扬子地块北缘晚二叠世长兴期岩相古地理

扬子地块北缘与秦岭接壤,晚二叠世长兴期岩石地层单元为长兴组和大隆组。长兴组为一套碳酸盐岩沉积,沉积单元包括台地相、台地边缘礁滩相以及台地边缘斜坡相等;而大隆组则主要为一套灰黑至黑色薄层硅质岩、炭质页岩夹薄层泥晶灰岩,为一套较深水盆地沉积的产物。研究结果表明,这一深水盆地环境大致从西边的广元开始,向东经旺苍、南江与鄂西地区相连成为一广阔海域,扬子地块与华北地块隔海相望。这一沉积格局不仅为油气勘探工作的部署奠定了坚实的基础,而且可能反映出扬子地块与华北地块在此之前已经成为统一陆块。     

东营市城区地热储人工回灌条件及分区研究

地热水资源开发利用往往伴生诸多环境地质问题,人工回灌是解决这些问题的有效和重要手段。影响人工回灌效果的主要因素有地质构造复杂程度、回灌水源类型,热储厚度、渗透性能、储水能力,地热水头大小及溶气状况等。就东营市城区馆陶组、东营组地热水资源的人工回灌条件进行了论述,并利用综合方法开展了分区评价,划分出回灌条件好区、较好区、一般区和较差区。对该区地热水资源人工回灌的可行性进行了讨论,提出了建议。     

合肥市滨湖新区地貌类型划分及特征

通过对合肥市滨湖新区实地调查及遥感解译,在参考国内外城市地貌分类系统的基础上,依据自然地貌强调形态-成因、人工地貌强调生态-形态分类原则,对滨湖新区地貌类型进行了划分、对其特征进行了初步研究,并制作出了滨湖新区地貌图,为合肥市滨湖新区规划和建设提供了地质依据。     

基于环境因子AI-GIS方法的天然滑坡危险性预测--以香港大屿山岛为例

利用人工神经元网络(AI)及地理信息系统(GIS)技术,将多元空间信息分析与非线性理论相结合,建立了基于环境因子的区域滑坡非线性预测模型.选择天然滑坡比较发育的香港大屿山岛中部作为试验研究区,定量分析了滑坡与各种环境因子的空间关系,进行了因子筛选,据此对区域天然滑坡进行了危险性分区.结果表明,该方法可获取较高的预测精度,是完全可行的.该方法的应用将为区域滑坡危险性区划及滑坡灾害的防治提供重要依据.     

Risk evaluation of heavy snow disasters using BP artificial neural network: the case of Xilingol in Inner Mongolia

According to disaster and risk evaluation theory, we proposed an indicator system containing environmental possibilities with hazard, disaster inducing factors and disaster bearing bodies to analyze the risk of heavy snow disaster in Xilingol, Inner Mongolia, based on the analysis of heavy snow events that have occurred in the last several decades. A risk evaluation model of heavy snow disaster was established using back-propagation artificial neural network (BP-ANN). Data obtained from a number of heavy snow events samples were used to train artificial neural network (ANN). The objective of this study is to produce a new evaluation model using BP-ANN for heavy snow risk analysis. As a result, BP-ANN model showed an advantage in heavy snow risk evaluation in Xilingol compared to the conventional method of evaluation criteria equation (ECE) introduced by Inner Mongolia Municipality Animal Husbandry Bureau. Thus, the BP-ANN model provides an alternative method for heavy snow risk analysis in the area.     

Nearshore wave environments around a sandy cay on a platform reef,Torres Strait,Australia

Waves are the primary factor affecting reef-island morphology. This study examines spatial and temporal variations of wave characteristics in the nearshore around Warraber Island, a sandy cay on a platform reef in Torres Strait Australia, based on field measurements during the predominant southeasterly wind season. Water pressure was recorded simultaneously, and transformed to water surface wave spectra, at a location close to the reef edge and across the nearshore at different locations around the island. Wave environments off the reef were estimated based on wave characteristics measured at the reef-edge location and found to be primarily dominated by sea. Low and high wave-energy events were identified, based on wave energy level at the reef-edge location.     

地铁联络通道冻结加固融沉注浆研究

介绍了国内首个地铁联络通道强制解冻融沉注浆工艺的设计与施工。整个施工过程中对土体温度和地表变形进行了监测,得到了温度和地表变形的变化规律。由于冻结法施工中存在冻胀和融沉问题,过量的冻胀、融沉会对地表建筑和地下管线产生危害。结合工程实例,对强制解冻融沉注浆进行了研究,该工程对冻结加固体分区强制解冻、及时进行融沉注浆、二次加固土体,消除了后期压密沉降发生的可能,地表变形的监测表明强制解冻融沉注浆技术在该类工程中应用效果良好。     

黏-弹性人工边界在双江口土石坝动力分析中的应用

应用黏-弹性人工边界于双江口土石坝的动力响应分析中,考察了黏-弹性人工边界及地基辐射阻尼效应对土石坝动力响应的影响程度。计算果表明,该方法比传统的固定边界无质量地基下的大坝加速度动响应结果降低了15%~30%,在土石坝的动力响应分析中应当予以重视。     

人工岛抗浮、防水设计水位选取分析

分析了内陆地区抗浮和防水设计水位的选取方法,以冀东南堡油田2#人工岛工程钻井放喷池抗浮和防水设计水位选取实例,提出了海洋人工岛抗浮和防水设计水位选取方法,并对其影响因素进行了分析。对于人工岛永久性构筑物,抗浮设防水位按岛面高程选取;而临时建筑物或施工期建筑物,可取岛面高程以下0.5～1.0 m。影响抗浮、防水设计水位的主要因素为人工岛的高程和降雨。     

大尺度人工岛沉箱浅水波浪中充气拖航阻力特性探讨

本文对大尺度圆形人工岛沉箱在浅水波浪中低速充气拖航状态下的阻力特性进行了理论分析和计算,指出其阻力以形状阻力为主,而波浪中阻力增值相对较小,但变化规律复杂。对照其模型阻力试验结果,提出了该形状物体的阻力近似计算公式并给出了相应的系数。