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振动能量下砂土的体变与孔隙水压力 总被引:4,自引:0,他引:4
本文建立了砂土在振动能量下的体积变化和孔隙水压力生长的新型本构关系。鉴于砂土的非线性振动反应和多因素的影响,文中采用了内缓变理论(Endochronic Theory)将本构关系表达为单一的内缓变量(软化参数)的函数。 试验证明在基于建议的本构关系计算的孔隙水压力值与相应的振动能量下,福建标准砂试样中产生的孔隙水压力很接近。同时又根据该本构关系预估了实际地震能量下饱水砂层中孔隙水压力的反应,回判地震液化势,获得了较满意的结果,具有一定的实用性。 相似文献
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A groundwater observational network for monitoring seismic precursors has been established at the reservoirs on the lower reaches of the Jinsha River in southwestern China, where a series of hydropower stations are under construction. It is the second network in China that is operated by enterprises with the purpose to observe and study earthquake precursors in reservoir areas. This paper presents the layout and technical constitution of the network, features of its observational wells and aquifers and the preliminary result of its experimental operation. Its capability to monitor seismic precursor is evaluated based on an analysis of the well-aquifer system as well as the multiple-monthly, monthly, daily and hourly variations of water levels and water temperatures observed by this network. 相似文献
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金沙江水网对日本9.0级地震的同震响应及其特征与机理 总被引:1,自引:0,他引:1
本文系统介绍了金沙江水网6口观测井水位与水温动态对日本9.0级地震的同震响应, 分析了同震响应的特征与同震响应的机理。 结果表明, 4口井水位有同震响应, 同震响应形态全是振荡, 对地震波响应的时间、 振荡的幅度、 振荡的持续时间等的差异主要取决于井-含水层系统的导水系数。 结果还表明, 3口井水温有同震响应, 响应形态是不对称的V字或U字形; 水温的先期下降是井筒内上(冷)下(热)水混合作用引起的, 后期上升是井水与围岩之间的热传导引起吸热作用的结果, 各井水温升降的幅度、 持续时间等不同, 主要是井水温度梯度与水岩热传导系数不同引起的; 后期升幅总是大于先期降幅, 这可能与地震波作用使井区大地热流增强有关。 相似文献
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Fine measurements have been conducted to temperatures and their gradients of six wells of the Jinsha River Groundwater Observational Network.The results show that the influence depths of sun radiation heat are 50m to 125m,average temperature gradients in the wells range from 0.11 to 2.81℃/hm and most are 1~2℃/hm,and the temperature gradients on varied depth sections of one well are highly changeable.Lithology of strata and their integrity,particularly high-angle crashed fault zones,have imposed major effects on the influence depths of sun radiation heat and temperature gradients of the wells.The micro dynamic characteristics of water temperature,such as coseismic effects,tidal effects and anomalies of the wells prior to earthquakes,probably depend,to a large degree,on the temperature gradients of the depths at which the water temperature sensors are settled. 相似文献
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根据2008年9月至2013年10月金沙江下游水库地震台网监测资料,分析了蓄水期间水库地震影响区的地震活动和震源机制。向家坝水库蓄水1年多,蓄水后库首区A、B段的地震活动频次和强度都维持在较低水平。蓄水期间地震活动显著增加,集中分布在库区C段,并不是蓄水初期地震活动就增加,与库区2013年6月启动第二阶段蓄水有一定相关性,强度在3级地震活动水平。增加的地震活动位于近南北走向的翼子坝、玛瑙断裂的中段。这些局部地段蓄水后发生的地震,其震源的力学机制多为倾滑或正断型,分析认为部分地震为水库诱发岩溶或塌陷型地震,多数仍属构造地震。本文结果为水库诱发地震的研究提供了资料和震例。 相似文献
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