两次插板和两阶段真空预压模型试验对比研究

吴建奇; 欧阳财禄; 符洪涛; 许士伟; 吕有畅

doi:10.13204/j.gyjzG21090606

两次插板和两阶段真空预压模型试验对比研究

doi: 10.13204/j.gyjzG21090606

1. 江西理工大学土木与测绘工程学院, 江西赣州 341000;
2. 温州大学建筑与土木工程学院,浙江省软弱土地基与海涂围垦重点实验室, 浙江温州 325035;
3. 温州市瓯飞开发建设投资集团有限公司, 浙江温州 325035

基金项目:

国家自然科学基金项目(51768025,51878402)。

详细信息

作者简介:
吴建奇,男,1980年出生,硕士,副教授,wujq1980@jxust.edu.cn。

通讯作者:
符洪涛,男,1987年出生,博士,教授,fuhongtao2012@163.com。

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出版历程
- 收稿日期: 2021-09-06
- 网络出版日期: 2023-05-25
- 刊出日期: 2023-01-20

Comparisons of Model Tests Between Vacuum Preloading on Twice Setting of Prefabricated Vertical Drains and Two-Stage Zonal Vacuum Preloading on Prefabricated Vertical Drains

1. School of Architectural and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. College of Architecture Engineering,Wenzhou University, Key Laboratory of Soft Soil Foundation and Engineering Technology of Zhejiang Province, Wenzhou 325035, China;
3. Wenzhou Oufei Development and Construction Investment Group Co., Ltd., Wenzhou 325024, China

摘要

摘要: 为解决真空预压联合竖向排水板处理软土地基过程中,竖向排水板容易发生淤堵导致土体加固效果很差,土体产生不均匀固结的问题,进行了两次插板和两阶段真空预压模型对比试验。通过比较采用两种方法加固后土体的沉降、十字板抗剪强度、含水率等指标,探究两种方法对软土地基的改良效果。试验结果表明:两次插板真空预压试验的最大沉降为208 mm,两阶段真空预压试验的最大沉降只有170 mm;试验结束后,两次插板和两阶段真空预压的平均十字板抗剪强度分别是29.5, 24.75 kPa。表明两次插板真空预压处理超软土效果比两阶段真空预压更好。
- 真空预压 /
- 两次插板 /
- 两阶段抽真空 /
- 不均匀固结 /
- 塑料板水板
Abstract: In order to solve the problem that prefabricated vertical drains (PVDs) are prone to be silted and lead to poor soil reinforcement effect and non-uniform consolidation in the process of treating soft soil by vacuum preloading with prefabricated vertical drains, a comparative model test between vacuum preloading on twice setting of prefabricated vertical drains and two-stage zonal vacuum preloading on prefabricated vertical drains was conducted. By comparing the indexes of site soil involving subsidence, cross-plate vane shear strength and the water content treated by the above two methods, the improvement effect of the two methods was explored. The test results showed that the maximum subsidence of vacuum preloading on twice setting of prefabricated vertical drains and two-stage zonal vacuum preloading on prefabricated vertical drains was 208 mm and 170 mm respectively; the average cross-plate vane shear strength of soil improved by the two methods were 29.5 kPa and 24.75 kPa respectively. It showed that the improvement effect of vacuum preloading by twice setting of prefabricated vertical drains on ultrasoft soil was better than that by two-stage zonal vacuum preloading on prefabricated vertical drains.

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参考文献(18)

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