Monitoring of Over Cutting Area and Lubrication Distribution in a Large Slurry Pipe Jacking Operation   总被引：1，自引：0，他引：1  

Saeid Khazaei  Hideki Shimada  Takashi Kawai  Junichi Yotsumoto  Kikuo Matsui 《Geotechnical and Geological Engineering》2006,24(3):735-755

Slurry pipe jacking was firmly established as a special method for the non-disruptive construction of the underground pipelines of sewage systems. Pipe jacking, in its traditional form, has occasionally been used for short railways, roads, rivers, and other projects. Basically the system involves the pushing or thrusting of concrete pipes into the ground by a number of jacks. In slurry pipe jacking, during the pushing process, mud slurry and lubricant are injected into the face and the over cutting area that is between the concrete pipes and the surrounding soil. Next, the slurry fills voids and the soil stabilizes due to the created slurry cake around the pipes. Fillings also reduce the jacking force or thrust during operation. When the drivage and pushing processes are finished, a mortar injection into the over cutting area is carried out in order to maintain permanent stability of the surrounding soil and the over cutting area. Successful lubrication around the pipes is extremely important in a large diameter slurry pipe jacking operation. Control of lubrication and gaps between pipes and soil can prevent hazards such as surface settlement and increases in thrust. Also, to find voids around the pipes after the jacking process, in order to inject mortar for permanent stabilizing, an investigation around the pipes is necessary. To meet these aims, this paper is concerned with the utilization of known methods such as the GPR (Ground Penetrating Radar) system and borehole camera to maintain control of the over cutting area and lubricant distribution around the pipes during a site investigation. From this point of view, experiments were carried out during a tunnel construction using one of the largest cases of slurry pipe jacking in Fujisawa city, Japan. The advantages and disadvantages of each system were clarified during the tests.  相似文献   

金属套管井中电磁测井响应的数值计算   总被引：1，自引：1，他引：1       下载免费PDF全文

沈金松  孙文博 《地球物理学进展》2007,22(6):1781-1790

分析了金属套管井中有限尺寸线圈的电磁响应特征,讨论了井眼泥浆参数、套管参数和不同线圈尺寸对电磁测井响应的影响,考察了金属套管中电磁测井对地层电阻率变化的灵敏度.径向非均匀介质的模拟计算表明,在套管井中井眼泥浆对电磁测井的影响较大,必须进行校正.在低频条件下,井间测量响应中金属套管与地层的电磁响应是非耦合的,两者可以分离.在套管参数一定时,套管响应与地层的响应的比值近似一个常数.电磁响应对地层电阻变化的灵敏度分析显示,井间电磁测量在储层研究尺度对地层电阻率变化响应灵敏,套管引起的衰减稳定.在其它参数相同的前提下,线圈直径的增大有助于有效电磁响应信号的增强,给大井间距测量提供了可能.不同磁导率金属套管的电磁响应分析表明,电磁测井中,采用非磁性或弱磁性套管要优于一般的铁磁性套管.  相似文献   

福建省数字化钻孔体应变观测资料质量初步分析     

刘水莲  李祖宁  杨颍  沈健健  黄跃进  许书元 《华南地震》2007,27(4):79-87

对整个福建省的钻孔体应变仪器运行状况进行了综合评价,并对4个台站的观测资料质量进行了分析,用M2波潮汐因子及其相对中误差等来衡量其总体精度和稳定性,还分析了钻孔应变观测的干扰机理和特征,希望能够正确地认识以及排除观测资料中的非异常信息,提高观测精度,为地震分析预报提供可靠的前兆资料。  相似文献   

SLJ-100DH型井下数字三分向力平衡加速度计装置研制     

王家行  胡振荣  马新生  尹承俊  刘阁 《地震工程与工程振动》2006,26(4):255-259

介绍了新研制的井下数字三分向力平衡加速度计装置技术性能、工作原理,分析讨论了仪器的特点。  相似文献   

Determination of Porosity and Permeability out of Dispersion Analyses of Borehole Wall Displacements     

Michael Albrecht  Vladimir Mansurov 《Pure and Applied Geophysics》2006,163(10):2125-2140

Waves carried in the borehole can be measured by the use of controlled sources inside the borehole and receivers located in the same borehole as well. This article gives the theoretical background and develops a new method to determine rock-physical parameters out of such controlled measurements of waves carried inside the borehole. Theoretical dispersion curves of the group velocities are matched to dispersion analyses of registrations obtained in the borehole. This inversion process intends to determine the in situ porosity and permeability of the rock.  相似文献   

A comparative study of geothermal and meteorological records of climate change in Kamchatka     

V. Čermák  J. Šafanda  L. Bodri  M. Yamano  E. Gordeev 《Studia Geophysica et Geodaetica》2006,50(4):675-695

To reconstruct the recent climate history in Kamchatka, a series of repeated precise temperature logs were performed in a number of boreholes located in a broad east-west strip (between 52 and 54°N) in the central part of Kamchatka west of Petropavlovsk-Kamchatski. Within three years more than 30 temperature logs were performed in 10 holes (one up to six logs per hole) to the depth of up to 400 metres. Measured temperature gradients varied in a broad interval 0 to 60 mK/m and in some holes a sizeable variation in the subsurface temperatures due to advective heat transport by underground water was observed. Measured data were compared with older temperature profiles obtained in the early eighties by Sugrobov and Yanovsky (1993). Even when older data are of poorer precision (accuracy of about 0.1 K), they presented valuable information of the subsurface temperature conditions existing 20–25 years ago. Borehole observations and the inverted ground surface temperature histories (GSTHs) used for the paleoclimate reconstruction were complemented with a detailed survey of meteorological data. Namely, the long-term surface air temperature (SAT) and precipitation records from Petropavlovsk station (in operation since 1890) were used together with similar data from a number of local subsidiary meteo-stations operating in Central Kamchatka since 1950. Regardless of extreme complexity of the local meteorological/climate conditions, diversity of borehole sites and calibration of measuring devices used during the whole campaign, the results of the climate reconstruction supported a general warming of about 1 K characteristic for the 20th century, which followed an inexpressive cooler period typical for the most of the 19th century. In the last three to four decades the warming rate has been locally increasing up to 0.02 K/year. It was also shown that the snow cover played a dominant role in the penetration of the climate “signal” to depth and could considerably smooth down the subsurface response to the changes occurred on the surface.  相似文献   

泥晶灰岩地层孔壁坍塌掉块现象及处理          下载免费PDF全文

杜金云 《探矿工程》2006,33(8):51-52

在灰岩地区钻探施工过程中，常见孔壁坍塌、掉块现象，尤其在含泥晶灰岩地层分布区钻进过程中，这种现象尤为突出，轻则影响钻探施工效率，重则造成钻探孔内事故。针对孔内坍塌、掉块现象的征兆及特点，提出了相对应的处理办法。  相似文献   

CL植物胶复合无固相冲洗液在复杂地层绳索取心钻进中的应用与研究     

唐进军  黄贡生 《探矿工程》2007,34(11):25-29

为满足复杂地层绳索取心钻探技术的需要,寻找、配制了既能代替泥浆具有良好的护壁堵漏性能,又能满足绳索取心钻进技术要求的CL植物胶复合无固相冲洗液。详细介绍了CL植物胶复合无固相冲洗液的配方和配制工艺、性能指标测试与评价、护壁机理认识及应用效果。  相似文献   

温州世贸中心大厦超深大直径钻孔灌注桩施工技术     

杨德才 《探矿工程》2007,34(1):27-29

介绍了温州世贸中心大厦120m超深大直径钻孔灌注桩的施工技术，针对超深大直径钻孔灌注桩施工中极易引起的钻进孔斜、卡钻、垮孔、堵管等问题，提出了相应的处理措施。  相似文献   

抽放瓦斯定向钻孔施工技术的研究   总被引：3，自引：0，他引：3  

郝世俊 《探矿工程》2003,30(4):50-52

介绍了抽放瓦斯定向钻孔施工技术的主要设备、钻具及仪器，组合钻具及钻进工艺参数，并通过几个工程实例，说明了该项技术的应用效果。  相似文献