|
|||||
|
|
| 北京平原区新近沉积土基本工程地质特性分析 | |
| 引用本文： | 袁仁茂,孙宏伟,马凤山,李树德,邓清海.北京平原区新近沉积土基本工程地质特性分析[J].第四纪研究,2005,25(1):93-99. |
| 作者姓名： | 袁仁茂 孙宏伟 马凤山 李树德 邓清海 |
| 作者单位： | 中国科学院地质与地球物理研究所,北京,100029;北京大学环境学院,北京,100871;北京市堪察设计研究院,北京,100038;中国科学院地质与地球物理研究所,北京,100029;北京大学环境学院,北京,100871 |
| 基金项目： | 国家重点基础研究发展计划(973计划);北京市自然科学基金 |
| 摘 要： | 文章通过各种实验,分析了北京市新近沉积土的物质组成、化学成分、矿物成分及其基本的岩土工程特 性。结果表明,新近沉积土在总体上是工程地质性质较差的地层,一般来讲呈欠压密状态,具有较高的压缩性,强 度相对较低。但是对于新近沉积的砂质粉土而言,即当塑性指数Ip<7时,通过比较发现新近沉积土的实验数据则 接近于一般第四纪沉积土,并出现了交错,反映出新近沉积的砂质粉土与一般第四纪沉积的砂质粉土的力学性质 指标接近而不容易被区分。 |
| 关 键 词： | 新近沉积土 工程地质特性 北京平原区 |
| 文章编号： | 1001-7410(2005)01-93-07 |
| 收稿时间： | 2004-10-15 |
| 修稿时间： | 2004年10月15 |
PHYSICOCHEMICAL AND GEOTECHNICAL CHARACTERISTICS OF THE RECENTLY DEPOSITED SOIL IN BEIJING PLAIN REGION |
|
| Yuan Renmao,Sun Hongwei,Ma Fengshan,Li Shude,Deng Qinghai.PHYSICOCHEMICAL AND GEOTECHNICAL CHARACTERISTICS OF THE RECENTLY DEPOSITED SOIL IN BEIJING PLAIN REGION[J].Quaternary Sciences,2005,25(1):93-99. | |
| Authors: | Yuan Renmao Sun Hongwei Ma Fengshan Li Shude Deng Qinghai |
| Institution: | 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029; 2. College of Environmental Sciences, Peking University, Beijing 100871; 3. Beijing Site Investigation and Design Research Institute, Beijing 100038 |
| Abstract: | We analyzed the particle distribution, physicochemical characteristics, mineral components, and the geotechnical characteristics of recently deposited soil in Beijing area. The results indicated that, (1) The granulometric composition of recently deposited soil in this area was even, with poor gradation. The percentage composition of SiO 2 is very high, approximately 56%～73%. The organic content with 1.25% is higher than that of general Quaternary deposited soil. The mineral composition mainly included smectite, illite, and kaolinite. Illite content occupies the dominant position. (2) The void ratio (e) is high, about 0.783 equally. The value of saturation degree (S r) approaches 1. The value of plasticity I P and liquidity I L is about 4.4～24.3 and 0.26～0.96. I L increases along with I P. Silt (I P<10) with the value of I L between 0.26～0.60 is plastic, cohesive soil (I P>10) with the value of I L between 0.60～0.96 is plastic or molliplastic. (3) The value of modulus of compression E S mostly is between 4～15MPa, obviously lower than that of the corresponding general Quaternary deposited soil. But, when the plasticity index I P of recently deposited soil is higher 7, the characteristics of recently deposited silt soil approximate that of general Quaternary deposited silt soil, and indicate that it is very difficult to distinguish these two kinds of silt soils. (4) The double logarithm relations curve of P-S is the simple fold line, and could be only determined by 4 eigen parameters. According to the statistical relations of 4 eigen parameters and all kinds of geotechnical indexes, the P-S curve of loading test could be obtained as long as we knows its geotechnical indexes, then the allowable bearing capacity of the recently deposited soil also could be determined. |
| Keywords: | recently deposited soil engineering geological characteristic Beijing plain region |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |
| 点击此处可从《第四纪研究》浏览原始摘要信息 | |
| 点击此处可从《第四纪研究》下载免费的PDF全文 | |