摘要
海南岛西北部洋浦湾北侧滨海地区地层中揭露出一层更新世半成岩胶结砂层,由于目前我国《岩土工程勘察规范》中尚无对半成岩胶结砂层有明确的定义和勘察技术要求,如何分类评价和利用这一特殊岩土体成为工程设计中的主要问题。工程勘察分析表明,从其组成、结构和构造等方面来看,该土层尚处在一种由砂土层向成岩方向发展的半成岩过程中,既有显著的砂土特征,又有部分成岩的特征;从分类评价上来看,它是一种在特定沉降环境条件下形成的、类似于硬土-软岩的特殊岩土体。实际工程中,将该土层勘察中的取芯率作为辅助指标,用以评价该类土层的均衡性,并通过取芯率对土的压缩性指标进行修正,以期获得基础沉降计算的合理值。
The pleistocene epoch half-diagenesis cemented sand have been revealed in the coast of north Yangpu bay in northwest Hainan island. Due to no clear definition and exploring technical regulation for half-diagenesis cemented sand in Code for Investigation of Geotechnical Engineering at present, how to clas-sify, evaluate and utilize this kind of special geology body is a main problem in engineering design. The en-gineering exploration and analysis indicated this soil layer is on the transaction way from sand to diagenesis based on its composition, structure and constitution. It has not only obvious sand characters, but also partly diagenesis characters. From the viewpoint of classification and evaluation, it is a special geology body formed in special deposit environment, similar to hard soil-soft rock. In practical engineering, the ratio of core recovery in exploring can be used as an auxiliary index to appraise uniformity of this kind of soil, and also used to correct its compression modulus so as to get rational value of foundation settlement calculation.
出处
《勘察科学技术》
2014年第1期35-39,共5页
Site Investigation Science and Technology
关键词
半成岩
胶结砂层
取芯率
压缩模量
沉降
half-diagenesis
cemented sand
ratio of core recovery
compression modulus
settlement
