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安徽怀宁章岭滑坡发育于高丘土质斜坡上,滑坡体岩性为碎石土,滑坡面主要为碎石土与黏土交界面,滑坡平面呈舌形,剖面呈弧形,后缘和侧翼发生了两次显著的拉裂下挫,前缘陡坎崩塌,前缘地面发生多处推挤剪出变形,是典型的牵引式土质滑坡。研究表明：该滑坡形成的内因主要是复杂的地形地貌、地层结构不良特性以及地下水动态剧烈变化;外因是人工切坡,诱发因素为持续降雨和暴雨。该滑坡危害方式是推倒瞭望塔、覆盖防汛通道阻断交通、破坏路面和挡土墙,并危及行人,危害性中等。目前滑坡体活动性极强,滑坡地质灾害风险高,建议采用裂缝填埋、抗滑桩支挡、削坡整形、截排水、生态修复和滑坡监测等工程措施进行治理。 相似文献
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北山古寺滑坡位于北山古寺旅游景区山坡处,第四系上更新统坡积残积土层中.通过对滑坡的发育特征及周边工程地质环境的调查,认为滑坡区的构造条件、地貌特征、地层岩性、水文地质条件是造成滑坡的内在原因,而暴雨与旅游开发则是滑坡发生的诱发因素.经评价,该滑坡体稳定性差（稳定系数小于1.35）,故建议采取以滑坡后缘锚索,前缘和中段设置挡土墙,中轴设降水盲沟,周边设排水沟等工程措施为主,结合植树造林、工程管理等为辅的综合防治措施. 相似文献
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李松营 《中国地质灾害与防治学报》2011,22(1):32-36
描述了铁生沟矿邻区滑坡山体的地形、岩性、滑动规律和特点,圈出了滑坡体及其可能的致灾范围。从滑体岩性、滑面、大气降水和人工活动等方面分析了滑坡活动原因,指出山体滑动是内外因综合作用的结果,第四系松散堆积物及其中下段的粘土滑面是内在原因,强降水和人工切坡是诱发因素。提出了挖砌截、排水沟,表层防渗处理,削坡减荷,埋置抗滑桩和注浆加固等相结合的综合防治措施。通过应用多手段进行综合治理,该滑坡山体可以得到彻底治理,并能够确保该矿生活区居住职工家属和矿井安全。 相似文献
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重庆忠县泔井滑坡物性特征及稳定性研究 总被引：1，自引：1，他引：0
通过对泔井滑坡的工程（以钻探方法为主）地质勘察评价,对滑坡的物理力学性质及其稳定性有了较为系统的认识：①滑坡体的物质成分主要为粉质粘土加碎、块石;②潜在滑移带均由粉质粘土组成;③对滑坡体和滑移带土的物理力学性质用表格形式进行阐述;④对滑坡体发生滑动的影响因素进行了系统分析;⑤采用传递系数法对滑坡体分多种工况条件进行了稳定性系数和推力计算;⑥结论：在天然状态下,滑坡的稳定系数为1.35,处于稳定状态;在暴雨状态下,加之库区水位达175m时稳定系数为1.01~1.05,滑坡处于欠稳定状态;而在175m回落至145m的过程中加暴雨及地震作用下,稳定系数为0.97~0.98,这时的滑坡处于不稳定状态。 相似文献
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南海市尖峰顶西坡山体发生中型滑坡,经重新直设排 水管和填土后仍然活动。通过地形测绘、路线调查、槽井探和钻探工程进行综合勘察,查明该处发育的是一要素较齐全的、发生于粘性土中的牵引式滑坡,形成的原因主要是岩土层中存在软弱带和起量的地表水渗入。通过稳定性分析、验算后认为,该滑坡处于不稳定状态,滑坡推力以原公路挡土墙附近处为最大。提出了采用抗滑桩和截、排水工程进行治理的方案。 相似文献
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西部大开发工程基建中经常遇到滑坡体探测问题,由于滑坡体滑床滑动面与第四系覆盖的电性差异小,常规电磁法分辨困难。为此,提出利用等值反磁通瞬变电磁法(OCTEM)探测滑坡堆积体、反向追踪山体错动面的方案,构建滑坡堆积体地电结构模型,通过正演计算研究滑坡堆积体的瞬变电磁响应规律,从理论上分析了不同厚度的滑坡堆积体瞬变电磁响应规律以及在不同覆盖厚度下的瞬变电磁响应规律;对已知滑坡体的探测试验表明滑坡问题上首先分析堆积体观点的正确性,同时表明OCTEM用于山区滑坡堆积体的探测有效性。 相似文献
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本文通过几个在灰色软粘土层中开挖施工造成边坡失稳、产生滑坡的实例,对形成滑坡的因素、滑坡特征、滑动土体的稳定计算、滑坡体的善后勘探与处理等方面进行了初步分析探讨。对工程勘测、设计、施工具有一定参考价值。 相似文献
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邹鲁德 《地质灾害与环境保护》2011,22(1):80-83,97
"钻孔注浆+预应力锚索"工艺被应用在了迪庆变电站滑坡山体的工程治理中.本文在分析滑坡体地层结构、岩性和地形特征的基础上,介绍工程设计、工艺和施工方案.工程效果表明,在破碎岩土区,"钻孔注浆+预应力锚索"工艺治理滑坡效果显著. 相似文献
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Guboglo M. N. 《GeoJournal》1980,4(1):53-58
International unity is becoming ever stronger in this country owing to an increasing similarity in the development of the cultural environment. This comprises the provision of all the country's republics with a sufficient number of schools, theatres, and other institutions and cultural information media in accordance with the needs of the population. An important part is played by the rise in ‘the general educational level, as well as the level of professional qualifications and skills. Among all the Soviet nations and nationalities, this rise being more rapid among formerly backward peoples. Prominent among the factors of internationalization is the progressive development of the nationalities’ cultural resources, while professional culture is being increasingly brought within the reach of the masses.The implementation of the nationalities policy promotes the all-round development of all Soviet nations and nationalities, their drawing together, the upsurge of the individual capabilities of every Soviet citizen. 相似文献
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Deviation of the major axis of the inertia ellipsoid of the Moon from the direction toward the Earth
B. P. Kondratyev 《Astronomy Reports》2017,61(8):709-714
It is known from observations that the center of mass of the Moon does not coincide with the geometric center of its figure, and the line connecting these two centers is not aligned with the direction toward the center of the Earth, instead deviating toward the Southeast. This stationary deviation of the axis of the inertia ellipsoid of the Moon to the South of the direction toward the Earth is analyzed. A system of five linear differential equations describing the physical libration of the Moon in latitude is considered, and these equations are derived using a new vector method taking into account perturbations from the Earth and partly from the Sun. The characteristic equation of this system is obtained, and all five oscillation frequencies are found. Special attention is paid to the fifth (zero) frequency, for which the solution of the latitude libration equations are stationary and represents a previously unknown additional motion of the rotational axis of theMoon in a cone with a small opening angle. In contrast to the astronomical precession of the Earth, the rotation of the angular-velocity vector is in the positive direction (counter-clockwise), with the period T 3 = 27.32 days. On this basis, this phenomenon has been named “quasi-precession.” This quasi-precession leads to a stationary inclination of the major axis of the inertia ellipsoid of theMoon to the South (for an observer on Earth), making it possible to explain one component of the observed deviation of the center of mass of the Moon from the direction toward the Earth. The opening angle of the quasiprecession cone is approximately 0.834″. 相似文献
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Chronological analyses of correlations between certain global repeating events (mass extinctions of marine organisms, meteorite impacts, and flashes in the frequency of geomagnetic reversals) during the Phanerozoic Eon and the motion of the solar system in the Galaxy are presented for five rotationally symmetrical models for the regular Galactic gravitational field. Thirteen of sixteen mass-extinction events can be described by a repetition interval of 183±3 million years. This is in agreement with the anomalistic period (interval between two subsequent passages of the Sun through the apocenter of its Galactic orbit) in the model of Allen and Martos. The positions of the minima and maxima in Gaussian functions approximating the frequency distribution for geomagnetic reversals also agree with the times of passage of the Sun through the apocenter and pericenter, respectively, of its Galactic orbit in this model. The maximum in the distribution of the deviations of the dates of mass extinctions from the nearest dates of impacts of large, crater-forming bodies is close to zero, providing evidence that many such events are correlated. As a rule, extinctions follow impact events. The impacts of large bodies have occurred most often when the solar system passes through the Galactic plane, while mass extinctions occur more often at some distance from the Galactic plane (about 40 pc). As a rule, intervals of increases in the frequency of geomagnetic reversals coincide with dates of impacts of large bodies. At the same time, these intervals do not show a clear correlation with the dates of mass extinctions. The intensity of mass extinctions, like the energy released by impacts, is consistently higher in periods when the Sun is moving from the apocenter toward the pericenter of its orbit, than when it is moving from the pericenter toward the apocenter. Thus, there is evidence for a variety of relationships between repeating global events in the Phanerozoic and the motion of the Sun in the Galaxy. Long-period variations in the frequency of geomagnetic reversals are correlated with the orbital motion of the Sun, and increases in the frequency of geomagnetic reversals are correlated with impacts. Mass extinctions are correlated with the impacts of large bodies, whose motions may have been perturbed by clouds of interstellar material concentrated toward the Galactic plane and by the shock front associated with the Perseus spiral arm, through which the solar system passes. The velocity of the Sun relative to the spiral pattern is estimated. 相似文献
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摩擦桩基桩土间极限摩阻力取值问题探讨 总被引：1，自引：0，他引：1
通过对广珠东线高速公路横沥大桥的试桩及土体的工程地质条件分析,总结出影响摩擦桩基桩土间极限摩阻力取值的一般问题以及解决问题的方法和措施。 相似文献
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位于华北和扬子两板块碰撞带中的苏鲁榴辉岩形成的温压条件不但是超高压，而且是高温。榴辉岩的PTt轨迹表明其为陆-陆磁撞俯冲带的产物。榴辉岩的区域性围岩花岗质片麻岩为新元古代同碰撞期花岗岩，榴辉岩及其他直接围岩皆呈包体存在于其中，并见新元古代花岗岩呈脉状侵入榴辉岩包体中。区域性围岩新元古代花岗岩的锆石中发现有柯石英、绿辉石等包裹体，表明新元古代花岗岩的组成物质也经受过超高压变质作用，且榴辉岩与围岩新元古代花岗岩的锆石U-Pb体系同位素年龄基本相同。但新元古代花岗岩所记录的变质作用和变形作用期次（或阶段）却少于榴辉岩。椐上述可得如下推断：超高压榴辉岩与新元古代花岗岩岩浆是同时在碰撞带底部（俯冲板块前部）形成的；榴辉岩的第一折返阶段是由新元古代花岗岩岩浆携带上升的，其第二折返阶段是和新元古代花岗岩一起由逆冲及区域性隆起而上升，遭受剥蚀。 相似文献
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某高速公路下伏煤矿采空区稳定性分析 总被引：10，自引：0，他引：10
在论述某高速公路下伏砦脖煤矿采空区地质、采矿和工程地质特征的基础上, 进行了稳定性数值模拟分析, 定性与定量地分析与评价了该煤矿采空区的地表变形特征及稳定性。研究结果表明: 该煤矿采空区的变形尚未完成, 对拟建的高速公路将产生很大的危害, 必须采取相应的工程治理措施。 相似文献
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The Importance of the Precipitation and the Susceptibility of the Slopes for the Triggering of Landslides Along the Roads 总被引：3，自引：1，他引：2
Clemente Irigaray Francisco Lamas Rachid El Hamdouni Tomás Fernández José Chacón 《Natural Hazards》2000,21(1):65-81
In order to characterise the influence of the heavyrains on the observed landslides during the 1996–1997hydrological cycle, rainfall records for the last 100years are analysed from 104 stations in easternAndalusia. Regarding the amounts of rain recordedbetween October 1996 and March 1997 in the 104stations studied, 31 presented new all-time records;15 presented values that were 80–100% of thepre-1995 record; 49 stations, 80–50%; and 9stations, < 50%. A map has been devised of thesusceptibility of the materials through which thesouth-eastern Andalusian road network crosses,together with an inventory of the damage caused byinstability phenomena on banks and cuttings of theroad network during the winter of 1996–1997. Therelationships between the rainfall during the studyperiod, the damage caused to the road network and thesusceptibility of the materials affected are analysed.The results indicate that there is a clearcorrespondence between the rainfall recorded and thesusceptibility of the materials with the inventorieddamage. It is concluded that the widespread seriousdamage caused in early 1997 to the roads andsurrounding areas in the Alpujarra region and thecoast of the Province of Granada was mainly caused bythe extraordinarily heavy rains. However, considerablyless damage was observed where the susceptibility ofthe terrain is low, thus highlighting the extremeusefulness of terrain-susceptibility maps for riskprevention and territorial planning. 相似文献
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The structure of the eastern Pyrenees consists mainly of south-directed thrusts involving basement and cover rocks. An antiformal stack developed by the piling up of basement thrust sheets which outcrop in the Axial zone. These structures account for a thin-skinned thrust model rather than a vertical fault model in which the Axial zone would be essentially autochthonous, and the North-Pyrenean fault the axial plane of a fan thrust system. New data from the Eastern Pyrenees and the thin-skinned model suggest that(1) the structure east of the Pedraforca nappe is similar to that of the Central Pyrenees; (2) the cover rocks of the South-Pyrenean units and of the Axial zone-after restoration—built up a northwards-thickening prism consistent with the existence of a unique Pyrenean sedimentary basin during Mesozoic time; (3) the Axial zone is only a complex antiformal stack developed as a part of South-Pyrenean system related to the Paleogene thrusting-tectonics. The Axial zone palaeogeographic area had no special meaning during Mesozoic time. 相似文献