基于原位测试的圆砾层地基工程性质分析方法  

Analysis Method of Engineering Properties of Round Gravel Layer Foundation Based on In - situ Testing

作　　者：张磊 朱雷 次婧 ZHANG Lei;ZHU Lei;CI Jing(Civil Engineering Department of Tianshui Normal University,Tianshui 741000,China;Chinese Academy of Sciences,Chengdu Institute of Mountain Hazards and Environment,Ministry of Water Resources,Chengdu 610041,China;Gansu Water Investment Group Co.,Ltd.,Lanzhou 730030,China)

机构地区：[1]天水师范学院土木工程学院,甘肃天水741000 [2]中国科学院、水利部成都山地灾害与环境研究所,四川成都610041 [3]甘肃省水务投资集团有限公司,甘肃兰州730030

出　　处：《科技创新与生产力》2024年第7期136-141,共6页Sci-tech Innovation and Productivity

基　　金：甘肃省住房和城乡建设厅2023年建设科技项目计划(JK2023-12);甘肃省教育厅2023年高校教师创新基金项目(2023A-112)。

摘　　要：本文对天水冲洪积圆砾层进行了多组平板载荷试验,特别针对钎探数据显示工程性质较好与较差的点进行了对比试验,总体表现为圆砾层最终沉降量较小,经分析,试验曲线不完整,未能反映出极限状态,采用该曲线确定的地基承载力偏小,圆砾层工程性质未能有效发挥。采用双曲线切线模量法计算后的p-s曲线更加完整,能较准确判断出极限承载力pu,经计算,钎探击数较小的试验点pu也能达到700 kPa,钎探击数较大的试验点pu可以达到1400 kPa,这主要与土的结构特征有关,实际开挖剖面后证明了这一点。另外,采用切线模量法计算出的实际基础尺寸下荷载沉降p-s曲线与监测数据吻合度高,说明该分析方法可靠,该分析方法确定圆砾层地基承载力及最终沉降量准确且高效。In this paper,multiple sets of flat plate load tests are conducted on the Tianshui alluvial gravel layer,especially for the points where the drilling data showed good and poor engineering properties.The overall performance is that the final settlement of the gravel layer is small.After analysis,the test curve is incomplete and do not reflect the ultimate state.The bearing capacity of the foundation determined by this curve is too small,and the engineering properties of the gravel layer are not effectively utilized.The p-s curve calculated using the hyperbolic tangent modulus method is more complete and can accurately determine the ultimate bearing capacity pu.After calculation,the pu at the test point with a smaller number of drill bit tests can also reach 700 kPa,and the pu at the test point with a larger number of drill bit tests can reach 1400 kPa.This is mainly related to the structural characteristics of the soil,which has been proven by the actual excavation profile.In addition,the p-s curve of load settlement under actual foundation size calculated by the tangent modulus method is highly consistent with the monitoring data,indicating the reliability of the analysis method.The analysis method accurately and efficiently determines the bearing capacity and final settlement of the gravel layer foundation.

关 键 词：土力学 圆砾层 强度 承载力 沉降 

分 类 号：TU43[建筑科学—岩土工程]