管井降水中出水含砂量的影响因素探讨

含砂量是衡量基坑降水效果的一个重要指标,降水井的出水含砂量大,会造成地面不均匀沉降,对周边环境产生影响。国内外对含砂量的影响因素研究不多,很多结论是基于现场经验总结出来的,很少有定量的研究。通过现场试验,以太原地铁2号线嘉节站群井抽水试验30天中采集的水样测得的含砂量数据为基础,从滤网类型、滤料、井管、取样时间和降水井实时出水量五个方面分析了其对含砂量的影响。发现滤网类型和滤料对含砂量的影响较大,且使用100目纱网+棕滤网得到的含砂量数据较为稳定,而不同井管类型对含砂量的影响不太明显。得到的结论,为相似地层深基坑管井降水的含砂量控制提供参考。

Study on Factors Affecting Sand Content inWell Dewatering

Sand content is an important indicator to measure the effect of well dewatering. The effluent of the precipitation well has a large amount of sand, which will cause uneven settlement of the ground and affect the surrounding environment. There are not many researches on the influencing factors of sand content at home and abroad. Many conclusions are based on field experience, and there are few quantitative studies. Based on the field test, based on the sand content data measured in the water sample collected during the 30-day pumping test of the Jiajie station group well of Taiyuan Metro Line 2, the real-time water output from the filter type, sampling time, filter material, well pipe and precipitation well five aspects analyzed its impact on sand content. It is found that the filter type and the filter material have a great influence on the sand content, and the sand content data obtained by using the 100 mesh gauze and brown filter is relatively stable, and the influence of different well pipes on the sand content is not obvious. The conclusions obtained provide a reference for the sand control of precipitation in deep well pits in similar formations.