Shaking table test of subgrade slope reinforced by gravity retaining wall with geogrids     

Qu  Honglue  Huang  Xue  Gao  Yanan  Zhang  Zhe  Wang  Chenxu 《地震工程与工程振动(英文版)》2022,21(3):715-727

Gravity retaining wall with geogrids has showed excellent seismic performance from Wenchuan great earthquake. However, seismic damage mechanism of this kind of wall is not sufficiently clear. In view of this, a large shaking table test of the gravity retaining wall with geogrids to reinforce the subgrade slope was carried out, and based on the Hilbert-Huang transform and the marginal spectrum theory, the energy identification method of the slope dynamic failure mode was studied. The results show that the geogrids can effectively reduce displacement and rotation of the retaining wall, and it can effectively absorb the energy of the ground movement when combined with the surrounding soil. In addition, it also reveals the failure development of the gravity retaining wall with geogrids to reinforce the subgrade slope. The damage started in the deep zone near the geogrids, and then gradually extended to the surface of the subgrade slope and other zones, finally formed a continuous failure surface along the geogrids. The analysis results of the failure mode identified by the Hilbert marginal spectrum are in good consistency with the experimental results, which prove that the Hilbert marginal spectrum can be applied to obtain the seismic damage mechanism of slope.

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库车坳陷克拉苏构造带协同变形机制及盆山耦合关系     

刘立炜  周慧  张承泽  闫炳旭  杨凤来  屈元基 《地质科学》2022,57(1):61-72

克拉苏构造带构造非常复杂,经过30余年的油气勘探开发,构造规律不清楚、构造圈闭不落实的问题仍然非常突出。本文通过大量三维地震资料的构造解释、建模及实钻资料验证,发现克拉苏构造带在剖面上呈分段分层变形、平面上呈雁列式展布特征。提出克拉苏构造带两种协同变形机制,较好地解释了在膏盐层调节作用下盐上、盐层、盐下3个构造层的差异变形现象。结合遥感影像及重力异常影像分析了盆山耦合关系,提出了南天山造山带的差异隆升推覆作用,南部温宿、新和、牙哈古隆起的阻挡作用和古近系膏盐层的调节作用是变形的3个主要影响因素,并据此较好地解释了克拉苏构造带构造圈闭平面展布格局。  相似文献   

Design of optimal sand fences around a desert solar park—a case study from Phase IV of the Mohammed bin Rashid Al Maktoum Solar Park     

Yao  Zhengyi  Xiao  Jianhua  Xie  Xiaosong  Zhu  Haijun  Qu  Jianjun 《Natural Hazards》2022,113(1):673-697

Natural Hazards - Solar energy parks in desert areas must resist the encroachment of moving sand and burial by migrating dunes. It is therefore important to design economical, effective sand fences...  相似文献   

Research on Reasonable Width of Coal Pillars of Non-equal Width Isolated Working Face Heading Goaf in Deep Mine     

Yang  Weili  Wei  Quande  Wang  Zhonghui  Zhang  Zhizeng  Qu  Xiaocheng  Wen  Jinglin 《Geotechnical and Geological Engineering》2022,40(3):1295-1306

Geotechnical and Geological Engineering - Setting reasonable coal pillar is a key to ensure safe mining of island coal face heading goaf in deep mine. With the background of typical deeply buried...  相似文献   

二连盆地早白垩世断陷及基底构造的耦合性   总被引：3，自引：0，他引：3       下载免费PDF全文

李先平  张少华  李林波  杨明慧  卢永合  周多  屈晓艳 《地质科学》2015,50(1):88-99

基底构造在沉积盆地的形成与演化过程中扮演着重要的角色。本文利用地球物理资料和地表地质调查数据,对二连盆地早白垩世断陷分布规律与基底构造特征及其关系进行了研究,并分析了基底构造对富油凹陷的控制作用。结果表明,二连盆地早白垩世68个断陷总体上自北东向南西呈弥散式分布,这些断陷可分为南部断陷群与北部断陷群,断陷群夹持在隆起之间,总体上构成了正负相间的盆岭构造格局。基底构造控制着二连盆地早白垩世断陷分布,表现为:断陷群沿着深断裂分布;坳陷对应着基底先存复向斜,隆起对应着基底先存复背斜;刚性的锡林浩特地块分割了断陷群。深断裂作为构造薄弱区在伸展变形过程中优先重新活动,并控制着断陷的发育与分布;盖层演化和基底构造之间具有良好的继承性;基底流变性发生突变的区带对断陷的发育与分布也具有控制作用。盆地基底断裂带上叠的凹陷、基底断裂带交汇处上叠的凹陷和刚性基底上新生的凹陷在伸展变形过程中构造继承性好、沉降量大、优质烃源岩发育,是富油凹陷发育的有利区域。  相似文献   

An Review of International Climate Change Conference and Analysis on Recent Hot Issues     

Zeng Jingjing  Qu Jiansheng  Pei Huijuan  Dong Liping  Liao Qin  Liu Yanfei  Zhang Zhiqiang 《地球科学进展》2015,30(11):1210-1217

The international climate change negotiation has been carried out over 20 years. The issue of climate change has shifted from a scientific question into a complex political matter which is related to the sustainable development of mankind. Based on the overview of major processes and stages of international climate conferences, this paper analyzed the key measures that major countries have taken to address climate change, as well as the primary tasks of Paris climate conference and recent international actions. The recent international climate policy issues were also analyzed in order to provide suggestions for China’s activel participation in the development of a new round of international climate change system.  相似文献   

Evolution process of sediment supply for debris flow occurrence in the Longchi area of Dujiangyan City after the Wenchuan earthquake     

Ming Chang  Chuan Tang  Huayong Ni  Yongping Qu 《Landslides》2015,12(3):611-623

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黑龙江省封冻前土壤底墒趋势变化分析     

朱海霞  纪仰慧  宫丽娟  吕佳佳  曲辉辉  李百超 《气象科技》2013,41(1):196-201

利用黑龙江省1981-2010年的土壤湿度数据,以富锦县、龙江县、双城县、黑河市、海伦县为代表点,分析了黑龙江省东、西、南、北、中各区域封冻前(11月8日)0～30 cm土层土壤湿度的趋势变化和干湿变化,采用线性趋势、5年滑动平均和Mann-Kendall法检验变化趋势,利用Mann-Kendall和Yamamoto法对土壤湿度变化趋势进行突变点检验.结果表明:封冻前0～30 cm土层各地土壤湿度在30年间均有不同程度下降,西部龙江县下降剧烈,中部海伦县较剧烈,北部黑河市和南部双城县次之,上述代表点20 cm土层土壤湿度下降均达到了P＜0.05以内的显著水平,东部富锦县下降趋势最弱;经Mann-Kendall法检验,0～30 cm土层龙江县、海伦县土壤湿度出现了下降的突变区域,其余代表点的土壤湿度变化趋势在近几年中逐渐接近或已经超越了显著线;1994年是龙江县10 cm、20 cm土壤湿度下降的突变时期;黑龙江省各地土壤湿度的下降与封冻前一段时期内气温和降水变化密切相关,还与土壤物理性质的恶化等因素有关.  相似文献   

河北省南部电网夏季电力负荷特征及与气象因子的关系   总被引：1，自引：0，他引：1  

武辉芹  张金满  曲晓黎 《气象科技》2013,41(5):945-948

利用河北省南部电力公司提供的2007-2009年南电网区域逐日最大用电负荷资料,分析了南电网区域夏季日最大负荷变化规律,与其他月份相比,夏季5-8月的日最大电力负荷的波动性明显大于其他月份.采用标准化和相关分析法,逐月分析了气象因子与日最大电力负荷的相关性,并找出了日最大电力负荷的周变化特点,以及节假日对日最大电力负荷的影响.结合农作物生长特点,分析了南部电网日最大电力负荷变化特征,为以后日最大电力负荷预报提供了一定的参考.  相似文献   

Statistical properties of twin kilohertz quasi‐periodic oscillations in neutron star low‐mass X‐ray binaries     

D. H. Wang  L. Chen  C. M. Zhang  Y. J. Lei  J. L. Qu 《Astronomische Nachrichten》2014,335(2):168-177

We collect the data of twin kilohertz quasi‐periodic oscillations (kHz QPOs) published before 2012 from 26 neutron star (NS) low‐mass X‐ray binary (LMXB) sources, then we analyze the centroid frequency (ν) distribution of twin kHz QPOs (lower frequency ν₁ and upper frequency ν₂) both for Atoll and Z sources. For the data without shift‐and‐add, we find that Atoll and Z sources show different distributions of ν₁, ν₂ and ν₂/ν₁, but the same distribution of Δν (difference of twin kHz QPOs), which indicates that twin kHz QPOs may share the common properties of LXMBs and have the same physical origins. The distribution of Δν is quite different from a constant value, so is ν 2/ν₁ from a constant ratio. The weighted mean values and maxima of ν₁ and ν₂ in Atoll sources are slightly higher than those in Z sources. We also find that shift‐and‐add technique can reconstruct the distributions of ν₁ and Δν. The K‐S test results of ν₁ and Δν between Atoll and Z sources from data with shift‐and‐add are quite different from those without it, and we think that this may be caused by the selection biases of the sample. We also study the properties of the quality factor (Q) and the root‐meansquared (rms) amplitude of 4U 0614+09 with data from the two observational methods, but the errors are too big to make a robust conclusion. The NS spin frequency (ν_s) distribution of 28 NS‐LMXBs show a bigger mean value (∼408 Hz) than that (∼281 Hz) of the radio binary millisecond pulsars (MSPs), which may be due to the lack of the spin detections from Z sources (systematically lower than 281 Hz). Furthermore, on the relations between the kHz QPOs and NS spin frequency ν_s, we find the approximate correlations of the mean values of Δν with NS spin and its half, respectively. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)  相似文献