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一、基本情况太湖流域东部平原地区,河流纵横,小圩区数以万计。为整治该地区的洪涝灾害,需建数万座小型水闸。该地区属冲积湖积平原,经地质勘探,区域地质资料揭示拟建小型水工建筑物的地基持力层,相当一部分土质为淤积质土,属第四纪全新世中组(Q_4~2)湖积相沉积,地基允许承载力一般为5.0～6.0tf/m~2,部分甚至小于4.0tf/m~2。要在这种高压缩性、低承载力的软土地基上建闸,必须进行地基加固处理,或改变传统水闸结构设计,才能确保水闸等建筑物安全运行。轻型结构设计与计算(一)结构布置跨度3.0～5.0m的单孔水闸,工程规模小,施工单位的设备一般都很简陋,地基不宜采用机械或其它措施进行加固处理,以往多用大底板基础,以降低地基压力。但此种方法造价仍较高,效果也并不显著,如欲建筑物的基底压力降到4.0tf/m~2以下就更加
First, the basic situation The eastern plains of the Taihu Lake basin, rivers and streams, small polders tens of thousands. In order to rehabilitate the floods in the area, tens of thousands of small sluices need to be built. The area belongs to the alluvial lake plain. According to the geological exploration and regional geological data, the foundation supporting layer of the proposed small-scale hydraulic structures is revealed. A considerable part of the soil is silty soil, and belongs to the Quaternary Holocene (Q_4 ~ 2) Lake deposition, the allowable bearing capacity of the ground is generally 5.0 ~ 6.0tf / m ~ 2, some even less than 4.0tf / m ~ 2. To build a gate on such high compressibility and low bearing soft soil foundation, it is necessary to carry out foundation reinforcement treatment or change the design of the traditional sluice structure so as to ensure the safe operation of the sluice and other buildings. Lightweight structure design and calculation (I) Structural arrangement A single-hole sluice with a span of 3.0-5.0m has a small scale of construction. The equipment of the construction unit is generally very simple. The foundation should not be reinforced by mechanical or other measures. In the past, To reduce the foundation pressure. However, this method is still costly, the effect is not significant, if the building’s base pressure dropped to 4.0tf / m ~ 2 even more