PDF《水气分离技术中排水管路真空压力分布规律》

Distribution rule of vacuum pressure of drain line in water-gas separation technology ZHUGE Ai-jun1,2,3 , LI Biao4 (1.

CCCC Tianjin Port Engineering Institute Co., Ltd., Tianjin 300222, China;

2. Key Laboratory of Port Geotechnical Engineering of Ministry of Communication, Tianjin 300222, China;

3. Key Laboratory of Geotechnical Engineering of Tianjin, Tianjin 300222,China;

4. CCCC First Harbor Consultants Co., Ltd., Tianjin 300222, China) Abstract:At present, the research on vacuum preloading negative pressure distribution mainly focuses on the attenuation of vacuum pressure in vertical drainage panels, and the transfer law of vacuum pressure in horizontal drainage channels is often ignored. Based on the monitoring of vacuum pressure transfer in blind pipes and filter pipes in vacuum preloading zone with water -gas separation process, the loss of vacuum pressure in horizontal drainage channel is studied. According to the requirements of the code, some suggestions are put forward for the layout of water-gas separation tank and horizontal drainage channel in water-gas separation vacuum preloading. In the construction process of water-gas separation vacuum preloading, the vacuum pressure decreases with the increase of the length of the blind pipe, and the vacuum pressure loss in the early stage of vacuum pumping is larger, showing a non-linear decline;

the vacuum pressure loss in the later stage of vacuum pumping is slightly smaller and approximately linear decline;

the change of the cross-section area of the blind pipe has little effect on the vacuum pressure loss in the filter tube;

when the vacuum preloading treatment of water-gas separation type is used in soft soil foundation, the distance between the water-gas separator and the edge of the reinforcement area should not be greater than

55 m. Taking a

100 m伊200 m reinforcement area as an example,

4 water-gas separator tanks should be arranged to ensure that the end pressure can meet the requirements of the code. Key words:water-gas separation technology;

vacuum preloading;

drainage pipeline;

vacuum pressure transfer 摘要:目前对真空预压负压分布规律研究主要集中在竖向排水板内的真空压力衰减,真空压力在水平排水通道内 的传递规律往往被忽视.通过对采用水气分离工艺的真空预压区内盲管和滤管中的真空压力传递规律的监测,研究 了真空压力在水平排水通道内的损失情况,并结合规范要求,针对采用水气分离式真空预压中水气分离罐及水平排 水通道布设方式提出了建议.采用水气分离式真空预压施工过程中,真空压力随着盲管长度的增大而降低,抽真空 前期真空压力损耗较大,呈非线性递减;

抽真空后期真空压力损耗略小,且大致呈线性递减;

盲管截面积的改变对 滤管中真空压力的损失影响不大;

在采用水气分离式真空预压处理软土地基时,水气分离罐距加固区边缘的距离不 宜大于

55 m,以1个100 m伊200 m 的加固区为例,宜布置

4 个水气分离罐,才能保证末端压力能够满足规范的要求. 关键词:水气分离技术;

真空预压;

排水管路;

真空压力传递 中图分类号:U655.544.4;

TU472.33 文献标志码:A 文章编号:2095-7874 (2019) 04-0027-06 doi: 10.7640/zggwjs201904006 水气分离技术中排水管路真空压力分布规律 诸葛爱军 1, 2,

3 ,李彪

4 (1. 中交天津港湾工程研究院有限公司,天津 300222;

2. 港口岩土工程技术交通行业重点实验室,天津 300222;