对穿越河流管道压力灌浆加固

通过对穿越河流的管道进行压力灌浆加固机理的论述，阐明了灌浆加固有关参数的确定方法，提出了相应的施工工艺、灌浆效果的评价及其检测方法，同时指出了施工技术要求，对穿越河流的管道加固工程作了有益的尝试。     

花管注浆加固松散碎石土层试验与效果参数预测模型

注浆技术可用来加固松散碎石土层,以提高其防渗与承载能力。该文以渗透注浆工作原理与注浆花管技术为基础,开展了加固松散碎石土层注浆试验研究;并依据数值分析方法与Minitab 16软件,探讨了注浆加固松散碎石土层注浆量、扩散半径、扩散高度及结石体抗压强度等效果参数预测模型;同时设计试验进行了验证。研究结果表明:1)相邻注浆孔流出的浆液在松散碎石土层中相容,且侧边与底部注浆孔流出的水泥浆液在松散碎石土层渗透扩散时产生了明显的群效应,从而形成一个整体近似呈圆柱形的注浆结石体;2)由这些模型计算得到的注浆量实测值大于预测值,而扩散半径、扩散高度及结石体抗压强度的实测值都小于预测值,但均相差不大,其相对误差分别在9%、7%、6%与6%左右变动。因此,该文构建模型可作为采用注浆技术加固松散碎石土层的注浆量、扩散半径、扩散高度及结石体抗压强度等效果参数的设计基础。研究成果可为碎石土地质灾害的防灾减灾提供一定的理论参考。     

滑坡堆积体防渗设计及实施对策

在滑坡堆积体和复杂地质结构上建造防渗体。防渗体上游为湖相沉积软基,左右两岸存在滑坡及不稳定山体,并且库区内雨量充沛,年平均降雨量达1 640mm。考虑防渗体在不同工况下,对大坝典型断面渗流进行计算及评判。水库汛期实施及地下水位雍高等不利条件下,通过调整设计,改进施工工艺,有效提高施工质量,减少不安全因素,在设计和施工对策方面为类似地质结构和施工条件做出有益的探索。     

旱地地膜冬小麦籽粒灌浆特性研究

旱地冬小麦地膜覆盖穴播栽培技术在灌浆特性及干物质运转方面主要表现是:灌浆持续天数延长3～5d,单茎总绿叶面积及生物产量提高,合成源扩大。同时表现出了较高的移动量和转换率。     

压浆技术在处理台背填土中的应用

在密山市方虎公路的几座桥梁工程中,运用注浆技术对台背填土进行固结处理,取得了较好的效果。文中主要介绍了注浆技术的各个主要技术参数、施工工艺和质量控制等。     

Climb Height and Overflow of Grout in Shaft Base Grouting

Based on the assumptions of exponential fluid and narrow plate model, formulas for calculating the climb height of grout in shaft base post grouting was deduced. It is shown that the climb height of grout is mainly related to the grouting pressure, the shaft length, the shaft diameter and the mudcake thickness. With the theoretic analysis and case study, it is indicated that thicker mudcake, higher grouting pressure and shorter shaft length would lead to larger climb height and larger risk of overflow. The overflow of grout would be prevented by reducing the grouting pressure, the mudcake thickness and debris thickness. The overflow of grout can also be prevented by increasing the strength of mudcake. For the overflow shafts, intermission grouting would be employed. Compared with the ordinary shafts, the former has higher bearing capacity than the latter, resulting from the grout upwards along the shaft soil interface.     

酸刺沟隧道出口水平旋喷桩施工技术

主要介绍水平旋喷桩在隧道软弱围岩中施工工艺及加固效果的应用。酸刺沟煤矿铁路专用线隧道出口施工时,经现场核实均与设计图纸相符,泥岩与粘性土经地下水长期浸泡饱和后形成稳定性极差的软塑-流塑状地层,即形成泥岩与粘土的互化层,隧道在开挖施工中极易滑坍。为解决通过这种隧道地质的施工方法,保证隧道永久质量和施工中的安全,采取新工艺、新材料和新方法,着重考虑隧道超前预加固,通过对超前小导管、超前小导管预注浆、大管棚、深孔注浆、水平旋喷桩、水平搅拌桩和水平固结等方案比选,决定采取水平旋喷桩施工技术,主要研究软弱围岩隧道施工中如何应用水平旋喷桩,初步拟选桩直径、桩长、外插角和循环距离等技术参数,通过现场施工,顺利通过该隧道软弱围岩段,在该隧道软弱围岩段成功地应用了水平旋喷桩,值得推广和借鉴。     

Deformation Properties of Backfill Grouting in Shield Tunnel

Utilizing the self made unit body model test apparatus, the deformation laws of backfill grouting were studied under different grouting pressures, different soil conditions and different ground water pressures. It was shown that high grout pressures can accelerate the consolidation rate of grout drainage and increase final deformation amount. And soil permeability coefficient was an important factor to grout deformation. The ground water pressure was more important for sand soil while the grout pressure was for clay soil. The proposed apparatus can truly reflect stress status of grout injected to tail void. And grout deformation properties were helpful to clarify the stratum stress release and stratum deformation of backfill grouting.      

Bolt shotcrete support and small pipe groutingtechnology used in treating tunnel collapse

Bolt shotcrete support and small pipe grouting technology are two important elements in the new Austrian tunneling method. We explore the application of bolt shotcrete support and small pipe grouting technology in treating the Huanshanping Span Tunnel col     

标准海塘白蚁综合治理

为了探求海塘白蚁综合治理和治理效果检测的方法和措施,结合标准海塘的白蚁治理进行了应用研究。结果表明,在50 kPa压力条件下,药物灌浆的有效渗透范围可达1 m以上,通过药物灌浆不仅可充填海塘内的空隙,同时可基本杀灭海塘内原有的白蚁巢群,并在海塘内形成连续的药土屏障。通过同物质同条件的检验孔灌浆,可检测药物灌浆的充填程度;通过白蚁的检查与杀灭,可检测药物灌浆对海塘白蚁的杀灭效果,同时可杀灭海塘内残留的巢群。表3参7