用孔压静力触探求固结系数的研究_孟高头

收稿日期:1999208217;修改日期:2000208202用孔压静力触探和室内固结试验求取土的固结系数的对比研究孟高头1,张德波1,刘春宇1,张迎春2,肖　锋2,梁榕生3,陈龙智3,伍尚干3(1.中国地质大学,武汉　430074;2.广东省航务工程总公司,广州　510230;3.广东省冠粤路桥有限公司,广州　510600)摘要:土的固结系数是软土地基计算与处理设计中的关键参数,本文根据先进的孔隙水压力静力触探技术现场测试求出的固结系数和室内固结试验所求固结系数,进行了大量统计对比研究,发现两者之间存在很好的线性相关关系,并论述了两种方法求取固结系数的原理及步骤,以及孔压静力触探求固结系数的许多优点。

关键词:固结系数;孔隙水压力静力触探;超孔隙水压力消散试验;回归分析中图分类号:TU 413 文献标识码:A 文章编号:100023665(2001)0120018203Abstract :T he conso lidati on coefficient of so il is the key param eter fo r soft so il i m p rovem ent calculati on and design .It can be deter m ined by bo th p iezocone penetrati on test (CPTU )and lab .conso lidati on test .So the comparison research w ith bo th tests and m ethods are carried out and studied .T he result have show n that the coefficient deter m ined by tw o m eth 2ods exists linear relati onsh i p .T he p rinci p le and the m ethods to deter m ine the coefficient as w ell as a lo t of advantages of CPTU m ethod are also p resented here .Key words :conso lidati on coefficient ;CPTU ;excess po re p ressure dissi pati on test ;regressi on analysis 如何准确求取地基沉降值,进而采用合理的地基处理方法,成为提高工程质量、缩短工期、降低成本的关键。

第24卷　第3期2007年3月 公　路　交　通　科　技Journal of Highway and T ransportation Research and DevelopmentV ol 124　N o 13 Mar 12007文章编号:1002Ο0268(2007)03Ο0030Ο05收稿日期:2005Ο09Ο15基金项目:江苏省交通科学研究计划资助项目(7621006028)作者简介:蔡国军(1977-),男,山东兖州人,博士研究生,从事道路软基处理及土体原位测试技术的研究1(focuscai @1631com )孔压静力触探(CPTU )探求高速公路软基固结系数研究蔡国军,童立元,刘松玉,杜广印(东南大学　交通学院,江苏　南京　210096)摘要:基于孔压静力触探(CPT U )的原理,简要介绍了利用CPT U 试验求解地基土固结系数的理论方法,并以T or 2stenss on 理论模型为例,详细叙述了利用CPT U 试验资料探求地基土固结系数的方法和步骤。

结合连盐高速公路灌云三标的CPT U 试验进行了实例计算,结果表明,现场所得的固结系数较室内试验的固结系数大1～2个数量级,与其他研究者的结果一致;在淤泥土层内,现场固结系数较室内试验所得的固结系数变化小,与现场资料反演值很接近;若采用此方法为实际工程提供设计固结系数时,进行修正后效果会更好。

关键词:道路工程;软基;孔压静力触探;固结系数;孔压消散试验中图分类号:U441+18 文献标识码:ADetermination of Consolidation Coefficient for Expre ssway on Soft Groundfrom the Piezocone Penetration Te stC AI G uo Οjun ,T ONGLi Οyuan ,LI U S ong Οyu ,DU G uang Οyin(T ransportation C ollege ,S outheast University ,Jiangsu Nanjing 210096,China )Abstract :Based on the piezocone (CPT U )penetration theory ,several methods for deriving the coefficient of cons olidation from CPT U pore pressure dissipation data were introduced in brief 1The method and procedure to determine the coefficient of cons olidation from CPT U dissipation tests were als o presented in details by taking the exam ple of T orstenss on theory m odel 1The CPT U tests results of s oft ground in Lian Οyan express way were presented and the coefficient of cons olidaion was obtained from the piezocne data 1The results of the coefficient of cons olidation were com pared with labortory oedometer tests data and back Οcalculated values from field settlement data 1C om paris ons of the results indicated that the coefficient of cons olidation determined by CPT U tests was higher than that measured in the labortory cons olidation tests by 10to 100times ,as reported by other researchers 1The coefficient of cons olidation values from CPT U tests were in less variation than those obtained by labortory tests and were in g ood agreement with the back Οcalculated coefficient of cons olidation values in the s oft marine clay 1When the coefficient of cons olidation from CPT U dissipation tests were used directly for design ,it should be corrected by various factors in practice 1K ey words :road engineering ;s oft ground ;piezocone penetration test (CPT U );coefficient of cons olidation ;pore pressure dissipa 2tion test0　引言孔压静力触探(英文简称CPT U )作为一种简捷、快速、方便、可靠的新型原位测试技术,除了能在测试过程中比常规静力触探多量测出土的孔隙水压力外,还能够在预定深度停止贯入后进行孔隙水压力的消散试验,并由此探求软土的固结系数[1]。

硕士研究生文献阅读与综述论文题目：现代多功能CPTU的数值模拟学号：2015220524研究生姓名：卫才皇导师姓名:杨令强王君鹏学科、专业：建筑与土木工程所属院、系：土木建筑学院2016年5月14日多功能CPTU研究综述卫才皇摘要：静力触探法是工程中广泛使用的一种原位测试方法。

通过归纳分析国内外相关资料，概述了静力触探仪器设备发展历程，系统归纳了静力触探在锥头贯入阻力理论研究、模型试验、数值模拟、成果应用等方面的研究进展，总结了不同行业、不同地区利用静力触探成果估算土体参数的经验公式；提出由静力触探成果推求土体参数时，应充分考虑区域性土的工程特性；指出在超孔隙水压力理论分析、柱形孔空间问题解析解和以大变形分析理论为基础的数值模拟等方面需要进一步完善。

关键词：静力触探；理论研究；模型试验；数值模拟Research Review on Static Cone Penetration TestWei CaihuangAbstract:Static cone penetration (CPTU) is an situ test,which is widely used in the engineering practice.Based on recent research results,this paper introduced the development course of CPTU and summarized the research progress of the instrument development,theoretical rearch of cone resistance,model test ,numerical simulation,and different areas were summarized.The paper pointed out that it is necessary to fully consider the engineering characteristics of regional soil when using the CPTU results. Moreover,the theoretical analysis of excess pore water pressure,anatlyic solution of cylindrical hole space problem,and numerical simulation for large deformation analysis theory need to be further improved.Key words:cone penetration test;theoretical research;model test;numercial simulation1前言静力触探法是用于划分土层、判别土体液化、确定地基承载力等参数常用的原位测试方法，具有操作简单、费用低、成果准确、周期短、节省人力等优点。