四川省蓬溪县安置点地质灾害危险性评估

通过对天福镇三关村安置点建设用地的地形地貌、地层岩性、地质构造与区域稳定性、水文地质条件等工程地质条件的分析,对场地进行了危险性现状评估、预测评估及综合评估,并提出了灾害防治建议。     

基于OGC WPS的遥感图像分布式检索系统研究

结合OGC WPS开放标准规范和分布式检索技术,提出基于OGC WPS构建遥感图像分布式检索系统的方法。采用Z39.50通用检索表达式的扩展模式,避免了遥感图像编目数据库与检索系统的紧密耦合;采用HTTP/XML定义检索网关和资源节点之间的WPS接口,实现了编目资源节点到网关的动态接入与移出机制。最后运用开放源代码GIS技术开发了一个原型演示系统,试验证明上述方法切实可行。     

Inversion of coseismic stress-triggered fault slips using borehole strainmeter observations

Coseismic stress-triggering is becoming a new hot spot of research. Coseismic strain steps recorded by borehole strainmeters are particularly valuable in studying coseismic stress-triggered fault slips. Based on the theory of dis location, one can invert the triggered fault slips with such data if he/she has a well understanding about the local faults. Genetic algorithm can be applied to significantly raise the efficiency of searching a best solution among all possibilities in this kind of inversion. A testifying check of the program and analyses of each parameter＇s influence may further enhance the reliability of inversion results. Taking complexity of geological structure into account, the inversion results should be regarded as the predominant property or a comprehensive effect of triggered local faults＇ activities. As an attempt, we inverted the assumingly active faults＇ slips triggered by the Ms=8.1 Kunlun Mountain earthquake over Beijing area.     

梨树断陷断陷期小宽断裂带构造应力场数值模拟

在小宽断裂带构造解析基础之上,根据地质资料以及前人提供的岩石物理学参数建立了梨树断陷区的二维地质和数值模型。进行了构造应力场数值模拟,分析了梨树断陷小宽断裂带断陷期小宽断裂带断陷期在沙河子期(K1sh)、营城期(K1yc)、登楼库期(K1d)的构造应力场特征。模拟结果显示：(1)沙河子期在左旋走滑应力状态下,小宽断裂带处于近NE—SW方向的拉张应力状态,剪应力在沿着断裂带SW—NE走向逐渐减小; (2)营城期在右旋走滑的应力状态下,小宽断裂带处于近NW—SE向的拉张力状态,剪应力最大值位于断裂带的最中间部位;(3)登楼库期在左旋走滑的应力状态下,断裂带处于SWW—NEE向的张拉应力状态,剪应力最大值位于断裂带西南段。     

国际工程承包中的成本控制

承包商在实施国际承包工程中，主要目的是为了追求利润。为达此目的，必须对成本进行控制。要实现成本控制目标，必须对影响成本的主要因素、成本控制的基础、成本控制的主要环节基本清楚。下面就笔者在国际承包工程中的经验教训谈些粗浅认识，或许对读者有所裨益。     

国家数字地震台网中心实时观测数据接收技术

国家数字地震台网47个数字化地震观测台站的地动实时观测数据,通过卫星信道传送到国家数字地震台网中心,再经信号分配器传至7台实时处理机。47个台的信号分成3个区域以3组计算机互为实时热备份的方式接收和处理地动波形数据。     

利用点云检测室内导航元素的方法综述

根据建筑物室内墙壁的空间姿态特征, 建立了一种自动绘制室内平面图的点云向量追踪算法。首先截取一定厚度的室内墙体点云并将其投影至水平面, 在投影平面上建立正方形格网, 对投影后的平面点进行分割管理, 并通过八邻域算法对网格内点云进行聚类。然后采用网格重心法对聚类后的点云数据进行抽稀, 并根据邻域内点间距与连线向量夹角大小对抽稀后的点进行追踪排序, 建立追踪方向的向量序列, 结合向量序列中相邻值夹角的突变情况完成不同墙面的点云分割。最后采用最小二乘算法对分割得到的相同墙面点云进行直线拟合, 求取相邻墙体直线的交点, 建立房屋墙体平面投影线段及其空间连接关系, 依序输出墙体投影线段, 完成房屋平面图的绘制并导出DXF格式数据交换文件。通过对某小区建筑物室内扫描数据的分析, 对所提算法进行验证, 结果表明所提算法可准确快速地对室内三维激光扫描点云进行分析处理, 并完成室内建筑物平面图的绘制。     

围垦区地下水位的控制及计算方法

利用抽水井群和注水井群可以控制生态围垦区的地下水位.研究了潜水抽-注水井(群)耦合作用下浸润线的求解方法,利用势流理论和镜像原理,在假定含水层水平及土层渗透系数各向同性的条件下,推导出完整抽-注水井(群)耦合作用时浸润线的计算公式及非完整抽-注水井(群)耦合作用时浸润线的计算公式,还对潜水单个非完整抽水井及非完整抽-注水井群耦合作用时的解析解和数值解作了比较,结果表明,两者吻合得较好.同时还给出该理论用于地下水位控制中求解抽水量和注水量的方法等,对工程设计有实用价值.     

The Classification and Model of Coalbed Methane Reservoirs

Coalbed methane has been explored in many basins worldwide for 30 years, and has been developed commercially in some of the basins. Many researchers have described the characteristics of coalbed methane geology and technology systematically. According to these investigations, a coalbed methane reservoir can be defined: "a coal seam that contains some coalbed methane and is isolated from other fluid units is called a coalbed methane reservoir". On the basis of anatomization, analysis, and comparison of the typical coalbed methane reservoirs, coalbed methane reservoirs can be divided into two classes: the hydrodynamic sealing coalbed methane reservoirs and the self-sealing coalbed methane reservoirs. The former can be further divided into two sub-classes: the hydrodynamic capping coalbed methane reservoirs, which can be divided into five types and the hydrodynamic driving coalbed methane reservoirs, which can be divided into three types. The latter can be divided into three types. Currently, hydrodynamic s