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在简要介绍预选区水文地质条件基础上,主要通过压水试验、抽水试验等水文地质试验得出各种水文地质参数从而分析预选区含水介质渗透性变化特征以及地层渗透性变化规律。 相似文献
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蒋才俊 《水文地质工程地质》1982,(1)
捷克斯洛伐克水文地质考察组应地质部的邀请,于不久前在北京市水文地质工程地质公司考察了北京水文地质土作。他们详细考察了北京水文地质测绘、地球物理地面与测井勘探、水文地质钻探、抽水试验、地下水动态观测和地下水资源评价等项水文地质勘察工作方法,参观了各种水文钻井设备、地下水均衡试 相似文献
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蒋辉 《水文地质工程地质》2011,38(2):35-38
抽水试验是水文地质勘查中最常用的水文地质试验,通过抽水试验,可准确计算水文地质参数。本文根据在河南豫东地区进行的抽水试验,分别用AquiferTest软件计算抽水试验参数和人工求参,进而进行对比分析得出:传统的人工求参,计算结果较为准确,可靠,但因人而异,有不唯一性;用AquiferTest软件计算抽水试验参数,规范、可比性好。本文最后还对参数取值问题进行了分析对比。 相似文献
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基于井下放水试验的矿井疏降量预测评价 总被引:1,自引:0,他引:1
井下放水试验作为特殊的水文地质试验,克服了地面抽水试验存在的不利条件,有着十分重要的实践和理论意义。为了探查双柳煤矿太原组灰岩含水层的水文地质条件,通过两次井下放水试验取得的相关水文地质参数,控制了太灰含水层的动态流场。基于井下放水试验取得的水文地质条件信息,利用Visual MODFLOW三维数值模拟软件,建立放水试验期间反映模拟区太灰地下水分布、储存及其时空变化规律的参数模型;根据拟定的预测方案,对太灰含水层的疏降涌水量进行预测。通过本次工作,对双柳井田下一阶段进行疏干降压,减少太灰含水层对上组煤(4#煤层)开采的威胁,同时为下组煤(8+9#煤)开采提供疏降方式和水文地质依据。 相似文献
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为丰富青藏高原冈底斯成矿带水文地质研究内容,从钻孔实际揭露的地层特征出发,结合试验确定的各项水文地质参数,利用测井数据建立矿化度、孔隙度、渗透系数、单孔涌水量等水文测井解释模型,经实际测井资料数据处理及综合解释,结果表明,测井解释的各项水文地质参数与试验值吻合度高,应用效果明显。首次在青藏高原冈底斯成矿带采用测井方法建立起了第四系含水层水文地质参数评价模型,为该区水文地质勘探提供了借鉴。 相似文献
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抽水试验是确定含水层水文地质参数,了解水文地质条件的主要方法。水文地质参数计算的精度直接关系到地下水资源评价精度和对区域水文地质条件的认识程度。基于野外抽水试验数据,通过裘布依稳定井流公式法和含水层试验软件Aquifer test计算水文地质参数,将计算结果作比较,以期得到更加精确的水文地质参数。虽然裘布依稳定井流法计算简便,但对水文地质条件概化处理,使得参数计算结果与实际值相差较大;而Aquifer test软件基于严谨的非稳定流理论数学模型,求参准确性相对较高,操作方法简捷。 相似文献
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财神庙矿区在水文地质勘探评价中,总结初勘中水文地质规律,指导水文地质勘查工程;利用非探矿工程进行抽水放水试验;利用构造孔、找矿孔开展水文地质观测;实施水文地质与地质设计、钻探施工三结合的一套工作方法,实践证明,这些水文地质勘探方法是可行的,有效的,缩短了勘探工期,降低了工作成本,获得了良好地质效果和经济效益。 相似文献
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花岗岩残积土属区域性特殊土,一般具有较强的结构性,准确获得其力学参数是进行基坑等工程设计的前提条件。针对广州地区花岗岩残积土,开展系列力学特性试验研究,包括压板载荷试验、标贯试验以及室内侧限压缩、直剪等常规试验,基于试验结果得到工程中常用的花岗岩残积土力学参数,并进行对比分析及验证。结果表明,由花岗岩残积土室内直剪试验强度参数(黏聚力c、内摩擦角 )计算得到的地基极限承载力以及由室内侧限压缩试验得到的花岗岩残积土变形参数均明显小于实测值;由压板载荷试验反算得到的花岗岩残积土c、 和变形模量E50计算p-s曲线结果与实测结果较为吻合;由标贯试验结果得到的花岗岩残积土E50则与由压板载荷试验得到的E50结果接近,说明压板载荷试验、标贯试验可作为花岗岩残积土力学参数的合理确定方法之一。 相似文献
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陇东盆地水资源短缺,严重制约着经济发展,近年来探明白垩系洛河组地层赋存巨厚深层地下淡水。含水层水文地质参数的求解是深层地下水资源评价的关键,用抽水试验确定深层承压含水层水文地质参数是水文地质勘查研究的一项重要的内容。根据单孔、多孔、干扰抽水试验资料,采用稳定流、非稳定流多种方法求解陇东盆地深层含水层水文地质参数,避免了单一方法的偶然性、随意性,计算结果可信。最后探讨了抽水试验场地水文地质条件与所选取公式理论条件的差异对计算结果的影响。 相似文献
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对杨家坪煤炭采空区主要岩层进行了较系统的试验研究,包括岩体结构的野外调查、岩块与结构面室内试验及岩体力学参数经验估算,岩体结构面网络模拟等。对各种试验数据进行了分析整理,得到了岩块、结构面的物理力学性质参数。并用岩体工程分类及Hoek-Brown经验方法对各类岩体的力学参数进行了估算。在分析对比基础上,考虑了岩体所处地质条件,给出了各种岩体的计算参数建议值。有限元计算结果表明,建议参数值能较好地反映采空区岩体的力学性质。 相似文献
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论述了钻机性能参数测试台模糊控制的理论基础;介绍了坑道钻机检测检验试验台测控模糊控制系统的原理、组成、性能指标、测试参数、抗干扰设计以及运行情况;分析了钻探测控模糊控制应用技术的发展前景。 相似文献
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Matrix-diffusion parameters deduced from an infiltration tracer test at Idaho National Laboratory (INL), USA, are combined with other site information in an analysis involving two dimensionless lumped parameters to assess the effects of matrix diffusion on contaminant transport at the INL over longer distance and time scales than were evaluated in the test. Matrix diffusion was interrogated in the test by comparing, in three different observation wells, the breakthrough curves of two simultaneously injected nonsorbing solutes that have different diffusion coefficients. The matrix-diffusion parameters deduced from the different breakthrough curves were in good agreement, suggesting that the parameters may be broadly applicable at the INL. With this in mind, the uncertainties in the individual parameters that make up the two lumped parameters were estimated, and the resulting ranges of parameter values were used to assess matrix diffusion over larger scales. Assessments of the effects of flow transients, spatial heterogeneity in transport parameters, and sorption on solute transport in the shallow subsurface flow system were also conducted. The methods presented here should be generally applicable to other settings for making bounding assessments of the effects of matrix diffusion while honoring the information obtained from tracer tests and other supporting data. 相似文献
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The aim of this paper is to present a methodology for identifying the soil parameters controlling the delayed behaviour from laboratory and in situ pressuremeter tests by using an elasto‐viscoplastic model (EVP‐MCC) based on Perzyna's overstress theory and on the elasto‐plastic Modified Cam Clay model. The influence of both the model parameters and the soil permeability was studied under the loading condition of pressuremeter tests by coupling the proposed model equations with Biot's consolidation theory. On the basis of the parametric study, a methodology for identifying model parameters and soil permeability by inverse analysis from three levels of constant strain rate pressuremeter tests was then proposed and applied on tests performed on natural Saint‐Herblain clay. The methodology was validated by comparing the optimized values of soil parameters and the values of the same parameters obtained from laboratory test results, and also by using the identified parameters to simulate other tests on the same samples. The analysis of the drainage condition and the strain rate effect during a pressuremeter test demonstrated the coupled influence of consolidation and viscous effects on the test results. The numerical results also showed that the inverse analysis procedure could successfully determine the parameters controlling the time‐dependent soil behaviour. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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Field injectivity tests are widely used in the oil and gas industry to obtain key formation characteristics. The prevailing approaches for injectivity test interpretation rely on traditional analytical models. A number of parameters may affect the test results and lead to interpretation difficulties. Understanding their impacts on pressure response and fracture geometry of the test is essential for accurate test interpretation. In this work, a coupled flow and geomechanics model is developed for numerical simulation of field injectivity tests. The coupled model combines a cohesive zone model for simulating fluid-driven fracture and a poro-elastic/plastic model for simulating formation behavior. The model can capture fracture propagation, fluid flow within the fracture and formation, deformation of the formation, and evolution of pore pressure and stress around the wellbore and fracture during the tests. Numerical simulations are carried out to investigate the impacts of a multitude of parameters on test behaviors. The parameters include rock permeability, the leak-off coefficient of the fracture, rock stiffness, rock toughness, rock strength, plasticity deformation, and injection rate. The sensitivity of pressure response and fracture geometry on each parameter is reported and discussed. The coupled flow and geomechanics model provides additional advantages in the understanding of the fundamental mechanisms of field injectivity tests. 相似文献
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精确地评价土的力学性质,提供可信赖的设计参数,对基础工程设计具有重要的现实意义。现有的试验方法中,土的强度和变形参数由精度相异的不同试验方法得出,并且不可避免地存在不同程度地扰动土体,释放土中应力。研制的自钻式原位剪切旁压试验方法(self-boring in-situ shear pressuremeter test)。结合常规的旁压试验和室内直剪试验之长,采用自钻式钻进,将测定器插入到预定深度,尽可能地减少土体的扰动,较好地保持了土中的原始应力;其独特的结构和加加载方式使该方法能够同时直接测出土的强度和变形参数,还能获得土的静止土压力 、剪切反力系数 ,评价桩周摩擦力 等力学参数。由于它是一种在钻孔内的测试技术,所以能获得不同深度土的力学参数。 相似文献