济宁、兖州地区灰黑色-黑色黏土工程特性研究  

Research on engineering characteristics of greyblack-black clay in Jining and Yanzhou regions

作　　者：滕德宾[1,2] 王清[1] 陈慧娥[1] 赵新村[3] 李卫东[4] 

机构地区：[1]吉林大学建设工程学院,长春130026 [2]山东省地质矿产勘查开发局,济南250013 [3]山东省鲁南地质工程勘察院,山东兖州272100 [4]江西应用技术职业学院国土资源系,江西赣洲341000

出　　处：《世界地质》2008年第4期412-416,共5页World Geology

基　　金：国家自然科学基金(40372122);吉林大学985工程项目联合资助

摘　　要：为进一步明确济宁、兖州地区地层浅部分布的灰黑色-黑色黏土的工程特性,采用放射性14C法测定了该土层的形成年代,用扫描电镜采集了土样的微观结构照片,对土层的工程地质性质进行了分析,并提出了适用于本层土的地基处理方法。结果表明:这层灰黑色-黑色黏土层形成于全新世,具有孔隙比大(平均值为1.096)、压缩性高(压缩系数平均值为0.52MPa-1)、强度较低(黏聚力平均值为36.0kPa、地基承载力特征平均值为100kPa)、透水性低(渗透系数平均值<1.0×10-6cm/s),具有絮凝状结构等工程特性。该层土是一种特殊土,在本区进行工程建设时可根据具体情况选择挖除、换填垫层法、砂石桩法、水泥搅拌法、强夯法和桩基等基础处理方案。In order to further clarify the engineering property of the greyblack-black clay layer in the studied then foundation treatment method suitable to this kind of soil is put forward. The results show that the soil is formed in Holocene, and characterized for engineering by big void ratio, high compressibility, low shear strength, low permeability and flocculate structure. The mean value （MV） of the void ratio is 1. 096, the MV of compressibility coefficient is 0. 52 MPa^-1 , the MV of cohesion is 36. 0 kPa, the characteristic MV of subgrade bearing capacity is 100 kPa, and the MV of permeability coefficient is lower than 1.0 × 10 ^-6 cm/s. The layer of soil is special, so the proper foundation treatment schemes in this region should be selected according to specific condition in construction, including excavation, replacement cushion method, sandstone pile, cement mixing pile, dynamic consolidation, and pile foundation.

关 键 词：灰黑色-黑色黏土 特殊土 工程特性 基础处理方案 济宁 兖州 

分 类 号：TU411[建筑科学—岩土工程]