The utility model discloses a test device for simulating the sand bursting and sinking of a caisson, which comprises a model box. The front side and rear side of the side wall of the caisson are respectively vertically connected to the front and rear sides of the model box through slide rails with rollers; the bottom of the model box is filled with earth, and the filled earth is also provided with multi-layer colored sand and multiple earth pressure boxes; the upper part of the side wall of the caisson is also connected with a loading device; the caisson The side wall divides the upper part of the filling soil of the model box into two parts: the left part is filled with sand from the bottom to the top, which is also equipped with multi-layer colored sand and multiple pore water pressure gauges; the left and right sides of the side wall of the caisson are also equipped with electric control one-way valve water tanks. The device is used to carry out the simulation test of sand bursting and sinking in open caisson. By controlling the water level difference between the inner and outer sides of the shaft wall, the open caisson will be subject to sand bursting and sinking. The water level difference between the inner and outer sides, the sudden sinking rate and the sudden sinking amount will be determined during sand bursting and sinking in open caisson. The relationship between the seepage force, end resistance and side friction resistance before and after sand bursting and sinking will be studied, and the influence scope and channel of sand bursting will be determined.
【技术实现步骤摘要】
一种模拟沉井发生翻砂突沉的试验装置
本技术涉及土木建筑行业中沉井基础
,特别是一种模拟沉井发生翻砂突沉的试验装置。
技术介绍
随着国民经济建设逐步稳定地发展,基础建设项目日益增多,各类工程建设规模也日益扩大,重大项目包括高耸建筑大跨度结构、地下洞室群、深大基础、高坝、海洋工程等日益增多,他们的共同特点是施工规模大、范围广、周期长、过程复杂。沉井作为一种地基基础,其特点是刚度大、承载力高、抗渗耐久性好,内部空间可利用,可在很大深度地下工程及复杂地形和地质条件下施工,目前已广泛利用于各领域。在复杂多变的地层中实施沉井,由于不同土层间承载能力差异较大、摩擦系数多变等特性,极易产生突沉、翻砂和超沉,沉井下沉的速度和方向极难控制。为了揭示沉井下沉中翻砂突沉的机理,建立翻砂突沉的计算模型,怎样使得沉井模型发生翻砂突沉,并且再现原型应力场,这是至今尚未能够很好解决的试验难题。
技术实现思路
为了克服上述问题,在原型应力场下,使得沉井模型发生翻砂突沉,以便揭示沉井翻砂突沉的机理,本技术以相似原理为基础,提出了一 ...
【技术保护点】
1.一种模拟沉井发生翻砂突沉的试验装置,其特征在于,包括模型箱,模型箱的前侧面透明,前侧面外侧还设置有高速摄像机;还包括沉井侧壁,沉井侧壁的上侧边设置有位移计,下侧边设置有刃脚踏面和刃脚斜面,刃脚斜面倾角为45度,并设置有多个土压力盒;所述沉井侧壁的前侧边和后侧边分别通过带滚轮的滑轨竖直连接到模型箱的前侧面中部和后侧面中部;模型箱底部有填土,试验前填土表面与沉井侧壁的底端在同一水平线上,沉井侧壁下方的填土中还设置有多层彩砂以及多个土压力盒;沉井侧壁的上部还连接有用于试验前拉住沉井侧壁以及试验时将沉井侧壁压入下方填土中的加载装置;所述沉井侧壁将模型箱的填土上方分割为左、右两部 ...
【技术特征摘要】
1.一种模拟沉井发生翻砂突沉的试验装置,其特征在于,包括模型箱,模型箱的前侧面透明,前侧面外侧还设置有高速摄像机;还包括沉井侧壁,沉井侧壁的上侧边设置有位移计,下侧边设置有刃脚踏面和刃脚斜面,刃脚斜面倾角为45度,并设置有多个土压力盒;所述沉井侧壁的前侧边和后侧边分别通过带滚轮的滑轨竖直连接到模型箱的前侧面中部和后侧面中部;模型箱底部有填土,试验前填土表面与沉井侧壁的底端在同一水平线上,沉井侧壁下方的填土中还设置有多层彩砂以及多个土压力盒;沉井侧壁的上部还连接有用于试验前拉住沉井侧壁以及试验时将沉井侧壁压入下方填...
【专利技术属性】
技术研发人员:章露露,蒋炳楠,马建林,王蒙婷,褚晶磊,李孟豪,周和祥,张凯,罗朝洋,林大富,
申请(专利权)人:西南交通大学,
类型:新型
国别省市:四川;51
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