Treatment of gas-phase methanol in conventional biofilters packed with lava rock

The performance of laboratory scale methanol-degrading biofilters packed with lava rock was checked during almost 1 yr under different conditions. The biomass concentration and biomass adaptation of the inoculum dramatically affected the start-up and the performance of the systems during the first stages of operation. A fast start-up was obtained when using concentrated and adapted inocula, while diluted or non-adapted inocula proved to be much less efficient. The performance of the reactor during long-term operation was significantly affected by the toxic load and moisture content of the gas. Critical loads between 120 and 280 g/m(3)h were reached during different phases of the study. The reactor had a high stability to EBRT changes when working at values between 48.0 and 91.1s, showing little or no negative effect when decreasing the EBRT. Hardly any difference was observed regarding performance when using either a downflow or upflow feed, although slightly better results were obtained when working in a downflow mode.     

我国岩石动力学研究状况与发展

从8个方面概述了我国岩石动力学的研究状况，同时就岩石动力学学科发展与研究趋向提出了个人看法。     

小断面特硬岩隧道爆破技术

针对小断面特硬岩隧道的特点,提出了利用增加中空眼数量来增加临空面,合理确定周边的间距及装药量,保证了小断面特硬岩隧道爆破进尺,同时使爆破质量达到预期的效果。     

冻土区电杆直埋式基础变形规律研究

结合青藏铁路门型电杆的基础形式,对直埋式基础的设计及工程处理措施进行了研究,同时对已完工的门型电杆进行了变形观测,提出了在高原地区做变形观测应注意的事项,结果表明,在冻土地区采用换填油砂直埋式基础可以有效地防止冻融循环过程中产生的冻拔,能够满足承载力的要求,该基础形式是合理可行的。     

龙潭隧道右线出洞口开挖与支护数值模拟

以龙潭隧道右线出洞口为例,采用三维快速拉格朗日差分法(FLAC3D),对其施工开挖过程及支护进行了模拟,得出了一些建设性的结论,对工程的施工具有指导意义。     

软岩冻融损伤的水-热-力耦合研究初探

冻融力学研究正温、负温环境交替变化对材料的物理力学性质的影响。由于软岩为强度低、孔隙度大、胶结程度差、含有大量膨胀性粘土矿物的松散、软弱岩层。因此,软岩的水-热-力耦合不是一个简单的过程。初步提出了软岩的水-热迁移机理,进而提出了软岩水-热-力耦合的基本数学模型。最后用ANSYS软件模拟了隧道围岩温度场与应力场,得到了隧道围岩冻胀力的分布趋势。     

Profiles of mean wind speeds and vertical turbulence intensities measured at seashore and two inland sites using Doppler sodars

The authors’ group has been conducting full-scale measurements of wind velocities with Doppler sodars. It is very important to accurately assess the profiles of mean wind speeds and turbulence intensities in relation to terrain roughness. In this study, the profiles were evaluated for all data measured over a long period at a seashore and two inland sites. It is confirmed that for strong winds the profiles can be approximated by a single power law at altitudes between 50 and 340 m. The power law exponents of the mean wind speed profiles are approximately 0.1 for wind from the sea and 0.2-0.3 for wind blown over land. Those of the turbulence intensity profiles are approximately 0 and −0.2 to 0.4, respectively.     

桐子林隧道塌方处理技术

结合工程实际,主要介绍了在塌方段围岩长时间不能稳定的条件下处理隧道塌方的施工方案及施工技术,提出了塌方处理应注意的事项,达到了安全、快速处理软弱破碎围岩塌方的效果。     

某教学楼墙体裂缝原因分析及加固处理

通过对某教学楼墙体裂缝的鉴定分析,提出了造成墙体裂缝的地质原因和外在原因,并给出了基于沉降控制的防沉锚杆基础托换加固方案,经观测,该方案是合理可行的。     

台灣高鐵隧道工程施工現況

概述了台灣高鐵隧道的設計要求、沿線地質概況及岩體分類、典型地質之隧道施工方式、軟弱地質之輔助工法以及至2003年3月31日止的施工進度。