Application Research on Properties of Protection Slurry for Diaphragm Retaining Wall Trenching in Soft Soil
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摘要: 含砂性土等软土地层地下连续墙成槽施工,基槽侧壁易扰动坍塌,影响地下连续墙施工质量. 降低泥浆失水量、适当提高泥浆粘度和防塌是护壁成槽的关键. 结合宁波轨道交通车站基坑地下连续墙成槽施工,采用部分水解聚丙烯酰胺(PHP)、聚丙烯腈钙(CPAN)和硝基腐植酸钾(NKHm)作为添加剂,根据正交试验测定泥浆性能优化配比. 研究表明:PHP失水量小,泥皮薄;CPAN和NKHm对降失水量效果明显,粘度适中. 将试验结果应用于工程实践,护壁效果好.Abstract: For the construction of diaphragm retaining wall trenching in sand-bearing soft soil layer, the construction quality will be affected by the collapse of side wall of trench.Water loss reducing, appropriate slurry viscosity increasing and col-lapse prevention are the key for wall protection in trenching.According to the geological conditions of a diaphragm retaining wall trenching engineering in Ningbo, partially hydrolyzed polyacrylamide (PHP), calcium polyacrylonitrile (CPAN) and potassium nitryl humate ( NKHm) were taken as additives;the optional ratio of slurry performance was ascertained by the orthogonal test.The test results show that when using PHP, the amount of water loss is small with thin mud cake; CPAN and NKHm have evident effects on fluid loss control with moderate viscosity.The test result is applied in the engineering practice and the good effect of wall protection is received.
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Key words:
- diaphragm retaining wall /
- wall protection by slurry /
- orthogonal test /
- soft soil layer
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