【作者】 陈昌禄；

【导师】 郭增玉；

【作者基本信息】 西安理工大学 ， 岩土工程， 2004， 硕士

【摘要】 随着高层建筑、地铁、长大隧道等工程的发展，降低地下水位的问题日益突出。在基坑降水中，垂直井点降水技术是目前广泛采用的一类降水技术。水平井技术，又称辐射井技术，是在降水场地设置集水竖井，于竖井中的不同深度和方向打上水平井点，使地下水通过水平井点流入集水竖井中，再用水泵将水抽出，以达到降低地下水的目的。工程实践表明，水平降水有较高的效率。 首先对渗流基本理论做了较全面的回顾；对有限单元法在渗流方面的应用做了较系统的研究。其次建立了水平单井在基坑降水中的数学模型并编制了三维有限元计算程序。用理想模型和工程实际对模型进行计算分析和对比，得出了水平单井在基坑降水中的一些基本规律。 水平井流的新模型及模拟方法就渗流问题而言，水平井的进水井壁是其边界，因为井管内的水流已不是渗流。但是水平井井壁处的水力条件(边界条件)很难严格给定。然而若将其边界移至水平井的出水口处，则此处的边界条件却十分易于确定。 三维问题中，抽水竖井的处理是一个难点。本文将抽水井当作一个与圆筒轴长相同的等效方形简单元来处理。此程序可以模拟单井抽水时计算区域各点水位降深随时间的变化，研究水流运动规律；求解任意边界条件下的井定流量抽水问题，预测潜水位，指导施工开挖进度，评价降水方案的合理性。更多还原

【Abstract】 Along with the developments of skyscraper, subwsty, long tunnel, etc. The problem that lower the underground water level is increasingly outstanding. During the hole precipitation of the base, The precipitation technology of the perpendicular well is a kind of precipitation technology that is adopted extensively at present. Horizontal well technology, have another name called the well technology of radiation, sets up perpendicular well in the precipitation place, And direction horizontal well in the different degrees of depths of perpendicular well, make groundwater pass the horizontal well to flow into the collect water perpendicular well, Take water out with the water pump again, in order to achieve the goal of reducing the groundwater. The project practice indicates, there is relatively high efficiency in horizontal precipitation.Have done relatively overall retrospect to the basic theory of the influent at first; Have done relatively systematic research to the application of Finite element in influent of seepage. Secondly set up the well mathematics model during the hole precipitation of the base of horizontal well and worked out the three-dimensional finite element calculation procedure. Carry on computational analysis and compare the model with actually with ideal model and project, Have drawn some basic laws during the hole precipitation of the base of well of horizontal well.And as regards seepage question, the boundary of horizontal well is its borehole wall. The rivers in because the well is in charge of has not already been the seepage. But in the horizontal well borehole wall, the hydraulic condttions(boundary conditions) is very difficult to rigorously enforce the setting. But if move at to produce water mouthfuls of place horizontal wells, then here very much easy to determine the boundary conditions.In the three-dimensional question, the treatment drawing water in the shaft is a difficult point. This texts regards the shaft as one well unit equivalent square length of the drum. This procedure can imitate the single well pumps water the chronometer calculates at all point water level in district declines deep with horary variety; Study the sport law of the rivers; solve definitely flow draw water issue wanton boundary the wells of termses, predict that dives under water in the location, Guide and construct and excavate the progress, appraise the rationality of the precipitation scheme.更多还原