固体潮汐对边坡稳定性系数的影响及其时间效应的研究
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摘要
固体潮汐的研究是地球物理领域的研究热点,与地震预报的联系也十分紧密。借鉴固体潮汐与地震相关性的研究成果,建立了弹性地球模型,从固体潮理论出发,推导出地表潮汐应力的表达式。通过在常见的边坡破坏模式稳定性系数计算公式加入固体潮汐应力的作用,并选取典型算例,阐述固体潮对边坡稳定性及其时间效应的影响,论证了边坡的稳定性具有日周期变化的特征,提出在边坡防护的设计中应适当的考虑固体潮汐带来的影响。
The researches on time of landslide occurrence have been the hotspot in the landslide area,and most of them mainly focus on the rainfall season.However,few scientists consider the diurnal period properties of slope stability caused by earth tide.The earth tide is always the hotspot in the geophysics field,and it relates to earthquakes strongly.The formulas for tidal stress at the surface of earth are derived by modifying a simplified elastic earth model based on the earth tide theory.The effect of earth tides on slope stability and its time correlation are discussed by considering the tidal stress in the formulas for safety factor of slope stability commonly used,and typical slopes in Nanjing City are taken as examples.The suggestion of taking the effects of earth tide into account in the protection of slopes is proposed.
The researches on time of landslide occurrence have been the hotspot in the landslide area,and most of them mainly focus on the rainfall season.However,few scientists consider the diurnal period properties of slope stability caused by earth tide.The earth tide is always the hotspot in the geophysics field,and it relates to earthquakes strongly.The formulas for tidal stress at the surface of earth are derived by modifying a simplified elastic earth model based on the earth tide theory.The effect of earth tides on slope stability and its time correlation are discussed by considering the tidal stress in the formulas for safety factor of slope stability commonly used,and typical slopes in Nanjing City are taken as examples.The suggestion of taking the effects of earth tide into account in the protection of slopes is proposed.
引文
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[14]DAVID G.An alternative lunar ephemeris model for on-board flight software Use.1999 Flight Mechanics Symposium,NASA GSFC.
[2]樊晓一,乔建平.三峡水库区滑坡时间记录的R/S分析[J].中国地质灾害与防治学报,2006,17(2).(FAN Xiao-yi,QIAO Jian-ping.R/S analysis of landslide time record in the Three Gorges Reservior Area[J].Chinese Journal of Geological Hazard and Control,2006,17(2).(in Chinese))
[3]李军,周成虎,许增旺.香港岛地区滑坡灾害的时空分布模式[J].山地学报,2001,19(3):248–252.(LI Jun,ZHOU Cheng-hu,XU Zeng-wang.Temporal and spatial distribution patterns of landslides in hong kong island[J].Journal of Mountain Science,2001,19(3):248–252.(in Chinese))
[4]杨媛媛,黄宏伟.四川省滑坡灾害记录分析[J].岩石力学与工程学报,2005,24(增刊2):5366–5370.(YANG Yuan-yuan,HUANG Hong-wei.Landslide hazard probability analysis for Sichuan province using landslide inventory[J].Chinese Journal of Rock Mechanics and Enginveering,2005,24(S2):5366–5370.(in Chinese))
[5]于玉贞,林鸿州,李广信.边坡滑动预测的有限元分析[J].岩土工程学报,2007,29(8):1264–1267.(YU Yu-zhen,LIN Hung-chou,LI Guang-xin.Analysis of finite element method for early warning of landslide[J].Chinese Journal of Geotechnical Engineering,2007,29(8):1264–1267.(in Chinese))
[6]山田剛二,渡正亮,小橋澄治。地すべり.斜面崩壞の実態と对策[M].東京:山海堂,1971.(in Japanese)
[7]COCHRAN E S,VIDALE J E,TANAKA S.Earth tides can trigger shallow thrust fault earthquakes[J].Science 2004,306:1164–1166.
[8]DIETERICH J H.Nucleation and triggering of earthquake slip:effect of periodic stresses[J].Tectonophysics,1987,144:127–139.
[9]LOCKNER D A,BEELER D A.Premonitory slip and tidal triggering of earthquakes[J].J Geophys Res,1999,104(B9):20133–20151.
[10]SAUBER J M,B.F.MOLNIA B F.Glacier ice mass fluctuations and fault instability in tectonically active Southern Alaska[J].Glob Plane Change,2004,42:279–293.
[11]TANAKA S,OHTAKE M,SATO H.Evidence for tidal triggering of earthquakes as revealed from statistical analysis of global data[J].J Geophys Res,2002,107(B10):2211.
[12]WILCOCK W S.Tidal triggering of microearthquakes on the Juan de Fuca Ridge[J].Geophys Res Lett,2001 28:3999–4002.
[13]TANAKA S,SATO H,MATSUMURA S,et al.Tidal triggering of earthquakes in the subducting Philippine Sea plate beneath the locked zone of the plate interface in the Tokai region,Japan[J].Tectonophysics,2006,417(1-2):69–80.
[14]DAVID G.An alternative lunar ephemeris model for on-board flight software Use.1999 Flight Mechanics Symposium,NASA GSFC.
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