神经网络专家系统在大坝变形预测中的应用     

黄全义  张正禄 《测绘信息与工程》2001,(3):13-15

探讨了将人工神经网络专家系统用于大坝变形预测的方法，给出了系统功能结构框图，并对各模块的功能进行了分析。  相似文献   

长江三峡水电站坝址区断裂新活动年龄及地壳稳定性   总被引：13，自引：2，他引：13       下载免费PDF全文

李兴唐 《地质科学》1991,(2):111-119

长江三峡水电工程坝址区断裂新活动年龄分为两类:(1)>220×10⁴a BP.和(2)(131-54)×10⁴aBP.。坝区15公里范围内不存在近代活动断裂。地震基本烈度为Ⅵ度。地壳稳定性等级属稳定区。  相似文献   

坝体渗流与边坡稳定性研究     

Xu Zhaoyi 《吉林大学学报(地球科学版)》1989,(2)

在有渗流坝体中,支持毛细水在垂向与横向上都传递静水压力;它与饱水带构成统一的渗流场,一起进行着横向渗流。因此,对坝体应力分布的研究要同时考虑孔隙水压力和渗流驱动力的作用。如将坝体两坡的静水压力(面力)转做渗流驱动力(体力)时,则其分布范围不仅包括浸润曲面以下的饱水带,而且也包括支持毛细水带;在任一点的作用方向与流向相同。横向渗流速度在垂向上呈不等值分布,存在高速带,故渗流驱动力的大小也不是均布的。  相似文献   

长江口北支综合治理刍议   总被引：2，自引：0，他引：2  

茅志昌  陆健健 《海洋湖沼通报》2001,(1):66-70

长江口北支治理方案归纳起来有三类：阻隔型，如建坝方案；开敞型，如近年提出的“南隧北桥”中的北桥方案；半开敞型，如坝部结合型方案。本文从盐沙倒灌、水利、交通、围垦、资源保护和生态环境诸方面综合考虑，认为坝闸方案较为合宜。北支有丰富的土地、水产和潮汐能资源，为求得较大的社会、经济、环境效益，对北支应实行综合开发利用的原则。  相似文献   

Analysis and evaluation on seepage stability of Hongxing reservoir dam , Heilongjiang     

YANG Zhishuang  LI Xiaole  ZHANG Qinqyu 《世界地质(英文版)》2009,12(4):230-235

Hongxing reservoir was constructed on the floodplain of Hulan River in Heilongjiang. The geological problem of the reservoir is the seepage of the dam base and its related seepage stability. The leakage of the reservoir is caused by the water head differences between the upstream and downstream of the dam. Severe seepage could decrease the engineering benefits of the reservoir. Moreover, infiltration function of water will influence the safety of the dam. Through the analysis on the granule constitute and the formation of the dam base, the types of the seepage failure apt to happen were defined and the anti-infiltration and the permissible depression ratio were determined. Using the numerical simulation software GMS, the two-dimension numerical modeling has been carried out to analyze the seepage field of the reservoir. Through the two conditions modeling with concrete impervious wall and no concrete impervious wall, the largest flow rate, single-wide seepage discharge and the max infiltration gradient of the dam base were calculated. According to the permeable depression ratio of the dam base, the seepage stability of Hongxing reservoir dam base was analyzed.  相似文献   

Numerical modeling of soil–structure interface of a concrete-faced rockfill dam     

Ga Zhang  Jian-Min Zhang 《Computers and Geotechnics》2009

Concrete-faced rockfill dams (CFRD) are widely used in large-scale hydraulic projects. The face slab, the key seepage-proof structure of great concern, has a strong interaction with the neighboring gravel cushion layer due to a significant difference in their stiffness. An elasto-plasticity damage interface element, a numerical format of the EPDI model, is described for numerical analysis of a CFRD that can trace the separation and re-contact between the face slab and the cushion layer at the interface. As verified by simulating slide block and direct shear interface tests, this element was confirmed to capture effectively the primary monotonic and cyclic behaviors of the interface. This element can easily be extended to the finite element method (FEM) programs that involve the Goodman interface element. The analysis of a typical CFRD showed that the interface model describes a significant effect on the stress response of the face slab under different conditions, including dam construction, water storage, and earthquake. Treatments of the cushion layer, such as an asphalt layer, changed the behavior of the interface between it and the face slab, which resulted in a significant effect on the stress response of the face slab. The top of the face slab exhibited a significant separation from the cushion layer during construction, induced mainly by construction of the neighboring dam body.  相似文献   

小湾水电站低高程坝基开挖卸荷松弛机理试验研究   总被引：1，自引：0，他引：1  

林锋  黄润秋  蔡国军 《工程地质学报》2009,17(5):606-611

小湾电站低高程坝基开挖过程中,表层岩体卸荷松弛强烈,主要形式有沿已有裂隙地错动、张开和扩展,及因新生破裂而松弛。后者主要包括:葱皮现象、板裂现象和岩爆现象。试验测试表明,开挖面附近微新岩石为坚硬极坚硬岩石,但其初始损伤明显,其损伤发展启动应力在5.2~12.4MPa之间,抗拉强度在3~6MPa之间,这是坝基表层岩体卸荷松弛强烈的物质基础;坝基面爆破开挖的应力集中和爆炸作用影响是坝基岩体卸荷松弛强烈的岩石力学环境条件。  相似文献   

泥石流拦挡坝优化设计   总被引：1，自引：0，他引：1  

李冠奇  魏鸿  谷明成  李朝安  陈宪麦 《地质灾害与环境保护》2009,20(2):29-32

拦挡坝设防高度决定着库容,因此确定合理的设防高度在拦挡坝的设计中极为重要。在坝址确定的情况下提高拦挡坝的设防高度可以加大库容,增强防治工程的抗灾能力,但其泄洪能力会受到影响,因此拦挡坝的库容与其泄洪能力是矛盾的。既有设计理论中泥石流峰值流量按照全流域面积汇水输沙总量计算,该理论认为每个拦挡坝的设计洪峰流量是相同的,而实质上对于流域面积大的泥石流沟,设置在上游、中游及下游的拦挡坝由于汇水面积的差异而导致泥石流峰值流量相差较大,本文作者提出了按有效汇流面积计算泥石流峰值流量的优化设计方法,用该方法设计的拦挡坝的溢流断面面积较小,从而达到提高设防高度,增大库容,提高拦挡坝的容灾能力。  相似文献   

寒区平原水库土坝护坡冻害防治技术   总被引：2，自引：0，他引：2  

那文杰  袁安丽 《岩土工程技术》2009,23(4):201-205

根据近年来冻土力学、冰工程学等研究成果,简述了寒区原水库土坝护坡构筑物冻害防治技术的主要内容,包括平原水库土坝护坡工程冻害破坏规律,给出了土坝护坡冻害防治措施、防冰措施、抗冻胀设计参数的确定、抗冰推护坡稳定计算等,可供工程设计人员参考。  相似文献   

小湾电站边坡卸荷三维有限元模拟   总被引：3，自引：0，他引：3  

李晓春  陈剑平 《吉林大学学报(地球科学版)》2005,35(2):195-200

应用3D-Sigma软件对小湾右岸边坡的河谷下切卸荷过程进行了三维有限元弹塑性模拟.通过缩小单元规模,对边坡坡面下180 m范围内的应力、位移情况进行了详细的模拟.模拟结果表明:由横河陡倾分布的坚硬岩层构成的边坡在河谷下切形成坡体卸荷的过程中,坡体内产生的拉应力区较小;坡内岩体变形和应力分布主要受软弱面分布、微地形、主压应力分异、剪应力集中影响;卸荷的影响深度约在坡面下120m左右及软弱面附近120 m范围内,这些区域是边坡支护设计的重点.  相似文献