Some applications of a backpropagation neural network in geo-engineering     

K.?NeaupaneEmail author  S.?Achet 《Environmental Geology》2004,45(4):567-575

A MATLAB based backpropagation neural network (BPNN) model has been developed. Two major geo-engineering applications, namely, earth slope movement and ground movement around tunnels, are identified. Data obtained from case studies are used to train and test the developed model and the ground movement is predicted with the help of input variables that have direct physical significance. A new approach is adopted by introducing an infiltration coefficient in the network architecture apart from antecedent rainfall, slope profile, groundwater level and strength parameters to predict the slope movement. The input variables for settlement around underground excavations are taken from literature. The neural network models demonstrate a promising result predicting fairly successfully the ground behavior in both cases. If input variables influencing output goals are clearly identified and if a decent number of quality data are available, backpropagation neural network can be successfully applied as mapping and prediction tools in geotechnical investigations.  相似文献   

漫湾电站移民安置地的土地覆盖遥感监测   总被引：1，自引：0，他引：1  

袁希平  何大明 《山地学报》2004,22(3):267-271

结合野外实地考察,应用1988、1996、2000年的TM数据,以漫湾电站建设中远迁移民安置地作为研究试验区,监测移民安置地试验区内相应时段的土地覆盖状况,分析因电站建设以来试验区的土地覆盖变化时空分异特性与生态环境状况。结果表明,试验区移民安置地的土地覆盖在结构上表现为以旱地及其他混合类型为主要优势,在时间动态方面,移民安置地的旱地及其他混合类型出现急剧增加,而灌木林地急剧减少。究其原因是受山区自然条件限制,而电站移民因生活与生产需要,大量开垦灌木林地进行农业开发利用活动所致。由此得出,对于电站建设所必然出现的山区远迁移民安置地建设,自然力和人为作用是导致当地生态环境正效应和负效应的根本驱动力,因此,对于电站建设中的山区移民安置点土地利用,必须坚持规划指导与管理,促进其走可持续发展之路。  相似文献   

Centrifuge modeling of load-deformation behavior of rocking shallow foundations   总被引：4，自引：0，他引：4  

Sivapalan Gajan  Bruce L. Kutter  Justin D. Phalen  Tara C. Hutchinson  Geoff R. Martin 《Soil Dynamics and Earthquake Engineering》2005,25(7-10):773-783

Shallow foundations supporting building structures might be loaded well into their nonlinear range during intense earthquake loading. The nonlinearity of the soil may act as an energy dissipation mechanism, potentially reducing shaking demands exerted on the building. This nonlinearity, however, may result in permanent deformations that also cause damage to the building. Five series of tests on a large centrifuge, including 40 models of shear wall footings, were performed to study the nonlinear load-deformation characteristics during cyclic and earthquake loading. Footing dimensions, depth of embedment, wall weight, initial static vertical factor of safety, soil density, and soil type (dry sand and saturated clay) were systematically varied. The moment capacity was not observed to degrade with cycling, but due to the deformed shape of the footing–soil interface and uplift associated with large rotations, stiffness degradation was observed. Permanent deformations beneath the footing continue to accumulate with the number of cycles of loading, though the rate of accumulation of settlement decreases as the footing embeds itself.  相似文献   

高层建筑施工中沉降观测的质量控制要点     

金建文  杨崇华 《现代测绘》2006,29(1):33-34,39

本文阐述了某高层建筑施工中沉降观测的具体做法,总结了技术要点,探讨沉降观测在高层建筑建设过程中的质量控制。  相似文献   

灰色系统预测模型在沉降监测中的应用     

兰孝奇  严红萍  刘精攀 《现代测绘》2006,29(1):24-26

在深入研究和分析灰色系统预测模型的基础上,用Matlab软件编写了灰色系统模型用于沉降监测数据处理的程序。通过对某建筑物沉降项目的数据处理,得出较高的预测精度,证明了灰色系统预测模型在沉降监测应用中的可行性和可靠性。  相似文献   

建筑工程沉降观测的探讨   总被引：1，自引：0，他引：1  

胡锦修  滕风 《现代测绘》2006,29(3):25-26,32

根据本地实际地质状况,阐述了沉降观测在建筑工程中的作用,进行沉降观测工作的基本要求以及沉降观测中遇到的常见问题和解决办法。  相似文献   

Impact of elevated ammonium on reproduction in two Hawaiian scleractinian corals with different life history patterns     

Cox EF  Ward S 《Marine pollution bulletin》2002,44(11):1230-1235

Elevated nutrients have the potential to disrupt reproduction in scleractinian corals, with consequent impacts on population dynamics. Reproduction in broadcast spawning (Montipora capitata) and brooding (Pocillopora damicornis) species was assessed following exposure to elevated ammonium in a microcosm experiment. Planulation in P. damicornis ceased following 4 months of ammonium exposure and did not recover until 3 months after termination of nutrient enrichment. Larval settlement and survivorship were not affected by ammonium enrichment. Few significant changes were found for reproductive parameters of M. capitata. There was a significant but small decrease in egg size (430 microm in control eggs to 408 microm in eggs from ammonium enrichment treatments), but no differences in total fecundity or fertilization success. This may be related to the presence of zooxanthellae in the eggs of M. capitata, in contrast to changes in reproduction previously reported in Acropora species, whose eggs do not contain zooxanthellae.  相似文献   

抚顺石油一厂地表变形初步探讨   总被引：4，自引：0，他引：4  

李树德 《工程地质学报》1996,4(2):31-35

石油一厂地表变形的主要因素是西露天矿露天台阶开采, 引起厂南缘边坡失稳、变形和地面沉陷, 同时促使其它因素活化, 更加剧了地裂缝和变形发展。  相似文献   

河滩相软土试验工程观测成果分析   总被引：3，自引：2，他引：3  

贾其军  赵成刚  王晓谋 《工程地质学报》2003,11(3):328-333

以河滩相软土为研究对象,利用沉降板、测斜管、孔隙水压力计等多种测试仪器,选取有代表性的观测断面,进行了一年多的沉降与稳定观测。通过观测数据对河滩相软土的沉降规律进行了分析,同时推算了河滩相软土的沉降系数ms,这对今后在河南省河滩相软土地基上修筑高等级公路具有重要的参考价值。  相似文献   

Liquefaction-induced ground deformations at Hotel Sapanca during Kocaeli (Izmit),Turkey earthquake     

K. Onder Cetin  T. Leslie Youd  Raymond B. Seed  Jonathan D. Bray  Rodolfo Sancio  W. Lettis  M. Tolga Yilmaz  H. Turan Durgunoglu 《Soil Dynamics and Earthquake Engineering》2002,22(9-12):1083-1092

This paper presents a study of liquefaction-induced ground deformations at the Hotel Sapanca site during the 1999 Kocaeli (Izmit)—Turkey earthquake. The paper discusses: (1) observed ground deformations and displacements after the earthquake, (2) the results of field investigations by means of borings and in situ index tests including standard penetration tests (SPT), static cone penetration tests (CPT) and piezocone (CPTU) tests, (3) analyses of observed ground settlements and lateral deformations by a suite of methods, and (4) comparisons of observed and calculated ground movements.  相似文献