摘要
泥浆性能对保证地连墙施工质量与安全具有重要意义。采用正交试验分析泥浆性能指标与沉渣厚度的关系;依据泥浆性能与盐浓度的相关性,探讨高盐条件下泥浆性能的影响因素,确定施工区不同地质条件的泥浆配比。结果表明:临海侧施工区的沉渣厚度更大,沉渣达到稳定的时间也更长;泥浆密度、黏度及含砂率越大,最终沉渣厚度也越大,密度及黏度增大还会延长沉渣到达稳定的时间;泥浆密度与盐浓度呈正相关,黏度及pH值与盐浓度呈负相关;通过调节泥浆材料配比可控制泥浆性能,钠基膨润土会增大泥浆密度、黏度、含砂率及pH值,纯碱会导致泥浆密度和pH值增加,聚合氯化铝可增加泥浆密度并降低泥浆含砂率及pH值。临红海地区高盐环境下泥浆材料配比推荐值为钠基膨润土10%、纯碱掺量0.2%、聚合氯化铝0.08%、pH值为8的清水89.72%。
Mud performance is of great significance to ensure the quality and safety of underground diaphragm wall construction.Orthogonal test is used to analyze the relationship between mud performance index and sediment thickness.Based on the correlation between mud performance and salt concentration,influnce factors of mud performance under high salt conditions are discussed,suitable mud mix proportions are determined for different geological conditions in the construction area.The results show that the sediment thickness of the construction area near the sea is thicker and the time for the sediment to reach stability is longer.The greater the density,viscosity and sand content of mud are,the greater the final sediment thickness is,and the increase of density and viscosity will prolong the time for sediment to reach stability.Mud density is positively correlated with salt concentration,while viscosity and pH are negatively correlated with salt concentration.Mud performance can be controlled by adjusting the mix proportion of mud materials.Sodium bentonite will increase the mud density,viscosity,sand content and pH value,soda ash will increase the mud viscosity and pH value,and polyaluminum chloride can increase the mud density and reduce the mud sand content and pH value.In the high salt environment near the Red Sea area,the recommended mud mix proportion is 10% sodium bentonite,0.2% soda ash content,0.08% polyaluminum chloride,89.72% water with pH 8.
作者
宋庆仁
黄威
王志敏
赵紫辰
SONG Qingren;HUANG Wei;WANG Zhimin;ZHAO Zichen(The First Construction Company of CCCC Second Harbor Engineering Co.,Ltd.,Wuhan 430050,China;CCCC Second Harbor Engineering Co.,Ltd.,Wuhan 430050,China)
出处
《水运工程》
2024年第10期218-224,共7页
Port & Waterway Engineering
关键词
地连墙
护壁泥浆
质量控制
沉渣厚度
配合比
underground diaphragm wall
protection mud
quality control
sediment thickness
mix proportion
