压气条件下泥膜进气值测量试验研究

王超; 朱伟; 闵凡路; 钱勇进

doi:10.3973/j.issn.2096-4498.2019.04.013

隧道建设 >

2019 , Vol. 39 >Issue 4: 626 - 632

DOI: https://doi.org/10.3973/j.issn.2096-4498.2019.04.013

研究与探索

压气条件下泥膜进气值测量试验研究

王超 ,
朱伟 ,
闵凡路 ,
钱勇进

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(1. 河海大学岩土力学与堤坝工程教育部重点实验室，江苏南京 210098；  2. 河海大学土木与交通学院，江苏南京 210098; 3. 河海大学环境学院，江苏南京 210098）

王超（1994—），男，江苏宜兴人，河海大学岩土工程专业在读硕士，研究方向为岩土工程及盾构隧道。Email： hhuwqs@163.com。

收稿日期: 2018-08-01

修回日期: 2018-10-10

网络出版日期: 2019-05-01

基金资助

国家重点基础研究发展计划(973 计划)(2015CB057803)；国家自然科学基金项目(51408191)

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Measuring Test for Airentry Value of Filter Cake under Air Pressure

WANG Chao ,
ZHU Wei ,
MIN Fanlu ,
QIAN Yongjin

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(1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, Jiangsu, China; 2. College of Civil and Transportation, Hohai University, Nanjing 210098, Jiangsu, China; 3. College of Environment， Hohai University， Nanjing 210098, Jiangsu, China)

Received date: 2018-08-01

Revised date: 2018-10-10

Online published: 2019-05-01

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摘要

在压气条件下，进气是泥膜透气失效的起始点。为测量并研究泥膜在气压下的进气压力值（进气值），通过自制的试验装置，在不同压气条件下对3种泥膜进行进气值测量试验。试验结果表明： 1)由闭气排水与固结排水的差值可以辨别泥膜是否进气，得到泥膜进气值； 2)采用泥膜特征孔径D90/2代入推导公式可近似计算泥膜进气值； 3)泥膜在不同压气条件下进气值不同，增压速率越低，泥膜进气值越大； 4)在较快和较慢的增压速率下存在进气值变化趋于稳定的现象，最大进气值为最小值的2倍以上。

关键词： 压气条件; 泥水盾构; 泥膜; 进气值; 测量试验; 增压速率

本文引用格式

王超 , 朱伟 , 闵凡路 , 钱勇进 . 压气条件下泥膜进气值测量试验研究[J]. 隧道建设, 2019 , 39(4) : 626 -632 . DOI: 10.3973/j.issn.2096-4498.2019.04.013

Abstract

Under air pressure, air inflow is the starting point for the failure of filter cake. In order to measure and study airentry value(AEV) of filter cake under air pressure, through selfmade test device, the measurement of the AEV of three kinds of filter cakes under different pressure conditions is carried out. The results show that: (1) The difference value between airclosed draining and consolidation drainage can be used to distinguish whether air inflow happens or not, and AEV of filter cake can be obtained.(2) AEV can be approximately calculated by substituting the characteristic pore diameter D90/2 into the derivation formula. (3) AEV of filter cake is different under different air pressure conditions, the lower the rate of pressurization, the larger the AEV is. (4)The change of AEV at a faster and slower rate of pressurization rate tends to be stable, the maximum AEV is more than two times the minimum.

Key words： air pressure; slurry shield; filter cake; airentry value(AEV); measuring test; rate of pressurization

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