0.818	36	0.813	45	0.489	34	0.559	34	0.748	34	0.686	23
2013	0.827	56	0.771	94	0.822	8	0.877	34	0.816	60	0.771	79
2014	0.853	63	0.867	65	0.796	40	0.837	25	0.828	31	0.826	36
2015	0.886	35	0.895	44	0.875	24	0.442	40	0.859	45	0.708	30
2016	0.479	40	0.582	52	0.554	13	0.299	72	0.235	52	0.697	27
2017	0.950	51	0.897	30	0.930	30	0.884	34	0.906	33	0.932	57
2018	0.833	61	0.867	53	0.865	58	0.847	75	0.826	45	0.809	68
2019	0.788	67	0.763	76	0.840	46	0.808	88	0.561	132	0.690	57
2020	0.688	24	0.892	60	0.729	7	0.715	87	0.754	48	0.755	10
2021	0.786	73	0.750	101	0.750	91	0.692	58	0.828	54	0.675	43

Impact of Reservoir Water Level Changes on Deformation of Shuibuya High Concrete-faced Rockfill Dam

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