基于生物酶的固土技术在香港的应用研究

发布时间：2019-04-26 06:07

【摘要】：传统加固土体的方法主要是通过在土中加入一定量的高性能掺合剂使之成为一种强度较高的复合土体,但这种方法需要较长的养护时间,且不经济。利用一种新型实用的生物酶固化技术,针对香港地区3种常见的海洋黏土、完全风化花岗岩和完全风化凝灰岩,开展了土体加固试验研究。试验结果表明,生物酶对海洋土的加固效果最好,强度增加最高可达20%,而生物酶对完全风化花岗岩的加固效果则不太理想,抗剪强度指标只有少许改变。此外,海洋土和完全风化凝灰岩的压缩性因为生物酶的作用反而有所增强。最后,从微观上分析了生物酶固土作用的本质,指出固土效果主要缘自于生物酶分子与土中的黏土矿物分子发生相互作用产生的胶结作用。
[Abstract]:The traditional method of strengthening soil is to make it a kind of composite soil with higher strength by adding a certain amount of high-performance admixture into the soil, but this method needs longer curing time and is not economical. Based on a new practical biological enzyme curing technique, soil reinforcement experiments were carried out for three common marine clay soils, completely weathered granite and completely weathered tuff in Hong Kong. The experimental results show that the biological enzyme has the best effect on the reinforcement of marine soil, and the maximum strength increase can be up to 20%, while the biological enzyme's strengthening effect on completely weathered granite is not very satisfactory, and the shear strength index has only a slight change. In addition, the compressibility of marine soil and fully weathered tuff is enhanced by the action of biological enzymes. Finally, the essence of soil consolidation by biological enzyme is analyzed from the microcosmic point of view. It is pointed out that the effect of soil consolidation is mainly due to the cementation produced by the interaction between biological enzyme molecules and clay mineral molecules in soil.
【作者单位】：中山大学岩土工程与信息技术研究中心;南京水利科学研究院;香港大学土木系;香港房屋署;
【基金】：香港房屋署资助(No.CB20100089) 国家自然科学基金(No.51209237) 高校基本科研业务费(No.13lgpy05)
【分类号】：TU521.3

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