基于旋转触探技术的土体压缩模量确定方法  

Estimation of Soil Compression Modulus under Different Stress States Based on Rotary Penetration Test

作　　者：李鹏[1] 

机构地区：[1]铁道第三勘察设计院集团有限公司,天津300142

出　　处：《铁道工程学报》2016年第8期34-39,65,共7页Journal of Railway Engineering Society

基　　金：天津市城乡建设委员会科技开发项目(2014-10)

摘　　要：研究目的:旋转触探具有勘探深度大、测试数据连续且重复性好、测试快捷经济等优点,是一种具有广阔工程应用前景的新型原位测试方法。本文通过大量现场对比试验分析,建立基于旋转触探技术的不同应力条件下土体压缩模量确定经验公式,揭示旋转触探比功和应力效应对土体压缩模量的影响规律,为促进旋转触探技术工程应用提供技术支撑。研究结论:(1)提出采用旋转触探探头贯入地层破坏单位体积土体所做的功,即旋转触探比功作为旋转触探特征量;(2)旋转触探比功与各应力条件下土体压缩模量之间均具有良好的线性相关性,可通过旋转触探试验预测土体压缩模量;(3)在土体通常所受的工程应力水平条件下(≤1.6 MPa),土体压缩模量随着应力水平增大而增大,具有显著的应力相关性;(4)利用旋转触探比功,建立了天津地区基于旋转触探技术确定粉土、粉质黏土和黏土不同应力条件下的土体压缩模量经验公式,可为相关工程提供参考。Research purposes： Rotary penetration test is a new in - suit testing method that has broad application prospect. It has high efficiency in exploration depth, continuous repeatability, rapid test, economic benefit and other advantages. Through extensive field comparative test analysis, series empirical formulas of soil compression modulus under different stress conditions were established based on rotary penetration test, the influences of the specific energy of rotary penetration test and stress effects on soil compression modulus were revealed. The study results can provide a case for related engineering and promote the application of rotary penetration test. Research conclusions ： （ 1 ） The characteristics of rotary penetration test were proposed using the specific energy, which was represented as the work of per unit volume of soil mass penetrated by the rotary penetration probe. （2） The specific energy of rotary penetration test showed good linear correlation to soil compression modules under different stress conditions. （3） Under the engineering stress levels （ ≤ 1.6 MPa）, soil compression modulus increased with the increase of stress level, which has the significant stress correlation. （4） The specific energy of rotary penetration test was applied to establish the empirical compressive modulus formulas of silt, clay and silty clay under different stress conditions in Tianjin, which can provide reference for related projects.

关 键 词：旋转触探 旋转触探比功 压缩模量 

分 类 号：TU471[建筑科学—结构工程]