Engineering properties of Hınıs ignimbrites and their usability as a building stone (Erzurum, Turkey)

The survival of several ancient monuments made of ignimbrites in Hınıs town (Erzurum-Anatolia), which has suffered from intense annual temperature fluctuations and strong seismic activity, can mainly be attributed to use of suitable building stones. This paper examines the usability as building stones of Middle Miocene Hınıs ignimbrites that widely outcrop in and around Hınıs town. The petrographical, geochemical, mechanical, and physical properties determined lead to categorization of the ignimbrites as four different types. The Hınıs ignimbrites contain dasite–trachy–andesite and rhyolite. Rhyolite is the strongest material whereas the other types, being more porous, are weaker, lighter, and have good heat-insulation properties. Being light (easily transportable, machinable, and workable), good heat insulators, environmentally friendly (because of natural ventilation), sufficiently elastic to sustain seismic loading in the area under study, and more cost-effective than artificial stones, Hınıs ignimbrites are certainly a preferable option for use as light building stone. These ignimbrites are not suitable for use as floor covering, however, (because of rapid abrasion) or for building structural columns (because of low strength).     

东营通61断块沙河街组二段储层物性参数展布特征研究

本文在沉积相研究基础上对通６１断块内下第三系沙河街组二段地层的孔隙度、渗透率值做平面展布,统计主要沉积微相的储层物性参数分布规律,分析各沉积微相的储层特征,揭示了沉积微相对储层物性参数展布的控制作用,并指出研究区内的有利砂岩储集层。     

浅层地震反射波法在某些特殊工程地质中的应用效果

本文通过应用浅震反射波法解决浅部滑坡体、孤石、基桩持力层等特殊工程地质问题，阐明浅震反射波法在工程勘察中具有良好的应用效果及应用前景。     

某水电站库区泥石流发育特征及其非线性特性研究

通过对某水电站库区内12条主要的泥石流沟从沟道数与流域面积,沟道数与主沟长,沟道数与沟谷坡降关系上研究了库区内泥石流沟发育的非线性特征,并通过其双对数曲线方程得到了各自的分维数,其意义是在对泥石流危险度评判中为各因素权重的求取提供一个定量的手段,并据此可利用非线性技术来解决泥石流灾害研究中的预测及防治等主要问题,为泥石流灾害防治提供新的思路。     

灰色系统理论在矿床经济评价中的应用

以灰色理论为基础，结合石材矿床实例，详细介绍了综合灰色聚类分析、灰色关联度分析以及灰色局势决策分析等方法的灰色经济评价方法体系，并给出了石材矿床实例应用的结果。     

碎石桩复合地基承载力性状分析

按等置换率原则建立碎石桩复合地基有限元计算模型，在考虑基础刚度、荷载强度变化条件下对比分析了天然地基与复合地基附加应力分布特征、塑性区扩展规律；根据有限元计算结果分析了桩身荷载传递规律并与实测结果对比确定桩身应力随桩身呈指数衰减。计算结果还表明：桩土应力比不仅与桩土模量比有关，也与荷载水平及置换率有关；在鼓胀破坏情形下桩体侧向变形性质取决于桩周土而与置换率、模量比、桩长无关。     

湘西北岩溶石山物探找水数据处理方法实例

应用电测深导数计算、联合剖面法ρ_s曲线歧离带变化率的计算、多剖面互相关处理及激发极化法数据处理等数据处理方法,能有效地提高含水构造异常的分辨力,在西南贫困岩溶石山地区地下水资源勘查开发中发挥了重要作用。     

Microbial production of CO2 in red soil in Stone Forest National Park

Lunan stone forest is a kind of typical karst in China,Which is mainly developed under red soil.In the winter of 1999,three study sites were chosen in stone forest national park according to vegetation cover,geomporphologic location and soil types,CO2 concentration was measured with Gastec punp at different dephts of soil (20,40,60cm) and at the same time soil samples were gatered and soil properties such as soil moisure,pH,soil organic content were analyzed and the total nmuber of viable microbes were counted in laboratory,In the study,dependent variable was chosen as the mean soil log(PCO2),and soil properties were chosen as the independent variables.Multiple stepwise regression analysis showed that the totla amount of microbes and soil moisture are the best indicators of the CO2 production,With the equation LOG(PCO2)=-0.039(TNM)-0.056 (Mo) 1.215 accounting for 86% of the variation of the soil CO2 concentration,where TNM is the total number of microbes in teh soil and Mo is the moisture of soil sample.     

碎石注浆桩在深厚层软基处理中的应用

碎石注浆桩是碎石桩与压力注浆两者融合在一起的新型软基加固技术。目前,该项技术在沿海铁路甬台温和温福线得到了大量应用,加固深厚层软土地基的效果完全满足设计要求。就碎石注浆桩在新温州车站深厚层软土地基路基工点的应用情况做一简单的阐述。     

大直径、高置换率振冲碎石桩复合地基桩土应力特征试验分析

结合一次试桩案例,探讨分析了大直径、高置换率振冲碎石桩处理东部沿海地区填海地基的桩土应力分布特征和一般规律,并提出了一些新的理论和见解。