首页期刊在线 2022年（第25卷）第8期

砂-黏混合地层渣土改良及膨润土泥浆掺入规律研究

董敏琪1陈志敏1,2黄峰3肖瑞传3张会东3彭洪秋3

Study on Mixing Law of Residue Improvement and Bentonite Incorporation in Sand-clay Mixed Formation Stratum

DONG MinqiCHEN ZhiminHUANG FengXIAO RuichuanZHANG HuidongPENG Hongqiu

作者信息:

1.1.兰州交通大学土木工程学院， 730070，兰州；
2.2.兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室， 730070，兰州；
3.3.广州地铁集团有限公司， 511430，广州
Affiliation:

School of Civil Engineering, Lanzhou Jiaotong University, 730070, Lanzhou, China
关键词:

地铁;渣土改良;砂-黏混合地层;膨润土泥浆掺入
Key words:

metro;residue improvement;sand-clay mixed formation;bentonite slurry mixing
DOI:

10.16037/j.1007-869x.2022.08.023
中图分类号/CLCN:

U455.43
栏目/Col:

研究报告

摘要:

通过试验对钙剂膨润土和钠基膨润土进行比选，选择泥浆质量分数为10%，膨化时间为24 h的钠基膨润土作为渣土改良剂。以广州地铁21号线为例，针对砂-黏混合地层的特点，通过含砂率梯度及含水率梯度的土样集，得到多种工况下的改良剂最优掺入比，进一步总结了钠基膨润土泥浆掺入比随地层含砂率及含水率变化的掺入规律，并拟合得到了三者的函数关系。

Abstracts:

Calcium bentonite and sodium bentonite are compared and selected through tests. The slurry mass fraction is chosen to be 10%, and the sodium bentonite of 24 h expansion time is chosen as residue modifier. Taking Guangzhou Metro Line 21 as an example, targeting the sand-clay mixed formation stratum characteristics, through the soil sample set of sand content gradient and water content gradient, the optimal proportion of residue modifier under various working conditions is obtained. The mixing law of sodium bentonite slurry ratio with the change of sand content and water content in the formation is further summarized, and the function is fit to obtain functional relationship of the three.