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定水头注水引起的含水层水平运动和应变 总被引：2，自引：2，他引：0
基于含水层固体颗粒与孔隙水不可压缩的假设 ,本文导出了单井注水情况下泰斯承压含水层水平运动速度与水头之间的基本关系式。然后利用注水井壁处的应力、应变边界条件 ,进一步导出了单井定水头注水引起的泰斯承压含水层水平运动速度、位移和应变解析表达式。该水平位移与应变由两部分组成 :一部分为由注水压力本身引起的经典弹性力学解项 ,它仅随半径而变化 ,与注水时间无关 ;另一部分为由地下水头变化引起的水动力学位移和应变解项。其中 ,含水层水动力学水平位移随时间加长呈指数增长特征 ,水动力学径向应变则表现为近井处拉张、远井处挤压的分区特征 ,且近井拉张区随时间加长逐渐向外扩展。单井注水含水层水动力学水平位移、应变解的导出 ,完善和发展了单孔内压经典弹性平面力学问题解 相似文献
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The Suzhou granite suite is the anorogenic product, which is located on the inactive continental margin of east China. It
was emplaced about 141 Ma ago, occurring as a stock with a polygonal outline on the surface, belonging to alkali potash-feldspar
granites with K2O > Na2O, Reit’s alkali coefficient = 0.694, SiO2 = 74.95, and Al2O3/(K2O + Na2O)mol= 1. Besides K and Na, Li and Rb are also rather high. Highlycharged metals such as Zr, Nb, REE, Y, Sn, Th, Ga and Zn are 10,
or even 50 times higher than those in the ordinary granites. Halogen elements such as F and Cl are high in abundance with
F = 2700 ppm and Cl = 170 ppm on average. The abundances of deep-source elements such as Ti, Al, Ca, Mg and P are relatively
low, with A12O3 = 12.65% and Ca + Mg < 1%. High Ga and low Al contents are typomorphically characteristic of A type granites.
Biotite in the rocks is, for the most part, annite, usually filling in quartz and feldspar crystals, indicating that the crystallization
of magma proceeded under relatively anhydrous condition.
More than 40 kinds of accessory minerals have been identified, of which the mantle-derived mineral chrompicotite and moissanite
is of great interest.
Two different intrusions, the major and supplementary intrusions, can be distinguished in the granite suite. The rock-forming
temperature is estimated to be 810°C, pressure 2.5 kbars, pH 8.1,18O/16O low(δ18OWR = 6.19‰), andfo2= 10−16. The abundances of REE are high and Eu depletion is remarkable (δEu = 0.24).
A variety of mineral deposits related to the Suzhou granite suite have been recognized. 相似文献
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计算机断层扫描成像(CT)技术具有成像速度快分辨率高的优点,广泛应用于医学临床诊断中.然而,提高剂量辐射会引发人体组织器官受损,降低剂量又会造成成像质量严重下降.为解决上述矛盾,在确保成像质量满足临床诊断需求的条件下,研究如何最大程度地降低X射线辐射对人体造成的伤害,己成为低剂量CT成像技术的研究热点.近年来,在人工智... 相似文献
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传统卡尔曼滤波算法要求噪声模型符合高斯分布，在UWB室内定位中，由于载体本身的机制等干扰，观测噪声不仅仅是白噪声，也存在有色噪声的情况，而粒子滤波可以处理有色噪声的问题。本文通过增加似然分布自适应调整来改进粒子滤波用于目标跟踪的精度，同时研究在白噪声、有色噪声下似然分布自适应调整粒子滤波和拓展卡尔曼滤波在UWB中的优势与不同。试验结果表明：观测噪声为白噪声时，拓展卡尔曼滤波和粒子滤波均可以较好地实现对行人的定位跟踪；观测噪声为有色噪声时，自适应粒子滤波定位效果优于粒子滤波、拓展卡尔曼滤波。 相似文献
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With hard roof conditions and the influence of side and front abutment pressures, pressure bump and large deformations periodically occur in the advanced support area of longwall face gob-side gateroads. To control the strong strata behaviours in gob-side gateroads, “directional hydraulic fracturing, to cut off the roof hanging over the adjacent gob area, and pre-fracturing of the roof, located behind the working face being extracted,” are performed. The directional initiation of hydraulic fracturing is controlled by pre-slotting, and this action guides the propagation of hydraulic fractures in three-dimensional space. The oriented fractures meet engineering requirements by cooperating with both the in situ ground stresses and the mining-induced stresses, as well as the technology of hydraulic fracturing. In field applications, hydraulic fracturing has proven to be a viable option for weakening hard roofs, destressing the side and front abutment pressures at the mining face and also transferring in situ and mining-induced stresses. Successful field tests in the Tongxin coal mine, Datong district, as well as other coal mines, show that hydraulic fracturing in both a hanging roof over an adjacent gob area and in the gob area behind the advancing working face controls the behaviour of strong strata material on the gob-side of gateroads in longwall mining and also guarantees safe extraction at the working face. 相似文献
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为了研究毛发长度和毛发密度对毛发缆减阻性能的影响，设计并进行了水池试验。通过研究6种不同毛发长度、不同毛发密度拖缆的阻力系数随航速的变化，找到减阻效果最优的缆型，得到最佳缆型的减阻率。结果显示：在相同的迎流角下，圆缆的阻力系数在1~1.1左右，毛发缆的阻力系数随速度变化不明显；在毛发长度为9~11倍拖缆直径、毛发密度为60根/m时，毛发缆的减阻效果最优，减阻率可达20%。验证了毛发缆具有很好的减阻性能，为大深度拖曳系统的缆型设计提供了参考依据。 相似文献
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