3D IN-SITU CRUSTAL STRESS MEASUREMENT AND ITS APPLICATION TO UNDERGROUND WATER-SEALED OIL STORAGE CAVE ENGINEERING
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摘要: 地下水封油库是一种复杂的地下工程, 在施工期间开展岩体原位应力三维测量, 对设计的开挖和支护方案进行检验和复核, 有利于设计优化和指导施工。采用水压致裂测量方法, 在油库内南北水平、东西水平和垂直3个方向钻探成孔进行地应力测量, 综合3个方向的地应力测量结果, 计算确定三维地应力大小和方向。计算结果验证了设计所使用的勘察阶段地应力测量结果的可靠性, 检验和复核了设计施工方案的合理性, 并进一步评价了地下水封油库围岩稳定性。Abstract: Underground water-sealed oil storage cave is a complex underground project. 3D in-situ crustal stress measurement in the constructing process, which can be used to test and re-check for the design scheme of cave excavation and support, is advantageous to the design optimization and the construction. In-situ crustal stress measurements by hydrofracturing method in drilling boreholes along a three dimensional Cartesian coordinate system are conducted, and then the reliable 3D crustal stress magnitudes and directions are calculated from those measuring results. This 3D results examined the in-situ measurements at surveying stage used for designing, and verified the rationality of the design and construction scheme. In addition, the stability of surrounding rock of underground water-sealed oil storage cave was further assessed using the 3D results.
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图 1 锦州某地下水封油库内地应力测点钻孔布置示意图
Figure 1. The sketch map showing the arrangement of drilling boreholes for in-situ crustal stress measurement in an underground water-sealed oil storage cave in Jinzhou city
图 2 JZNS-1(左)与JZWE-2(右)实测主应力大小随水平深度变化
Figure 2. Variation of measured principal stress magnitudes along with horizontal depth in JZNS-1 and JZWE-2 boreholes
图 4 JZVZK-3实测主应力大小随垂直深度变化趋势
Figure 4. The variation of measured principal stress magnitudes along with vertical depth in JZVZK-3 borehole
图 5 锦州某地下水封油库内水压致裂三维地应力测量结果
Figure 5. The results of 3D crustal stress measurements using hydrofracturing method in an underground water-sealed oil storage cave in Jinzhou city
图 6 锦州某地下水封油库勘察阶段垂直钻孔地应力测量主应力大小随深度变化
Figure 6. The variation of principal stress magnitudes obtained at surveying stage along with depth in vertical drilling boreholes of an underground water-sealed oil storage cave in Jinzhou city
图 7 锦州某地下水封油库垂直钻孔最大水平主应力方向随深度变化
Figure 7. The variation of maximum horizontal principal stress orientations along with depth in vertical drilling boreholes of an underground water-sealed oil storage cave in Jinzhou city
图 8 区域最大、最小水平主应力方向玫瑰花图
Figure 8. The rose diagram of regional maximum and minimum horizontal principal stress directions
表 1 锦州某地下水封油库水平钻孔JZNS-1水压致裂应力测量结果
Table 1. The hydrofracturing crustal stress measurements of JZNS-1 horizontal borehole in an underground water-sealed oil storage cave in Jinzhou city
序号 测试段深度/m 压裂参数/MPa 应力值/MPa S′H方向/(°) Pb Pr Ps PH P0 T S′H S′h 1 4.60~5.15 17.63 3.37 3.78 0.00 0.00 14.26 7.97 3.78 2 6.60~7.15 18.29 3.93 4.09 0.00 0.00 14.36 8.34 4.09 3 8.60~9.15 17.31 4.64 4.31 0.00 0.00 12.67 8.29 4.31 4 12.60~13.15 17.95 3.80 4.25 0.00 0.00 14.15 8.95 4.25 5 14.60~15.15 14.33 4.50 4.38 0.00 0.00 9.83 8.64 4.38 6 16.60~17.15 20.41 3.94 4.31 0.00 0.00 16.47 8.99 4.31 7 18.60~19.15 19.14 4.50 4.61 0.00 0.00 14.64 9.33 4.61 8 20.60~21.15 9.23 4.89 4.87 0.00 0.00 4.34 9.72 4.87 9 22.60~23.15 12.93 5.18 4.94 0.00 0.00 7.75 9.64 4.94 10 24.60~25.15 11.65 3.64 2.85 0.00 0.00 8.01 4.91 2.85 11 26.60~27.15 18.52 3.88 3.91 0.00 0.00 14.64 7.85 3.91 13 12 28.30~28.85 12.85 4.01 3.93 0.00 0.00 8.84 7.78 3.93 18 
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表 2 锦州地下水封油库水平钻孔JZWE-2水压致裂应力测量结果
Table 2. The hydrofracturing crustal stress measurements of JZWE-2 horizontal borehole in an underground water-sealed oil storage cave in Jinzhou city
序号 测试段深度/m 压裂参数/MPa 应力值/MPa S′H方向/(°) Pb Pr Ps PH P0 T S′H S′h 1 4.60~5.15 17.12 4.95 4.35 0.00 0.00 12.17 8.10 4.35 2 6.60~7.15 17.20 4.71 4.82 0.00 0.00 12.49 9.75 4.82 3 8.60~9.15 17.16 5.30 4.77 0.00 0.00 11.86 9.01 4.77 4 10.60~11.15 16.93 5.26 5.08 0.00 0.00 11.67 9.98 5.08 5 12.60~13.15 15.70 5.12 4.89 0.00 0.00 10.58 9.55 4.89 6 14.60~15.15 16.73 4.72 4.52 0.00 0.00 12.01 8.84 4.52 7 16.60~17.15 16.77 4.70 4.42 0.00 0.00 12.07 8.56 4.42 8 18.60~19.15 16.83 4.45 4.69 0.00 0.00 12.38 9.62 4.69 9 20.60~21.15 17.45 4.58 4.77 0.00 0.00 12.87 9.73 4.77 10 22.60~23.15 17.49 4.90 5.01 0.00 0.00 12.59 10.13 5.01 11 24.60~25.15 18.83 4.40 4.25 0.00 0.00 14.43 8.35 4.25 12 26.60~27.15 20.17 4.89 5.30 0.00 0.00 15.28 11.01 5.30 15 13 28.60~29.15 16.71 5.34 5.15 0.00 0.00 11.37 10.11 5.15 25
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表 3 锦州地下水封油库垂直钻孔JZVZK-3水压致裂应力测量结果
Table 3. The hydrofracturing crustal stress measurements of JZVZK-3 vertical borehole in an underground water-sealed oil storage cave in Jinzhou city
序号 测试段深度/m 压裂参数/MPa 应力值/MPa SH方向/(°) Pb Pr Ps PH P0 T SH Sh SV 1 6.60~7.15 17.12 4.79 4.42 0.06 0.06 12.33 8.41 4.42 3.09 N84°E 2 10.60~11.15 16.19 4.62 4.03 0.10 0.10 11.57 7.37 4.03 3.20 N58°W 3 14.60~15.15 15.64 3.94 3.57 0.14 0.14 11.70 6.63 3.57 3.31 4 18.60~19.15 13.87 3.98 3.88 0.18 0.18 9.89 7.48 3.88 3.42 5 22.60~23.15 15.68 4.02 3.96 0.22 0.22 11.66 7.64 3.96 3.53 N67°E 6 26.60~27.15 16.93 4.76 4.56 0.26 0.26 12.17 8.66 4.56 3.63 7 30.60~31.15 18.41 5.80 5.58 0.30 0.30 12.61 10.64 5.58 3.74 N83°E 8 34.60~35.15 20.28 7.23 6.61 0.34 0.34 13.05 12.26 6.61 3.85 N88°E 9 38.60~39.15 14.32 5.68 5.66 0.38 0.38 8.64 10.92 5.66 3.96 10 44.60~45.15 18.40 5.74 5.64 0.44 0.44 12.66 10.74 5.64 4.12 11 48.60~49.15 17.58 6.54 6.22 0.48 0.48 11.04 11.64 6.22 4.23 N76°E 12 52.60~53.15 20.87 7.60 7.33 0.52 0.52 13.27 13.87 7.33 4.34 N87°W 13 56.60~57.15 21.90 8.91 8.93 0.55 0.55 12.99 17.33 8.93 4.44
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表 4 锦州某地下水封油库三维应力计算结果
Table 4. The 3D crustal stress calculated results in an underground water-sealed oil storage cave in Jinzhou city
主应力 量值/MPa 方位角/(°) 仰角/(°) 倾伏向 最大主应力(σ1) 11.56 59.86 12.32 NEE 中间主应力(σ2) 5.84 329.82 11.70 NNW 最小主应力(σ3) 3.07 0.27 -78.18 SN
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表 5 锦州某地下水封油库垂直钻孔地应力测量最大水平主应力方向统计
Table 5. The statistics of maximum horizontal principal stress orientations in an underground water-sealed oil storage cave in Jinzhou city
孔号 印模段中心深度/m 最大水平主应力方向 ZK1 79.5 N78°E 115.5 N33°E 132.5 N72°W ZK3 41.0 N73°E 85.0 N79°E 115.0 N86°E ZK8 78.7 N62°E 93.0 N65°E 104.2 N68°E 113.2 N54°W ZK12 43.7 N82°E 69.3 N71°E 99.0 N62°E ZK11 65.5 N77°E 103.5 N67°E 121.5 N87°E 133.9 N83°E JZVZK-3 116.9 N84°E 120.9 N58°W 122.9 N67°E 130.9 N83°E 134.9 N88°E 148.9 N76°E 152.9 N87°W
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