强夯施工对既有建构筑物的影响分析和保护应用

通过实际案例,分析了强夯施工对既有建构筑物的影响程度、消除影响可采取的措施及其效果,对强夯施工提出了可行的保护性应用措施。     

强夯法处理大型油罐地基的应用及评价

大型原油罐区在选择地基处理方案时,必须进行科学的分析。本文针对人工填海这种地质条件,分析了试夯过程的监测数据和检测结果,确定强夯参数,控制强夯加固地基的质量。     

强夯工程隔振沟效果及周边环境安全影响分析

研究强夯工程对周边环境振动影响规律,依托福建巴陵石化20万吨/年己内酰胺项目,对有无采取隔振沟的振动规律进行对比分析,并对周边围墙和管网以及模拟厂房和设备进行振动测试,得出地面竖向振动速度衰减公式,确定其安全距离,提出强夯施工减振相关措施。结果表明：(1)当测点距夯点33m时,采用隔振沟的地面水平径向减振衰减率达到79.50%,当测点距夯点83m时,采用隔振沟的地面水平径向减振衰减率达到65.91%,对水平切向的减振效果不明显。(2)强夯振动在传播过程中呈现出前期衰减较快,后变缓的趋势,随着夯点距离的增大,地面三向振动速度也随之减弱,对周边环境影响越低。(3)强夯施工对围墙和管网的地面竖向振动衰减公式为y=11.19e⁽(-0.06x)),其安全控制距离约为35m。对厂房和设备的地面竖向振动衰减公式为y=12.10e⁽(-0.046x)),其安全控制距离约为70m。     

浅析建筑工程强夯式地基施工监理

建筑地基基础施工虽然只是一个分项工程,但是对于其的施工监理的重要性不容忽视,从基础阶段就抓好地基工程的技术、质量和安全生产,是工程成功的关键。地基工程的施工,存在诸多不确定安全因素,因此建设各方主体-建设、设计、施工、监理、监测必须秉诚相互配合,通力合作,措施到位,管理到位,才能确保基坑工程的质量安全,达到经济效益与社会效益双赢的成效。     

强夯法的设计与信息化施工

详细介绍了强夯法的设计程序和施工步骤 ,强夯法对提高地基承载力效果显著。但在施工中经常会碰到一些意想不到的情况 ,信息化施工对处理和解决这些问题极其重要     

市政道路工程软土路基强夯施工技术浅析

软土路基在一定程度上影响着市政道路工程施工质量,会增加沉降量,产生大量裂缝。针对这一问题,介绍强夯法软土路基施工技术,涉及设备的选择、施工参数的测量、施工操作步骤的确定及强夯质量的控制等技术要点。通过实例应用分析证明,该技术在实际应用中能够有效降低软土路基沉降量,并实现对裂缝的有效控制,从而促进软土路基施工质量的提升。     

大气环境影响评价环境现状监测的技术要点

介绍了现状监测工作在大气环境影响评价中的价值,探讨了大气环境影响评价环境现状监测的技术要点,希望能够达到提升现状监测水平这一目的,提升大气环境质量,为我国环境保护工作的顺利开展提供支持.     

浅谈高填方填筑体强夯地基处理施工技术

本文以陕西延安煤油气资源综合利用项目场平工程为例,介绍了施工过程中通过结合本区域的地形、地质条件,采取合理有效的施工,填筑体最终达到了相应的密实效果和承载力,从而保证了工程质量,可为类似工程提供相关参考。     

复杂环境下的隧道爆破振动控制技术及应用

由于市区周边建筑物众多,涉及住宅、公路、高压铁塔等,隧道开挖时爆破产生的振动若不加以控制可能对这些建筑物造成不可逆的破坏,使居民和施工单位蒙受巨大的损失和承受较大的安全风险。因此,摸清爆破用药量、布孔、爆破位置与建筑物位置距离等与振动的关系,以达到控制爆破振动的目的,是市区隧道开挖爆破的关键。本文以国道212线广元南山隧道工程为例,运用理论分析和现场监测的方法,在对周边地质条件以及复杂环境分析的基础上,收集爆破数据加以分析,编制施工方案和爆破设计方法。     

地下水污染环境评价探讨

水资源是人类正常生产生活必须的资源.近年来,随着人们生产生活活动范围的不断扩大,对于水资源的需求日益增加,越来越多的水资源被消耗掉.在工业化、城镇化进程不断加快的今天,人们在消耗水资源的同时,造成了水资源污染不断严重和环境破坏严重的问题.基于此,要重视对水资源的保护,认真探索水资源环境保护评价,采取科学合理的水资源保护...     

强夯及强夯置换法处理膨胀土地基

结合中材国际总承包的广西都安鱼峰西江水泥有限公司6000t/d熟料线配套纯低温余热发电项目工程实例,介绍了强夯及强夯置换法应用于膨胀土地基的处理,处理后的地基承载力特征值经检测均满足设计要求,为今后类似工程的设计施工提供借鉴和参考。     

强夯和强夯置换技术在某总包工程中的应用

针对喀喇沁草原水泥有限责任公司4500t/d熟料水泥生产线协同工业尾矿处理及配套9MW纯低温余热发电项目的场地地质条件、施工条件等,采用强夯法和强夯置换法对地基土及较厚回填土地基进行处理。简要介绍了该项目的地基情况和建(构)物地基处理方案;详细介绍了强夯法和强夯置换法处理地基的作用原理、施工工艺及试验检测过程。结果表明:该项目采用强夯法和强夯置换法处理地基是正确可行的,处理后的地基承载力特征值和地基压缩模量均有显著提高。     

真空动力固结加固吹填土地基的试验

结合河北省某大面积吹填土地基处理工程,对真空动力固结在加固含饱和粉质黏土夹层的吹填土中的工艺参数进行了现场试验研究。通过对加固过程中超静孔隙水压力、深层沉降、强夯工艺参数等的分析研究,探讨了真空动力固结应用于含淤泥质粉质黏土夹层吹填砂土的加固机理。试验研究表明,真空动力固结处理吹填土地基取得了良好的加固效果,可为类似工程提供借鉴和指导。     

Study of cold powder compaction by using the discrete element method

The discrete element method (DEM), based on a soft-sphere approach, is commonly used to simulate powder compaction. With these simulations a new macroscopic constitutive relation can be formulated. It is able to de-scribe accurately the constitutive material of powders during the cold compaction process. However, the force-law used in the classical DEM formulation does not reproduce correctly the stress evolution during the high density compaction of powder. To overcome this limitation at a relative density of about 0.85, the high density model is used. This contact model can reproduce incompressibility effects in granular media by implementing the local solid fraction into the DEM software, using Voronoi cells. The first DEM simulations using the open-source YADE software show a fairly good agreement with the multi-particle finite element simulations and experimental results.     

Polyamidoamine dendrimers as curing agents: The optimum polyamidoamine concentration selected by dynamic torsional vibration method and thermogravimetric analyses

Polyamidoamine (PAMAM) dendrimers were investigated as curing agents in bisphenol A epoxy resin systems. The cure behavior of epoxy resin/PAMAM at varying components was investigated by a dynamic torsional vibration method (DTVM); the thermal behavior of the materials was characterized by means of thermogravimetric (TGA) analyses. The DTVM results show that 10/100 parts of the resin (phr) PAMAM was the optimum concentration for 1.0, 3.0, and 5.0 G PAMAM dendrimers/resin systems in our experiment. Also, the TGA results agreed with the conclusions made by the DTVM. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 1430–1434, 2007     

Solid phase compaction of polymeric powders: effects of compaction conditions on pressure and density variations

In a recent communication it was shown that the pressure losses during the solid phase compaction of a polymeric powder could be predicted from a simple relationship of the form:

$\text{P}{}_2\text{P}{}_1\text{=(K)}{}^{\mathrm{<mtext>h</mtext><mtext>d</mtext>}}$

where $\text{h}\text{D}$ is a function of the geometry of the compact. This has now been explored in more detail and it has been found that for PVdC and PVC the factor K is dependent on the rate of compaction and the die surface finish but is independent of compaction pressure and die diameter. To illustrate the effect of the pressure losses on the structural uniformity of the compacts, microhardness measurements were taken at a large number of points across a section of each sample. A computer plot of hardness contours provided a picture of the homogeneity of the sample which could be related to the compaction conditions and average density of the compact.     

如何发挥环境应急监测在突发环境污染事故中的作用

通过实例,阐明如何发挥环境应急监测在突发环境污染事故中的作用,重点解说环境应急监测所采用的基本原则和方法,积极应对突发环境污染事件,维护环境安全.     

压密法复混肥生产线的技术改造

在消化吸收引进法国压密法生产技术的基础上,介绍利用转鼓造粒生产技术,以55万元的投资,将压密法生产工艺改造成既可用压密法生产高浓度烤烟复混肥,又可用转鼓造粒生产外形圆整的高、中、低浓度复混肥的技术情况。已正常顺利运行3年多,共生产6.25万t中、低浓度复混肥,增加利税近312.5万元。     

Using intelligent software to predict the effects of formulation and processing parameters on roller compaction

Roll compaction is a dry, continuous granulation process, which is widely used in the pharmaceutical, chemical, metallurgical, mineral and agricultural industries to produce dust-free and free-flowing agglomerates. Intelligent software has been used to predict the relationships between tablet formulations, roll compaction process parameters and the roll compacted ribbon, from which granules for tablet manufacture can be produced. The software exploits the strengths of artificial neural networks, genetic algorithms and fuzzy logic to predict multivariate relationships from experimental data. Input data were generated from material characterisation studies and from investigations conducted on a 20 cm diameter laboratory-scale roll press with side plates, where process parameters such as roll speed (1-5 rpm), roll gap (0.5-1.4 mm) and compaction pressure (up to 230 MPa) could be manipulated. The relative significance of inputs on various outputs such as ribbon properties, nip angle and maximum roll compaction pressure was investigated using the commercially available artificial intelligence software FormRules (Intelligensys, Teeside, UK). The important inputs and required outputs were subsequently used in the model-development software INForm (Intelligensys, Teeside, UK) so that the conditions necessary to produce ribbons with specific desired properties could be predicted.     

Quasi-static confined uniaxial compaction of granular alumina and boron carbide observing the particle size effects

The quasi-static confined uniaxial compaction of granular alumina and boron carbide was studied, and the effect of triaxial stress on the materials as a function of increasing particle size was observed. The average particle sizes studied for granular alumina were 170 ± 63, 230 ± 55, 330 ± 67, and 450 ± 83 µm. The average particle size studied for granular boron carbide were 170 ± 40, 190 ± 34, 320 ± 59, and 470 ± 90 µm. The material response at hydrostatic pressure as a function of porosity, the bulk modulus as a function of hydrostatic pressure, and the transmission ratio as a function of applied load was evaluated for increasing particle size. For alumina, the increase in particle size resulted in an increase in strength for a fixed porosity, the bulk modulus of this material did not show clear particle size-dependent trends, and the transmission ratio increased with increase in particle size. Conversely, for granular boron carbide, the hydrostatic pressure-porosity curve shifted to the right with increasing particle size, the change in bulk modulus increased with increasing particle size, and no clear particle size-dependent trends were observed when looking at the transmission ratio during the experiment. Post-experiment scanning electron microscopy revealed that alumina powder fragmented from elongated shapes to block-like structures, while boron carbide powder appeared more circular before the experiments and fragmented into smaller comminuted pieces. This paper discusses the implication of the work in the context of the limited experimental data in the field and the modeling of granular advanced ceramics behavior.