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通过南平某商住小区高边坡岩土工程勘察工程实例,分析研究其边坡稳定性,认为该边坡土体整体超过临界稳定状态而处于不稳定状态,边坡岩体当存在外倾结构面时处于不稳定状态,特别是在连续降雨或暴雨条件下,边坡可能失稳。根据边坡特征和不同工程情况,提出了边坡的支护结构类型和采取削坡减载、排水及坡面防护的综合治理方案,治理效果良好。 相似文献
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以兰州南绕城高速公路已加固典型路堑高边坡为研究对象,利用AutoCAD及ANSYS软件建立所选典型边坡的三维数值模型,在此基础上运用有限差分软件FLAC3D对其在地震工况下的稳定性进行科学评价,目的是为黄土类高边坡工程防护及安全设计提供参考。得出的结论为:当水平向地震加速度为0.1g和0.2g时边坡处于稳定状态,水平向地震加速度为0.3g时边坡处于基本稳定状态,水平向地震加速度为0.4g时边坡处于不稳定状态。研究表明,格构锚杆支护承受了大量拉张应力及剪应变增量等,效果显著,对边坡稳定性发挥了重要作用。因该公路建设区抗震设防烈度为8度,地震加速度设计为0.2g,所以地震工况下的所选格构支护边坡处于稳定(稳定系数为1.15)状态,能够满足规范要求。 相似文献
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恶滩水电站4#机基础开挖形成40m左右的高边坡,开挖过程中,边坡上部的纵向混凝土围堰不断出现横向和纵向裂缝,监测资料表明其有明显的水平和垂直位移。本文采用弹塑性有限差分数值模拟方法,对基坑开挖过程中混凝土围堰和4#机高边坡内的应力应变状态进行分析,同时结合地质资料和现场变形观测资料分析,多角度分析了边坡的变形机制。结果表明,河水位升降变化、高边坡施工开挖、F711断层揭露以及复杂的地质条件等是变形的主要影响因素,同时采用二维塑性力学上限解方法对该高边坡的稳定性进行分析,并提出采用以预应力锚索为主的边坡加固方案。监测结果表明,加固后边坡处于稳定状态。 相似文献
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阐述了高边坡发育的地质环境,描述了高边坡变形的主要特征,这些特征主要表现为边坡上部的蠕滑拉裂及中部的倾倒变形等,根据这些特征,分析了高边坡变形破坏的潜在模式,并对潜在滑面的参数进行了试验分析及取值研究,最后结合高边坡可能遇到的各种工况条件对其稳定性进行了估算,结果表明,该边坡在天然条件及降雨条件下处于稳定状态,地震务件下处于极限平衡状态,而在泄流雨雾及降雨叠加地震条件下均将失稳破坏. 相似文献
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高陡碎裂结构千枚岩路堑边坡稳定性分析与支护设计 总被引:1,自引:1,他引:0
为了确保高速公路的安全,正确进行高边坡稳定性分析和采取经济有效的加固防护措施是高边坡设计的两个重要方面。本文以皖南山区黄山至塔岭(皖赣界)和小贺至桃林(皖浙界)高速公路ZK9+385~ZK9+425处高边坡为例,归纳出边坡所处典型地质地貌特征和路堑边坡的主要工程地质条件,总结边坡破坏主要形式,分析边坡破坏机理,并采取定量评价方法对边坡的稳定性进行合理评价,据此提出合理、有效、经济的支护设计方案,最后根据监测数据来进行验证。 相似文献
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依托元江至蔓耗高速公路(红河段)项目,对红河县境内具有代表性的深挖路堑高边坡病害产生的原因进行分析,通过对路堑高边坡工点现场调研及理论分析,得出了路堑高边坡破坏的原因及影响因素,并对路堑高边坡病害进行有效的防护措施,且取得了很好的防护效果。其工程经验可对类似路堑高边坡破坏分析及防护提供参考价值。 相似文献
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本文分析了锚喷加固技术在边坡加固中的适用性,根据地质情况进行了边坡稳定性分析计算,介绍了锚喷加固设计及施工工艺,指出锚喷加固技术用于路堑高边坡的加固防护有较好的社会效益及经济效益。 相似文献
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现有公路(铁路)工程中的高陡岩质边坡,特别是风化作用强烈地区的岩质边坡,浅表层岩体多呈碎裂状。采用传统SNS主动防护网加固后,仍经常产生局部失稳、掉块等现象,部分甚至引起整体失稳。因此,针对破碎岩质边坡的加固防护迫切需要进行结构及其设计方法改进。本文提出一种锚墩式主动防护网新型组合结构及其受力计算和设计方法,可有效防止碎裂岩质边坡坡面破坏,同时保证边坡整体稳定。工程应用表明,该组合防护结构具有良好的破碎岩质边坡加固效果,值得在工程建设中推广应用。 相似文献
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某跨海大桥主塔位工程边坡稳定性研究 总被引:5,自引:0,他引:5
某跨海大桥为一悬索桥 ,其主塔位于海中的岛礁上。因岛礁山体略显单薄 ,受数条断层及其他构造裂隙的影响 ,整体完整性较差。本文在大量现场地质资料调查基础上 ,系统结合上部结构荷载、风荷载 ,对工程边坡稳定性进行了分析研究 ,结果表明工程边坡整体稳定 ,但浅表部存在不稳定块体 ,并提出浅表部边坡相应的加固建议措施 相似文献
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In the present study, cut slope stability assessment along ghat road section of Kolli hills was carried out by using various geotechnical parameters of rock and soil slope sections and structural kinematics of major discontinuities is presented. The rock slope (RS) stability assessment was carried out using Rock Mass Rating basic (RMRbasic) and Slope Mass Rating (SMR) classification systems. The type of failure and their Factor of Safety (FOS) for individual RS was calculated using Hoek and Bray method. In the case of soil slopes (SS), the FOS was calculated using Circular Failure Chart (CFC) and Limit Equilibrium (LE) methods. The input data for the slope stability analyses were collected through extensive field work followed by stereonet plotting and laboratory test. There are six rock slope sections, and five soil slope sections were taken into consideration for the cut slope stability analyses. The area depicts class II (RS-1, 2, & 6) and class III (RS-3, 4, & 5) of RMR classes. The SMR result depicts for RS-1, RS-2, and RS-6 are 64.40, 60.02, and 60.70, respectively, and falls in class II stable condition. The SMR values of RS-3 and RS-5 were 44.33 and 57, respectively, and come under the class III partially stable condition. The RS-4 with SMR value of 17.33 falls under the class I completely unstable condition. The FOS of planar failure case indicates that RS-3 (FOS = 0.22) is more unstable, while all other sections are having greater than 1 FOS. The calculated FOS values using CFC method reveals that the FOS is very close to 1 for all the SS sections that fall under completely saturated condition which indicates that these slope sections may fail during heavy rainfall. In LE method, the sections SS-3 and SS-4 are unsafe under partially and completely saturated (natural slope) condition. In average slope condition, all the SS sections are unsafe under partially or completely saturated conditions. The facets 2, 3, 4, and 5 required mitigation measures, to improve the stability of slopes. Site-specific mitigation measures were suggested for partially or completely unstable rock and soil cut slopes. 相似文献
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基于抛物线型D-P准则的岩质边坡稳定性分析 总被引:3,自引:0,他引:3
岩质边坡内通常会存在部分拉剪屈服区,因此,在岩质边坡的稳定性分析中采用能够同时考虑拉剪屈服和压剪屈服的H-B准则相较M-C准则来说更为合适。推导了基于H-B准则的抛物线型D-P准则,克服了H-B准则在数值计算中的困难。针对基于抛物线型D-P准则的有限元强度折减法,证明了折减抛物线型D-P准则材料参数的合理性。结合上述研究成果,分析了茨哈峡水电站右岸泄水边坡在天然状况下和泄水雾化状况下的稳定安全度。计算结果表明,该边坡在天然状况下是稳定的,但在泄水雾化状况下将会发生失稳。因此,需对该边坡采取工程处理措施,提高其稳定安全度,以防泄洪雾化失稳。 相似文献
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Rheological Characteristics of Weak Rock Mass and Effects on the Long-Term Stability of Slopes 总被引:2,自引:0,他引:2
Tianhong Yang Tao Xu Hongyuan Liu Chunming Zhang Shanyong Wang Yongqin Rui Li Shen 《Rock Mechanics and Rock Engineering》2014,47(6):2253-2263
The creep deformation behavior of the northern slope of an open-pit mine is introduced. Direct shear creep tests are then conducted for the samples taken from the northern slope to study the rheological characteristics of the rock mass. The experimental results are analyzed afterwards using an empirical method to develop a rheological model for the rock mass. The proposed rheological model is finally applied to understand the creep behavior of the northern slope, predict the long-term stability, and guide appropriate measures to be taken at suitable times to increase the factor of safety to ensure stability. Through this study, a failure criterion is proposed to predict the long-term stability of the slope based on the rheological characteristics of the rock mass and a critical deformation rate is adopted to determine when appropriate measures should be taken to ensure slope stability. The method has been successfully applied for stability analysis and engineering management of the toppling and slippage of the northern slope of the open-pit mine. This success in application indicates that it is theoretically accurate, practically feasible, and highly cost-effective. 相似文献
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基于极限分析上限法理论,运用体积力增量法,考虑单层滑动面极限分析模型的缺陷,建立考虑含结构面的多岩层错动的任意块体模型,利用岩块体在外荷载作用下达到极限破坏时,外荷载做的功与岩体消耗的功相等为基础建立等式方程,由此推导得到此类边坡稳定系数的计算公式。在分析典型边坡算例的基础上,对比离散元数值模拟结果,验证了该方法的可行性和适用性。对云南省普宣高速公路某顺层岩质边坡进行计算,其稳定系数接近离散元数值模拟结果,数值稍有偏大,边坡稳定。其研究结果为此类边坡稳定性评价提供了一种新的计算方法。 相似文献
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公路是国家经济发展的主要载体,公路沿线的边坡稳定性评价及治理工作会成为今后很长一段时间的重点工作。本文以北京市房山区G108国道K3+500~K4+720路段6处危岩治理为工程背景,开展岩质边坡稳定性评价方法及治理措施研究。本文研究的重点是山体边坡是否稳定,同时选取最为有效的治理方案,为类似治理项目提供借鉴。 相似文献