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91.
92.
Monitoring ground subsidence induced by salt mining in the city of Tuzla (Bosnia and Herzegovina) 总被引:1,自引:0,他引:1
Salt mining induced ground subsidence is a major hazard in the city of Tuzla (Northeastern sector of Bosnia and Herzegovina)
and its surroundings since 1950, when solution mining of salt deposits by boreholes began. An analysis of the large (and never
before processed) amount of topographical data collected during two periods: from 1956 to the Balkan War, and from 1992 to
2003 has been made. The analysis reveals a cumulative subsidence as high as 12 m during the whole period, causing damage to
buildings and infrastructures within an area that includes a large portion of the historical town. Human-induced subsidence,
(with rates up to 40 cm/year in the most developed area), has been investigated to recognize the areas affected by the sinking
phenomenon and to produce a subsidence hazard. The time series of topographical observations have been enlarged by conducting
new surveys in the urban area by modern space-geodesy methodologies, such as static relative GPS (Global Positioning System)
and high resolution satellite imageries. The GPS monitoring started in 2004 and detected a decrease in the subsidence rates
to 20 cm/year related to the reduction of salt exploitation. There is close correlation between the average subsidence rate
and the annual amount of salt extracted. 相似文献
93.
The paper focuses on the behaviour of a model strip footing, resting on a saturated dense sandy soil, subjected to centred
or eccentric vertical loading. Experimental tests, carried out on a small-scale physical model, are able to reproduce effective
stress levels equivalent to those prevailing in prototype problems, thanks to the maintenance of a downward steady-state seepage
in the soil. The test program consists of three series of tests, each corresponding to an imposed value of hydraulic gradient,
and each involving five load eccentricities; one series, in particular, is carried out with still water. Relevant points of
load–settlement curves are related to the evolution of soil-footing collapse mechanism, evidenced by the distortion of some
vertical coloured sand strips. The collapse mechanism is formed either by one or two sliding surfaces, depending on both load
eccentricities and hydraulic gradient values. Significant differences are shown to occur between centred and eccentric loading
footing response. Shear strength parameters obtained from back-analyses carried out on load values recorded at the appearance
of each sliding surface on the free soil surface, in both hypotheses of associated and non-associated flow rule validity,
are adopted to draw, for each test, a theoretical collapse mechanism consisting, in plane strain, of a log-spiral line with
adjacent-end tangents; the obtained theoretical sliding surfaces, in turn, are compared to the experimental ones, showing
that these latter are either stress characteristic or zero-extension lines depending mainly on cumulative footing displacements
and current effective stress level in the soil. 相似文献
94.
95.
2019年8月2日河北省唐山市路南区某矿井区发生ML2.4巷道塌陷,基于塌陷周边台站观测到的短周期瑞雷波,提取面波基阶群速度频散曲线,并利用迭代反演方法得到研究区域地下10 km深度范围内的一维剪切波速度结构,用于精定位分析。速度分析结果表明,研究区域浅表剪切波速度约为2.46 km/s;深度为2 km时,塌陷周边存在小范围的低速区,速度约为2.57 km/s;深度约为4 km时,剪切波速度达3.47 km/s;深度为5~9 km时,唐山东部沉积盆地内存在1个剪切波低速层。精定位分析结果表明,增加浅层速度模型有助于提高深度较小的地震定位精度;塌陷周边的低速区向下延伸近20 km,为地震多发区。 相似文献
96.
济南市章丘区垛庄镇北明村东崩塌地质灾害点高差大、跨度长、危害对象多,于2021年7月发生过几次局部崩塌,造成多户房屋受损,给人民的生命财产安全造成了严重的危害。本文从崩塌发育现状着手,通过现场调查、岩土工程钻探、坑探揭露等手段对崩塌体特征进行了分析,从边坡岩土体特征内在条件和降雨、植物根劈等外在因素综合研究了地质灾害形成机理。按照Bishop法圆弧稳定分析,计算边坡稳定系数Fs=0.998<1.0,边坡属欠稳定状态。探讨了避让搬迁、工程治理、群测群防、自动监测等几种地质灾害防治对策,以期为类似地质灾害的治理提供参考。 相似文献
97.
G. Herrera R. Toms J.M. Lopez-Sanchez J. Delgado J.J. Mallorqui S. Duque J. Mulas 《Engineering Geology》2007,90(3-4):148-159
The town of La Union (SE, Spain) is located within a metal mining area that has been exploited since the Roman period. This historic exploitation has left behind a high concentration of abandoned underground mining galleries. Currently, an industrial area is subsiding due to the collapse of one of these galleries in May 1998. In this paper, an advanced Differential Interferometry SAR (DInSAR) method called the Coherent Pixels Technique (CPT) has been used to study the subsidence phenomena for two time intervals, from January 1998 to December 2000, and from March 2003 to December 2004. DInSAR-derived deformation maps have enabled the detection and monitoring of different deformation processes that affect several locations within the study area. By comparing these results with the underground mining galleries map, a clear relationship between their presence and the subsidence has been proved. Deformation values retrieved with DInSAR between April 2003 and December 2004 have been compared with the topographical leveling network measurements performed in this same period, providing an absolute average difference of 0.7 cm with a standard deviation of 0.5 cm. Results obtained in the city of La Union have shown that the advanced DInSAR technique is able to provide very useful spatial and temporal deformation data for the measurement of small scale subsidence throughout short time periods. This technique has enabled the temporal evolution of the phenomena in the city of La Unión to be studied and understanding of subsidence to be expanded beyond the limits of a deployed topographical control network, in a more cost effective way than classical methods. 相似文献
98.
99.
崩塌与滑坡是耒阳市的主要地质灾害类型,通过对其发育特征及成生因素的初步探讨,分析并提出了该市崩塌与滑坡的差异性和共同点,针对具体事例论证了以暴雨为主要诱发因素导致的崩滑现象具有明显的阶段性和复活性,提出了今后有效治理崩滑的防治措施和建议,可供地方防灾减灾借鉴参考。 相似文献
100.
城市地下工程中的环境岩土工程问题 总被引:8,自引:0,他引:8
近年来, 随着城市人口的急剧增长, 交通与住房拥挤状况日趋突出, 在我国一些大中城市中, 道路交通隧道、地铁工程、地下商城等地下工程建设项目在逐年增多。由于城市工程环境特殊性和地下工程的特点, 在其施工过程中经常出现基坑失稳 (明挖 )、地面沉降、岩溶塌陷、洞室失稳、巷道突水等多种环境岩土工程问题, 不仅严重影响地下工程建设和周围建筑物环境安全, 而且给国家造成重大经济损失。这一问题已引起岩土工程领域很许多专家的关注, 并成为该领域的研究热点。本文结合南京市区地下工程建设的实际情况, 探讨城市地下工程环境岩土工程问题的特点和形成机理, 并提出解决地下工程环境岩土工程问题的方法和建议。 相似文献