西安地铁凤栖原车站深基坑施工降水技术研究
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摘要
研究目的:结合西安地铁2号线南延段凤栖原站降水的工程实践,介绍降水施工中的管井施工工艺,对周边重要建筑物的保护以及地下水监测及沉降监测等施工技术,为类似工程的施工提供方案支持。研究结论:降水工程的专业性强,地域性非常明显,类似工程经验非常重要。黄土夹砂地层降水,需要在充分掌握工程地质特征和水文地质条件的前提下,结合基坑形状和几何尺寸,参照本地区类似工程经验,经过经济技术比较后,选择合理降水方案。方案实施期,加强降水效果监测,及时分析、优化方案,并采取及时有效的改进措施。在基坑深度不大的西安黄土地区,基坑宽度小于20 m时,采用基坑外深井管降水即可满足降水要求;当基坑宽度大于20 m时,应采用内外结合的深井管降水。
Research purposes:Combined with the water reduction for the Fengqiyuan Station of the Line 2 of the Xi'an metro,the introductions are given to the construction technology of the pipe and well for the water reduction,the protection of the main surrounding building and the monitoring of the underground water and settlement for providing the support to similar works. Research conclusions:As the water reduction engineering is strong in speciality and obvious in territoriality,the similar experience is very important.For the water reduction in loess sand stratum,the reasonable scheme for the water reduction should be chosen after making the comparisons in economics and technology according to the engineering geological features,the shape and the size of the foundation pit and the experience of the similar work.In the course of implementing the scheme,the effect of the water reduction should be monitored to analyze and optimize the scheme timely and take more effective measures.For the small foundation pit in Xi'an loess area,the deep well and pipe outside of the foundation pit are used for the water reduction when the width of the foundation pit is less than 20 m.When the width of the foundation pit is more than 20 m,the wells and pipes inside and outside of the foundation pit should be used for the water reduction.
引文
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