提高节理面c和φ对岩坡开挖变形的影响

为了反映岩质边坡在节理面注浆后的变形效应,首先,通过室内试验,分析注浆前后岩体变形和破坏的全过程,以探讨其抗剪性能(粘结力c和内摩擦角φ)的变化;然后,基于理想弹塑性本构模型的Mohr-Cou-lomb准则,运用拉格朗日元数值方法(FLAC3D),对岩坡注浆前后变形效应(水平位移、垂直位移、剪应变增量)进行模拟。结果表明:注浆加固后,岩体的位移场变得均匀和连续,节理面处的较大位移受到抑制,边坡的整体性得到提高,有利于边坡的稳定性。     

可移动充气式应急救护装置的研究

可移动充气式应急救护装置是一种重点针对地铁火灾的新型消防抢险救援装备,主要由风机、风管、救护站及其他辅助设备组成,其工作原理是采用机械通风的方式在救护站内建立正压,阻止外界烟气进入,从而在充满烟气的事故现场建立一个没有烟气的临时安全场所。可用于救助受困人员,方便消防员更换装备和休息调整,以及便于消防部队建立前沿临时指挥点等,为消防部队处置地铁火灾提供了解决问题的新思路和新方法,对提高消防部队在地铁火灾中的抢险救援能力有着重要的作用。除此之外,还可用于其它类型的地下建筑、大空间建筑(如商场)等场所的消防抢险救援。     

Fe^0对饮用水中砷的去除效率及影响因素

研究零价铁（Fe^0）的除砷效果,试验考察了Fe^0投加量、接触时间、pH值、DO浓度、温度、腐殖质、竞争性阴离子（SO4^2-,NO^3-,SiO2^3-,H2PO3^-,HCO3^-）对Fe^0除砷效率的影响。结果表明,Fe^0（80目）投加量为2g/L,接触时间180min,pH值为6.5,DO值6.5mg/L的条件下,对质量浓度为1mg/L的含砷水样,Fe^0对As（Ⅴ）的去除率高达96.5%,而对As（Ⅲ）的去除率只有75.8%。降低水样pH值或提高DO可显著提高Fe^0的除砷效率,温度对Fe^0除砷影响不大,水体中的腐殖质、磷酸盐、硅酸盐的存在会由于竞争性吸附而导致Fe^0除砷效率下降。采用Fe^0颗粒去除饮用水中的砷高效、经济,具有良好的应用前景。实际应用中,对于DO值较低的地下含As水,可通过充氧提高Fe^0除As效率。当水体中腐殖质、磷酸盐或硅酸盐浓度较高时,应考虑采取相应的预处理措施。     

The effect of conservation tillage in managing climate change in arid and semiarid areas—a case study in Northwest China

Mitigation and Adaptation Strategies for Global Change - Coastal cities are exposed to high risks due to climate change, as they are potentially affected by both rising sea levels and increasingly...     

Fuzzy AHP-based study of cleaner production implementation in Taiwan PWB manufacturer

In recent years, many electronic manufacturing firms have looked upon Cleaner Production (CP) as the means by which they could maintain environmental practice and competitive advantages. CP has been adopted by companies as an important factor in enhancing industrial productivity. Sustainable projects that deal appropriately with environmental and social factors are also more likely to be the most profitable.This paper investigated the criteria and attributes that determine a successful adoption and implementation of CP in reference to PWB manufacture in Taiwan. Fuzzy Analytic Hierarchy Process (FAHP) methodology is used to discuss the different decision criteria that include Organizing, Systems and Technologies, Measurement and Feedback, Working environment and Worker's Culture which are all vital factors in an effective CP implementation. AHP is an efficient tool in controlling the fuzziness of the data involved in choosing the most preferred decision variables. The linguistic level of comparisons produced by the manufacturers and experts are tapped and constructed in a form of triangular fuzzy numbers in order to construct fuzzy pairwise comparison matrices. The implementation of the system is demonstrated by a problem involving three stages of hierarchy which contains different criteria and attributes at a wider perspective within an environmental uncertainty. The findings advocate that these enterprises would need to setup the priorities of the CP implementation. The results suggest a generic hierarchical model of organizations of which the highest level is to be prioritized among the CP implementation factors.     

峒室大爆破的安全问题

全面总结了峒室大爆破设计和施工方面的安全，并给出其实施方案