TRD工法在地铁车站端头止水帷幕中的应用

在地基含水层深厚或施工环境受到限制等特殊条件下,常采用TRD工法墙替代三轴搅拌桩作为深基坑止水帷幕.深基坑止水帷幕施工质量的好坏,直接关系到基坑降水对周边环境的影响.结合某地铁车站深厚含水层中TRD工法墙的工程实践,介绍了TRD工法止水帷幕施工流程,提出了TRD工法止水帷幕施工控制要点;根据地下水位观测资料,简要分析了TRD工法止水帷幕的止水效果.     

重庆来福士广场深基坑地下水的控制

目前国内基坑地下水控制主要是以高压旋喷桩为代表的注浆止水帷幕和以深井降水为代表的降水帷幕。根据重庆来福士广场深基坑工程的实际情况,通过三次注浆止水帷幕试验与降水帷幕抽水试验,表明在长江滩涂回填区,地质条件复杂、含水层厚度、分布不均匀条件下,降水帷幕效果好于高压旋喷止水帷幕和液压注浆止水帷幕。     

抽水帷幕在基坑地下水控制中的应用研究

深井降水为代表的抽水帷幕技术在工程中得到逐步应用,文中结合工程实例现场试验,分析高压旋喷、压力注浆、素混凝土咬合桩等止水帷幕止水效果不足,提出了抽水帷幕方案,并进行地下水三维非稳定渗流数值模拟,模拟结果和现场止水效果均表明,在滨江地区地质条件复杂、含水层为砂砾层且分布不均条件下,抽水帷幕效果好于高压旋喷止水帷幕和液压注浆止水帷幕,推动了抽水帷幕在基坑地下水控制中的应用。     

谈悬挂式止水帷幕基坑承压降水

悬挂式止水帷幕基坑,由于围护未隔断承压含水层,坑内降水将导致坑外地下水径流补给,坑外地下水损失可能引发周边地表沉降,因此悬挂式止水帷幕基坑承压降水方案设计至关重要。基于某地铁车站基坑对悬挂式止水帷幕基坑承压降水方案设计进行分析、总结,供类似工程借鉴。     

深层搅拌桩止水帷幕在软土地层施工中的应用

以广州地铁三号线大汉区间明挖段为例,就海陆相淤泥质软土地层明挖基坑施工中运用深层水泥土搅拌桩止水帷幕止水、挡淤技术进行了探讨,并指出搅拌桩止水帷幕配合钻孔灌注桩围护结构形式适合在软土地层条件下的市政工程建设中运用.     

超深超大地下室静水浮力释放系统设计研究——以福州仓山区某工程为例

福州仓山区某超深地下室在深厚淤泥中采用静水浮力释放系统设计与施工。该系统是基于基坑止水帷幕插入深度和淤泥渗透慢特性实现的,为一种较先进的绿色设计技术。合理设计此释放系统,可有效降低抗浮水位,可充分节约基础造价、减少施工工期。基此,文章探讨了该基坑止水帷幕作用、渗流水量计算、排水系统设计、应急措施等。     

细砂夹淤泥层地质止水帷幕方式的技术措施探讨

以某污水处理系统污水管收集工程为例,针对人工挖孔逆作法施工中止水帷幕的处理,剖析产生问题的原因,做好预防措施,以寻求控制对策。这为今后工程中细砂夹淤泥层地质情况复杂的止水帷幕施工提供一些经验和借鉴。     

富水砂层悬挂式止水帷幕渗漏处理技术的研究与应用

某地铁车站地层中潜水含水层较厚,基坑采用悬挂式止水帷幕,在基坑开挖过程中基坑侧壁及基坑底出现涌水、涌砂现象。结合实际情况,分析了悬挂式止水帷幕涌水、涌砂的原因,及时采取了基坑内砂袋反压、桩间注浆、轻型井点降水、分段开挖、快速封底的综合处理措施,以确保基坑正常、安全的施工。     

止水帷幕内的桩基施工技术

中海油青岛制造基地三期分段制造车间工程采用围海造田方式进行建设,基地中有部分工程桩正好与外围止水帷幕重合,施工进度受到严重影响。为加快施工进度,确保桩基施工不破坏止水帷幕,在施工过程中采用减小锤重、淤泥黏土护壁、加设流量观测仪、局部增加止水支护墙等办法,解决了此难题。通过131根工程桩的实践考验,证实该项技术简单实用,同时还能降低成本,可以在类似工程中推广应用。     

人工挖孔逆作法施工中水泥搅拌桩的应用

针对人工挖孔逆作法施工中旋喷桩止水帷幕存在的问题,剖析了产生的原因,用工程实践证明:在细砂含水层地质情况下,采用人工挖孔逆作法施工接收井时,用水泥搅拌桩对井位进行处理比旋喷桩止水帷幕施工工艺效果好,为今后工程地质复杂条件下的人工挖孔逆作法施工提供了成功经验。     

吉林省植被分布对地表水与地下水资源的影响分析

通过植被分布规律与水资源分布的内在联系,阐明植被分布对吉林省水资源分布的影响,初步分析了植被分布在水文循环中的作用机制,从微观角度分析了植被分布与水资源分布内在联系。结果表明:吉林省水资源分布与植被分布有着密切的相关关系;植被作为水文循环的一个重要环节,是制约水资源分布规律的一个重要因素;水资源缺乏地区可大量植树造林,调节水资源的合理分布,为社会经济的发展提供必要的条件。     

黔中安顺屯堡聚落水环境与水景观营建研究

水作为重要的自然环境要素,在屯 堡聚落的形成与发展过程中发挥 着十分重要 的作用。文章在系统调研的基础上,分析了 安顺屯堡聚落水环境与水景观营建的4个主 要方面：聚落选址山水相生,主要选址位于 河谷坝子与周边山体交接之处,形成“山— 水—田—林—村”的整体空间格局;因水兴 建重要的屯田安居设施,解决饮用水源、山 地稻耕农作以及污水收集处理问题;凭借河 流水体参与防御体系构建,利用山水之势抵 御外侵,并人工修筑水渠等方式加强聚落防 御性;理水成景,营造稻作农业湿地景观、水 口园林景观等特色山地水景观。     

Water pricing in Tunisia: Can an original rate structure achieve multiple objectives?

In the context of anthropic pressures, the Tunisian Water Utility tries to achieve three objectives: financial (achieving full-cost recovery), social (ensuring access for all), and environmental (incentivizing users to save a scarce resource). After a theoretical review of water pricing, the paper presents how successive reforms in Tunisia have gradually set up an original pricing structure that has become the main instrument of the sector's policy. Using different data and methods, we investigate how each of the three objectives is reached through pricing. We conclude that this pricing policy has led to a relatively stable but partial equilibrium.     

Determinants of water loss in Portuguese utilities

This research aims to evaluate the main determinants of real water loss per unit length of the network in the Portuguese water sector, using data covering a 10-year period. The governance model, typology of the area, type of service, management model, total water conveyed, and total network length were found to be statistically significant determinants. The methodology employed Generalized Linear Models and Artificial Neural Networks, confirming the existence of interactions and non-linearity. From a public policy perspective, setting water loss targets based only on two variables - area typology and type of service – is not a robust approach.     

Managing water demand by contract: a survey of conservation outsourcing in China

The research was to gain insight into the characteristics, driving forces and barriers, specifications, and other issues of water conservation outsourcing contracts (OSCs) in China. Our analysis is based on information obtained from a pre-coded questionnaire, an assessment of OSC documents, and project on-site visits and interviews. The result shows that both parties of the OSCs lack knowledge and experience in preparing contracts. All eight contract documents are underspecified, which is the key reason for the existing disputes found in all OSCs studied. Recommendations are provided by this research to improve China's OSCs in the future.     

贵州村镇供水工程净水技术的选择

分析了贵州村镇供水工程现状及特点,并结合我省供水工程运行经验,提出适用于贵州村镇的净水技术,有利于保障居民饮用水安全、提高供水水质、降低供水成本,保证供水工程能取得良好的社会、经济、环境效益。     

Innovative water rates as a policy tool for drought response: Two case studies from Utah,USA

Drought in the Western U.S. has elevated the need for innovative water pricing. We describe two utilities whose novel pricing structures reflect water availability and reasonable use expectations. One has a physical basis of water rights, landscape water needs, and irrigated area; the other has a hydrologic basis of an annual water supply forecast. Both utilities charge users tiered (increasing block) rates for an adjustable water allotment. The rates have proved hydrologically beneficial, socially equitable, and financially sustainable during the drought, suggesting that water pricing can be an effective policy tool for responsive water management.     

预拌混凝土行业用水现状分析

通过数据调研、实地走访等方式研究了我国预拌混凝土行业用水情况,并基于水平衡测试结果分析了各生产环节的耗水情况,为开展预拌混凝土行业用水研究以及制定相关标准工作提供参考。     

Operational drivers of water reuse efficiency in Portuguese wastewater service providers

Identifying the service providers that perform best in key operational indicators is important for increasing the sustainability of the wastewater treatment sector. Wastewater reuse is increasingly considered as a relevant aspect in this context. The current study first identifies the Portuguese service providers in the efficiency frontier regarding wastewater reuse and proceeds to identify its main operational drivers. Reused wastewater was then successfully estimated using the selected drivers. The main policy recommendations, resulting from this study, towards wastewater reuse upsurge include fostering the aggregation of smaller SP to benefit from economies of scale, and strive for adequate infrastructure maintenance practices.     

地热水系统运行障碍的控制途径

一、引 言 地热水是本世纪以来开发利用的新能源,是世界第三代能源之一,是一种兼有热源、水资源和矿物资源多种功能的特殊资源,其开发利用价值极高。但是地热水在利用系统中的腐蚀、结垢问题一直是开发利用地热能的严重障碍,是当今世界性重要研究课题之一。 二、地热水开发利用的障碍 与控制途径分析 地热水由其成因决定了它既具有高温,又含有多种化学成分和具有相当高的矿化度。如属于天津奥陶系热贮层的热28井地热水的矿化度竟高达4710ppm,其主要化学成