Research of tidal water level amplitude and phase and application to causation analysis of well water level changes
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摘要: 将多孔介质中井-含水层-隔水层的潮汐水位振幅和位相的计算公式推广到裂隙饱水岩体潮汐分析中， 分析了裂隙含水层中井与裂隙， 裂隙与微裂隙的潮汐孔压响应原理和水流交换过程， 提取了影响裂隙含水层潮汐水位振幅和位相的主要因素， 应用井-裂隙排水产生的井水位-引潮高的振幅比A和位相差α2主要随径向等效导水系数T同向变化, 裂隙和微裂隙(孔隙)排水产生的孔压-引潮高的振幅比D和位相差α1主要随不排水条件下微裂隙与裂隙间振幅比E'/E反向变化的规律， 提出了潮汐井水位振幅和位相的8种不同变化类型， 分析了不同类型所反映的含水层形变， 并用于分析东川、 弥勒和西昌川03等3口井井水位振幅和位相变化的成因.Abstract: The theory of the amplitude and phase shift of tidal well water-level variation in well-aquifer-aquiclude system (WAAS) is introduced to study hydraulic flow among the well, fractures and micro-fractures (porosity) in the well-fracture-micro-crack fracture (porosity) system (WFMS). While analyzing the tide induced pore pressure and the hydraulic flow process in WFMS, the main factors affecting amplitude and phase shift in WFMS were drawn up. The amplitude ratio A and phase α2 of the tide water-lever caused by hydraulic flow between the well and fractures vary with the same tendency as equivalent transmissivity (T). The amplitude ratio D and phase α1 of tidal water-lever caused by hydraulic flow between fracture and micro-crack (porosity) vary in opposite trend with the tidal amplitude ratio (E'/E) between fracture and micro-crack under undrained condition. An analysis table on aquifer deformation is listed in this paper according to the changes of well water level, tidal amplitude and phase ratio. And is used to analyze abnormal causes of water level changes in Dongchuan, Mile and Xichangchuan 03 three wells.
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Keywords:
- tide /
- phase /
- amplitude /
- fracture /
- aquifer-zone
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图 1 东川井静水位(a)、 M2波潮汐水位振幅和位相(b)变化曲线
Figure 1. Change of static water-level (a),amplitude and phase shift for M2 tide (b) in Dongchuan well
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图 2 弥勒井动水位(a)、 M2波潮汐水位振幅和位相(b)变化曲线
Figure 2. Change of water-level (a),amplitude and phase shift for M2 tide (b) in Mile well
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图 3 西昌川03井静水位(a)、 M2波潮汐水位振幅和位相(b)变化曲线
Figure 3. Change of static water-level (a),amplitude and phase shift for M2 tide (b) in Xichangchuan 03 well
表 1 潮汐井水位振幅和位相的变化形态、因及所反映的裂隙含水层形变
Table 1 hanges of phase shift and amplitude of tide water-level,causes and deformation of aquifer zone
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