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Acta Geotechnica - Deformations in deep excavations can be controlled by providing adjustable support using servo struts; however, the design of strut positions and applied forces remains to be... 相似文献
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Acta Geotechnica - A deep foundation pit constructed in unsaturated soils had encountered torrential rainfall during excavation, and measurements indicated an unexpected excavation deformation... 相似文献
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The construction of diaphragm wall panels can cause the stress change and soil movements in adjacent ground. In this paper, the construction sequence of a typical diaphragm wall panel in saturated soft clay is simulated with a 3D finite element program. The soil is assumed to behave as an isotropic linear elastic/Mohr–Coulomb plastic material with a soil–water coupled consolidation response. Influence of the pore water pressure is concerned to consider the consolidation behavior of the saturated soft clay. The analysis shows that the changes in effective horizontal stress and pore water pressure during diaphragm wall installation depend on arching mechanism and permeability. The variation in stresses and movements of ground computed by the coupled consolidation analysis and the total stress analysis are compared. Influences of the permeability coefficient on the installation effects are discussed by parametric studies. Finally, a case study of a diaphragm wall construction in Shanghai, in which the ground settlements were monitored, is presented to illustrate the prediction procedure of coupled consolidation analysis. 相似文献
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Xiang-Lian Zhou Jun Zhang Hao-Jie Lv Jin-Jian Chen Jian-Hua Wang 《Marine Georesources & Geotechnology》2018,36(8):974-985
Research on the response of random wave on offshore structures has received great deal of attention of many researchers and engineers in the design of marine structures. Most previous investigations have been limited to the regular waves. In this paper, based on Longuet–Higgins random wave theory and finite element method, a numerical model for random wave-induced seabed response is established. The seabed is treated as poroelastic medium and characterized by Biot’s partly dynamic equations (u–p model). The JONSWAP spectrum is adopted in Longuet–Higgins model, which is based on the cumulative superposition of linear diffraction solution. Based on the numerical results, the effects of random wave on seabed response are investigated by comparing with the corresponding Stokes wave and cnoidal wave. Then, a parametric study is conducted to examine the effect of wave and soil characteristic on the seabed. 相似文献
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气候变化可能不会引起我国北方冬小麦营养品质下降 总被引：1，自引：0，他引：1
为了探索未来气候变化对冬小麦营养品质的影响,采用开顶式气室与红外辐射器相结合的方法开展了冬小麦生长季增温和CO2浓度升高的复合影响试验,在6个小麦生长季模拟了21世纪中后期两种可能的增温和CO2浓度升高情景。结果表明,在生长季增温与CO2浓度升高情景下,冬小麦冬后发育期前移,生育期平均气温较对照的增加幅度远小于生长季增温幅度,灌浆期遭遇的高温日数减少,主要生育阶段的平均太阳辐射强度减弱。在增温与CO2浓度升高复合影响下,冬小麦籽粒蛋白质含量略有增加,籽粒淀粉与脂肪含量未显示规律性的变化趋势,增温对小麦蛋白质含量的综合影响弥补了CO2浓度升高对籽粒蛋白质含量的负效应。如果不考虑小麦品种变化影响,预计未来气候变化可能不会导致我国北方冬小麦籽粒营养品质下降。 相似文献
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CMIP6不同分辨率全球气候模式对中国降水模拟能力评估 总被引：1，自引：0，他引：1
基于参与CMIP6高分辨率模式比较计划（HighResMIP）9个模式组的18个全球气候模式模拟数据,通过与CN05.1观测资料的对比,评估了不同分辨率气候模式对中国区域1961—2014年降水特征的模拟能力。结果表明：低、高分辨率模式均能模拟出中国区域多年平均降水的总体空间分布特征,以及降水冬弱夏强的季节变化特征,但对降水的模拟都存在系统性偏多的误差;与低分辨率模式结果相比,高分辨率模式对降水空间分布的模拟有明显改善,在青藏高原、华北、华南地区降水模拟的系统性偏差明显减小;与低分辨率模式结果相比,高分辨率模式对年循环变化的模拟效果也更好,多年平均1月及9—12月逐月降水以及年降水的模拟误差均有所减小。对于年际、年代际的前两个主导空间模态,低、高分辨率模式大多无法模拟年代际的第一模态,但对于年际前两个模态以及年代际第二模态,分辨率提高可使半数左右模式组的模拟能力有所改善。 相似文献
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