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51.
江西省定南县滑坡形成条件分析 总被引:1,自引:0,他引:1
边晓庚 《中国地质灾害与防治学报》2005,16(1):57-60
江西省定南县滑坡较为发育,1990~2002年,全县共发生滑坡283处,其规模一般较小,但造成的损失大。滑坡均由降雨诱发,4~6月份降雨量较大、多暴雨,该段时间滑坡较为多发;除此以外,影响滑坡形成的因素还有地形地貌、岩土类型、地质构造、岩土结构类型、人工切坡等。江西省定南县主要为中低山与丘陵地形,山坡坡度较大;岩土类型主要为岩浆岩、变质岩,岩石较为破碎,残坡积层与强风化层厚度大;断裂构造较为发育;居民大量挖山建房,形成大量的人工高陡边坡;这些因素为滑坡的形成提供了必要条件。 相似文献
52.
单一滑面边坡的非稳定蠕变模型分析 总被引:3,自引:0,他引:3
对单一滑面边坡的非稳定蠕变分析是边坡稳定性研究的基础。文中对岩质边坡单一滑面的流变变形机制进行了分析,提出了一种能较好反映这一变形机制的非稳定蠕变模型。特别是描述单一滑面边坡的非稳定蠕变破坏阶段,并对其稳定性进行了讨论。结合一些工程实例进行了对比验证,为滑坡灾害的预测和防治提供依据。 相似文献
53.
构造煤与原生结构煤的显微傅立叶红外光谱特征对比研究 总被引:3,自引:0,他引:3
通过对平顶山、郑州和南票三大矿区石炭二叠纪含煤岩系中高煤级烟煤和无烟煤的显微傅立叶红外光谱分析,探讨了原生结构煤与构造煤的有机大分子结构演化特征及其影响因素。结果表明,构造应力有利于煤中氢发生化学环境转移,使脂肪烃含量相对减少、稳定的芳香烃含量相对增加,促进煤大分子结构缩合度和有序度增加。 相似文献
54.
55.
青藏公路路基变形分析 总被引:29,自引:8,他引:29
为研究青藏公路多年冻土人为上限在退化过程中对路基变形产生的影响过程和程度, 在唐古拉山以南选择了3处具有代表性的路面进行了为期2 a的路面变形观测. 资料表明, 在多年冻土人为上限退化过程中随着公路路基结构、冻土类型的不同, 路基变形从冻胀和融沉过程、冻胀量和融沉量、发生的时间都有很大的不同. 在高含冰量多年冻土区采用半挖半填结构产生的路基变形最为剧烈, 在含冰量相对少且采用较高路堤结构的地段路基变形过程相对平缓. 同时结合探地雷达的勘察结果对路基下的融化区、多年冻土区的内部结构进行了分析. 结果显示,多年冻土人为上限的下移、地下冰的融化会在多年冻土人为上限以上的地质体中导致较强烈的层间错动和扰动. 相似文献
56.
57.
The deformation pattern and the dynamics of the southern sector of the Aeolian archipelago are investigated. A study on the ground deformation, measured over the last 20 years in the trilateration geodetic network between the islands of Vulcano and Lipari, has been conducted. Analysis of the relative displacements and the uniform strain tensor parameters, as well as the comparison between areal dilatation and the vertical variations deduced by precise levelling, allow distinguishing different phases associated both with the regional dynamics and the local volcanic context of the area. These phases, however, appear to be closely interrelated. The analysis of the deformation pattern allows to constrain the predominance of a roughly E–W trending extension and a N–S contraction at a regional scale. This regime is consistent with right-lateral movements along a NW–SE striking fault system. 相似文献
58.
The lack of earthquake-induced liquefaction features in Late Wisconsin and Holocene sediments in Genesee, Wyoming, and Allegany Counties suggests that the Clarendon–Linden fault system (CLF) did not generate large, moment magnitude, M≥6 earthquakes during the past 12,000 years. Given that it was the likely source of the 1929 M 4.9 Attica earthquake, however, the Clarenden–Linden fault system probably is capable of producing future M5 events. During this study, we reviewed newspaper accounts of the 1929 Attica earthquake, searched for earthquake-induced liquefaction features in sand and gravel pits and along tens of kilometers of river cutbanks, evaluated numerous soft-sediment deformation structures, compiled geotechnical data and performed liquefaction potential analysis of saturated sandy sediments. We found that the 1929 M 4.9 Attica earthquake probably did not induce liquefaction in its epicentral area and may have been generated by the western branch of the Clarendon–Linden fault system. Most soft-sediment deformation structures found during reconnaissance did not resemble earthquake-induced liquefaction features, and even the few that did could be attributed to non-seismic processes. Our analysis suggests that the magnitude threshold for liquefaction is between M 5.2 and 6, that a large (M≥6) earthquake would liquefy sediments at many sites in the area, and that a moderate earthquake (M 5–5.9) would liquefy sediments at some sites but perhaps not at enough sites to have been found during reconnaissance. We conclude that the Clarendon–Linden fault system could have produced small and moderate earthquakes, but probably not large events, during the Late Wisconsin and Holocene. 相似文献
59.
Static deformation of two monoclinic elastic half-spaces in welded contact due to a long inclined strike-slip fault situated
in one of the half-spaces is studied analytically and numerically. Closed-form algebraic expressions for the displacement
at any point of the medium are obtained. The variation of the displacement at the interface with the horizontal distance from
the fault is studied. The effect of anisotropy on the displacement field is examined. It is found that while the anisotropy
of the source half-space has a significant effect on the displacement at the interface, the anisotropy of the other half-space
has only a marginal effect. 相似文献
60.