丹江口库区水压应力场的有限元模拟
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摘要
根据丹江口水库区的地质特征建立三维有限元模型模拟计算水压应力场和应变场,分析水库蓄水后断层的稳定情况及库水载荷对库盆岩体中应力应变状态的影响,并预测丹江口水库二期工程诱发地震的可能性与危险区。研究结果表明,库水载荷不可能直接诱发水库地震,而是通过对岩石的软化和断层的润滑间接诱发地震。蓄水后瓦房厂—周山断裂出现张开现象,丹江断裂滑移增大,稳定性降低;均郧断裂和公路断裂面压应力增加,滑移减小,从而变得更加稳定。水库二期工程后汉江库区诱发地震的机率很小,但丹江口库区有可能诱发地震,可能性较大地区为厚坡、九重、彭桥、仓房和田川。
The 3-D finite element model for analyzing the hydraulic-pressure stress-strain field of Danjiangkou Reservoir area is established according to the geological characteristics. The stability of faults and the influence of water load on stress state of reservoir rock mass after the reservoir impoundment are analyzed. Furthermore, the probable reservoir induced earthquake and the regions with potential risk are predicted. The analysis shows that the load of reservoir water will not induce earthquake directly, but it will result in the softening of rock or slip of faults and leads to indirect earthquake. The possibility of induced earthquake occurred to the Hanjiang River storage region in the second stage project of the Danjiangkou Reservoir is insignificant, but the possibility of the Danjiang River storage region is much higher.
The 3-D finite element model for analyzing the hydraulic-pressure stress-strain field of Danjiangkou Reservoir area is established according to the geological characteristics. The stability of faults and the influence of water load on stress state of reservoir rock mass after the reservoir impoundment are analyzed. Furthermore, the probable reservoir induced earthquake and the regions with potential risk are predicted. The analysis shows that the load of reservoir water will not induce earthquake directly, but it will result in the softening of rock or slip of faults and leads to indirect earthquake. The possibility of induced earthquake occurred to the Hanjiang River storage region in the second stage project of the Danjiangkou Reservoir is insignificant, but the possibility of the Danjiang River storage region is much higher.
引文
[1]易立新,车用太,王广才.水库诱发地震研究的历史、现状和发展趋势[J].华南地震,2003,23(1):28-37.
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[4]刘世凯,涂光美,孙云志.三峡水库应力场对水田坝断裂影响的数学力学模型研究[J].工程地质学报,1996,4(3):53-58.
[5]周创兵,熊文林.地应力对裂隙岩体渗透特性的影响[J].地震学报,1997,19(2):154-163.
[6]黄乃安,张绍波.丹江口水库诱发地震趋势研究[J].华南地震,1991,11(4):67-74.
[7]高锡铭,殷志山.汉江丹江口水库的地震活动[A].见:国家地震局地震研究所,丹江口水库诱发地震文集[C].北京:地震出版社,1980.80-89.
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[9]李祖武.丹江口水库区地震的形成条件与发展趋势的讨论[J].西北地震学报,1981,3(2):78-88.
[10]刘素梅.丹江口水库诱发地震应力场研究[D].武汉:武汉理工大学,2002.
[2][印]H.K.古普塔,B.K.拉斯托吉.水坝与地震[M].北京:地震出版杜,1980.
[3]高士钧,陈永成,高文梅,等.丹江口水库水压应力场、位移场及地震[J].地震学报,1981,12(2):81-90.
[4]刘世凯,涂光美,孙云志.三峡水库应力场对水田坝断裂影响的数学力学模型研究[J].工程地质学报,1996,4(3):53-58.
[5]周创兵,熊文林.地应力对裂隙岩体渗透特性的影响[J].地震学报,1997,19(2):154-163.
[6]黄乃安,张绍波.丹江口水库诱发地震趋势研究[J].华南地震,1991,11(4):67-74.
[7]高锡铭,殷志山.汉江丹江口水库的地震活动[A].见:国家地震局地震研究所,丹江口水库诱发地震文集[C].北京:地震出版社,1980.80-89.
[8]李.三峡、丹江口地区地震地质研究[M].北京:地震出版社,1994.
[9]李祖武.丹江口水库区地震的形成条件与发展趋势的讨论[J].西北地震学报,1981,3(2):78-88.
[10]刘素梅.丹江口水库诱发地震应力场研究[D].武汉:武汉理工大学,2002.
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