边坡岩体质量分类体系的CSMR法及应用   总被引：7，自引：0，他引：7  

李胜伟  李天斌  王兰生 《地质灾害与环境保护》2001,12(2):69-72

详细、系统地介绍边坡岩体质量评分类的CSMR法，并结合西南某水电站进水口边坡工程的实例，讨论运用CSMR系统进行边坡岩体质量分类的改进意见。实践证明，此法具有简便性和可行性，值得进一步推广。结合工程实践，并指出此法的不足之处。  相似文献   

龙塘山2号大桥岸坡破坏模式的离散元模拟     

詹志峰  谢强  赵文 《地质灾害与环境保护》2001,12(4):67-70,79

以龙塘山 2号大桥为工程背景 ,在综合考虑桥基岸坡的工程地质条件尤其是岩体结构的基础上 ,建立了数值分析模型 ,采用离散元法对该桥 10 #墩所处岸坡的破坏模式进行了模拟。模拟结果表明 :( 1)龙塘山 2号大桥 10 #墩所处岸坡基本稳定 ;( 2 )施工时 ,应对既有公路上方岸坡坡顶及坡面可能崩滑岩块进行预清除与加固 ;( 3)根据岸坡破坏趋势可得其稳定坡角为 5 0°  相似文献   

柔索桩护坡技术     

蒋天涛 《岩土工程技术》2001,(1):1-7

柔索桩是一种新型的护坡桩。在基坑外围将钢筋、铜棒或钢管等柔索材料按网格状平面布置，竖向植入土体内，周围灌浆或灌砂与土体紧密结合，桩端进入基坑底面标高下一定深度或计算的滑裂面下的稳固土体内，桩顶用混凝土梁或锚板将成排的桩群联成整体。这种上下紧箍的钢筋、铜棒或钢管等柔索材料与周围土体形成一个良好的三维高强复合土体。  相似文献   

Engineering-Geological Problems in the Moravian Karst,Czech Republic     

Milena AMALIKOVA 《《地质学报》英文版》2001,75(3):303-307

The Moravian karst belongs to one of the famous karst regions in Central Europe. It is situated in Moravia in the eastern part of the Czech Republic. According to the geology it is of Devonian age and the main rocks are of different types of limestones. The process of karstification is still active. They are many caves with rich stalagmites and stalactites and the Macocha abyss, the depth of which is 138.5 m. The underground Punkva River flows through the main part of the karst, forming beautiful underground lakes. Typical karst phenomena, such as sinkholes and deep canyons, may be observed on the surface of the terrain. Because of the karstification, water erosion and frost weathering, many steep unstable slopes and walls originated. To solve the stability from a geotechnical point of view is not easy. This requests a special engineering-geological knowledge and experience.  相似文献   

Kinematic and Block Theory Analyses for Shiplock Slopes of the Three Gorges Dam Site in China     

Jeongi-Gi Um  Pinnaduwa H. S. W. Kulatilake 《Geotechnical and Geological Engineering》2001,19(1):21-42

The granitic rock mass that exists in the shiplock region of the Three Gorges dam site contains a number of major discontinuities and about four sets of minor discontinuities. One hundred and thirty three major discontinuities have been mapped around the shiplock covering an area of 1740×600 m. These major discontinuities were used to perform rock slope kinematic and block theory analyses. Kinematic analyses were performed under the following two cases: (1) assuming all the mapped discontinuities cross the shiplock; (2) using only discontinuities that actually intersect the shiplock. Under case (1) and case (2) the shiplock faces in the proposed permanent shiplock region in fresh rock were found to be stable up to a cut slope of about 45° and 58°, respectively. Block theory was applied to identify different block types that exist on the shiplock faces and to estimate the maximum safe slope angles on the shiplock faces. The orientations of the major discontinuities that actually intersect the shiplocks were considered in this analysis. The total length of the shiplock (1750 m) was divided into 50 m segments. From the stereo-plots, the key blocks (Type I) and/or potential key blocks (Type II) were found for only five segments of the shiplock slopes. It was found that the dip of the cut slope should be less than about 60° to avoid creation of a key block on the proposed shiplock slopes. However, it is important to keep in mind that these conclusions are based on the kinematic analyses performed using only the major discontinuities. Further kinematic as well as kinetic analyses are recommended incorporating minor discontinuities, water forces, earthquake forces etc. before making the final conclusions about the maximum safe slope angle for the shiplock region.  相似文献   

北大某工程基坑支护     

李钟 《水文地质工程地质》2001,28(2):《水文地质工程地质》-2001年28卷2期-61-62.7页-《水文地质工程地质》-2001年28卷2期-61-62.7页

本文根据工程实例了软弱地层的基坑边坡支护方法，防止周边建筑物沉降变形的控制措施，邻潮防渗技术及残留 滞水的处理方法。  相似文献   

三峡库区坡耕地退耕与粮食安全的空间分异   总被引：9，自引：3，他引：9  

冯仁国  王黎明  杨燕风  欧阳宏斌 《山地学报》2001,19(4):306-311

坡耕地退耕还林还草作为生态环境建设的一项重要措施，已在全国逐步开展。坡耕地退耕使耕地数量减少，并影响到退耕地区粮食产量减少，尤其在坡耕地分布集中、交通不便地区的尤为突出。本文利用GIS技术对三峡库区坡耕地空间分布进行了分析，探讨了三峡库区坡耕地退耕后粮食安全隐患产生的原因，初步揭示了粮食供需矛盾的空间差异，并结合交通便利状况，划分粮食安全区、警戒区，危机区等三种不同类型的区域。  相似文献   

长江上游紫色土坡耕地土壤侵蚀~(137)Cs示踪法研究   总被引：9，自引：1，他引：9  

文安邦  张信宝  王玉宽  张一云  徐家云  白立新 《山地学报》2001,(Z1)

运用1 37Cs示踪法对长江上游“长治”水土保持工程重点治理区的云贵高原区、川中丘陵区和三峡库区 8块紫色土坡耕地土壤侵蚀速率研究结果表明 ,影响紫色土坡耕地平均侵蚀速率的主要因子为坡度、坡长、降雨量和土壤粒度组成 ,四个研究区土壤平均侵蚀速率介于 75 8t km2 ·a- 1 ～ 985 4t km2 ·a- 1 ,计算值与长江上游类似地区径流试验场观测值基本一致。  相似文献   

陕西黄陵彬长矿区地质灾害的评价预测   总被引：4，自引：0，他引：4  

杨梅忠  李鹏  宋继华 《地质灾害与环境保护》2001,12(3):38-41

通过对黄陵彬长矿区地质灾害类型、现状与特点的分析研究，确立了矿区地面塌陷、斜坡变形等各类地质灾害评价预测的原则与模型，依据评价预测的计算与分析结果，将矿区划分为稳定区、次稳定区、危险区和极危险区，确定出12个灾害段。  相似文献   

312国道蓝小二级汽车专用公路K37+580-K37+654边坡治理工程设计与施工     

邓学军  蓝兰 《地质灾害与环境保护》2001,12(3):52-55

通过312国道蓝小二级汽车专用公路K37＋580－K37＋654段公路边坡的稳定性进行分析，提出了以预应力锚索支护为主的边坡治理方案，并对工程施工的有关技术要求进行了详细介绍。  相似文献