Reliability back analysis of shear strength parameters of landslide with three-dimensional upper bound limit analysis theory   总被引：1，自引：1，他引：0  

Lian-Heng Zhao  Shi Zuo  Yu-Liang Lin  Liang Li  Yingbin Zhang 《Landslides》2016,13(4):711-724

It is essential to determine the shear strength parameters c and φ on the sliding surface for stability evaluation and engineering design of a landslide. In this study, a new parameter back analysis method is proposed by combining the 2D/3D upper bound method of limit analysis and reliability theory to accurately determine the shear strength parameters for a 3D slope with a single failure surface. The proposed reliability back analysis method overcomes the shortcomings of the traditional deterministic analysis method of slope stability that cannot take into account the randomness and uncertainty of geotechnical parameters. Based on the reliability theory, two methods were studied: first-order reliability method (implemented by spreadsheet and Matlab, called spreadsheet method and constrained optimization method, respectively, in this paper) and Monte Carlo simulation. The optimized values of c and φ were obtained by establishing only one balance equation with the consideration of the pore water pressure or other complex conditions, which can solve the problem of the back analysis of strength parameters for a single 3D sliding surface condition. The correlation research showed that the negative correlation between c and φ greatly affected the back analysis results, and the reliability index values were conservative without considering such a negative correlation. A case study for the back analysis of shear strength parameters is conducted based on a practical landslide model with a broken line slip surface slope in Zhuquedong village, Luxi town, Xiangxi County, Hunan Province, China, and a suggestion for the selection of landslide cross section is presented. The results show that the back analysis results determined by the reliability theory coincide well with the survey and experimental results. The proposed method is found to be more accurate and effective in determining the values of shear parameters than that of the traditional deterministic inversion method.  相似文献   

Maximum sustainable yield estimation of enhancement species with the characteristics of movement inside and outside marine ranching     

Wang  Yingbin  Zhang  Wei 《中国海洋湖沼学报》2021,39(6):2380-2387

Journal of Oceanology and Limnology - Marine ranching can be regarded as a type of artificial fishery, and its construction aims at the sustainable utilisation of fishery resources. Therefore, the...  相似文献   

市县级自然资源地理块数据研究与应用     

吴勇  吴颖斌 《测绘地理信息》2021,46(4):144-147

为解决自然资源部门成立后数据来源复杂、使用效率低下的问题,设计了以地理实体为技术核心的自然资源地理块数据体系.通过数据叠加、业务融合,将自然资源常规业务所涉及的地理对象重新划分为管理区域、管理单元、建筑物及设施3个层级,并基本保持了对原数据的位置、属性的继承,可以应用于日常的城市更新、土地收储、规划管控、违法监测等业务.自然资源地理块数据具有信息完整、简洁清晰的特点,从原来的横向业务视角转变为竖向的地理对象视角,通俗易懂,方便使用.  相似文献   

Impacts of distorted fishery statistical data on assessments of three surplus production models   总被引：1，自引：0，他引：1  

��ӭ��  ֣��  ���� 《中国海洋湖沼学报》2011,29(2):270-276

We evaluated the effect of various error sources in fishery harvest/effort data on the maximum sustainable yield(MSY) and corresponding fishing effort(EMSY) using Monte Carlo simulation analyses.A high coefficient of variation(CV) of the catch and effort values biased the estimates of MSY and EMSY.Thus,the state of the fisheries resource and its exploitation was overestimated.We compared the effect using three surplus production models,Hilborn-Waters(H-W),Schnute,and Prager models.The estimates generated us...  相似文献   

Estimation of Natural Mortality Coefficient from Fish Abundance and Catch Data Using Virtual Population Analysis(VPA)     

WANG Yingbin  LIU Qun*  and WANG Yanjun College of Fisheries  Ocean University of China  Qingdao  P. R. China 《中国海洋大学学报(英文版)》2007,6(1):53-59

1 Introduction Natural mortality coefficient (M) is one of the key population parameters common to most analyses in fish stock assessment. Many mathematical models of fish stock dynamics include M directly or indirectly. However, until now M is the least known among the four factors affecting fish stock variation: recruitment, growth, natural death and fishing death (Quinn and Deriso, 1999). There is an extensive literature concerning the impact of errors in M on stock assessment (Mertz and…  相似文献   

A new approach of combining aerial photography with satellite imagery for landslide detection     

Yange Li  Guangqi Chen  Bo Wang  Lu Zheng  Yingbin Zhang  Chuan Tang 《Natural Hazards》2013,66(2):649-669

Subsequent rainfall after a strong earthquake can easily trigger landslides. Aerial photography is always available after a strong earthquake but not always available in a timely manner after a subsequent rainfall following the earthquake. Sometimes, only panchromatic imagery is available because of its relatively low cost and large cover capacity. To detect multi-temporal landslides induced by earthquake and its post long-term effect, in company of other factors such as subsequent rainfall, traditionally, it needs to carry out image classification multi-times to calculate the variance information. Therefore, the accuracy will be affected by accumulated errors from multi-classification, and the process is very time-consuming. In this paper, a new semi-automatic approach combing aerial photograph with satellite imagery was proposed for rapid mapping of multi-temporal landslides. The approach can enhance the change information of each landslide event in one detection process. In addition, slope units were introduced to separate the detected conjoint landslides. Chenjiaba area, which located in the highest seismic intensity zone of Wenchuan earthquake in Beichuan, China, and had a strong rainfall 4 months later, was selected as a case study to demonstrate the usefulness of this methodology. Accuracy assessment was carried out by comparing those extracted ones with a manually prepared landslide inventory map. Correctly detected were 90.1 and 94.2 % for earthquake-induced landslides and new landslides, respectively. Results show that this approach is capable of mapping different temporal landslides efficiently and quickly.  相似文献   

C Builder中基于ADO的数据库访问方法     

张静  董英斌 《河南气象》2007,(Z1)

介绍了C Builder中ADO数据库访问控件的属性及其使用方法,并以Access 2000数据库为例,给出了如何利用ADO控件对数据记录进行添加、查询的操作方法。  相似文献   

渤海海域辽东湾坳陷正断层联接及其转换带特征   总被引：3，自引：0，他引：3  

余一欣  周心怀  汤良杰  魏刚  王应斌  吕丁友 《地质论评》2009,55(1):79-84

渤海辽东湾坳陷发育的大量正断层通过硬联接和软联接的形式发生了相互作用,并形成了丰富的转换带。根据正断层的倾向及其组合特征,将正断层软联接类型分为同向、对向和背向叠覆型三类,其形成的转换带类型相应分为转换斜坡、斜向背斜和地垒。发育在正断层叠置段内的转换带传递了正断层之间的伸展应变量,使其在三维空间里保持应变守恒。辽东湾坳陷转换带的形成演化主要经历了孤立正断层、转换带形成、转换带复杂化和转换带破裂等四个阶段。  相似文献   

CSAMT和浅层地震在松辽盆地西南部铀矿勘查中的应用   总被引：1，自引：0，他引：1  

李英宾  李毅  魏滨  刘波  张占彬  杨明 《地质与勘探》2019,55(6):1442-1451

浅层地震反射波法和可控源音频大地电磁测量在铀矿勘查中各有优缺点。为了提高矿勘查提的效率,本文介绍了以可控源音频大地测量(CSAMT)为主、浅层地震反射波法为辅的综合物探方法在松辽盆地西南部铀矿勘查中的应用实例。通过CSAMT和浅层地震联合测量解释两条控盆断裂,查明四方台组和明水组顶底界面埋深约200～400m,呈椭圆形北东向分布,由盆地边部向凹陷中心地层由薄变厚;工作区基底埋深约700～1000m,呈宽缓波浪状展布;并对两种方法进行了对比分析:当勘探深度大于700m时,浅层地震反射波法对地层划分、查明基底埋深和基底断裂效果更好。经钻孔验证表明,合理利用CSAMT与浅层地震联合方法在松辽盆地西南部铀矿找矿工作中具有可靠、经济的优势,具有较强的应用价值。  相似文献   

裂隙岩体爆破破碎阻力特性分析     

张拔川  李功伯 《现代地质》1997,11(3):354-357

对裂隙岩体的爆破破碎阻力特性进行了研究，提出了裂隙岩体爆破阻力矢量的概念和研究方法。以单元结构体作为主要研究对象，建立了爆破阻力矢量与岩体实际阻力矢量的关系模型。作为一种研究方法，它对裂隙岩体的爆破破碎的理论研究及施工技术的研究具有一定的实际意义。  相似文献