静力贯入法检测土石混合料路基压实度研究  

Study on Feasibility of Determining Degree of Compaction of Subgrade with Soil and Rock Mixture by Static Penetration Method

作　　者：蔺彪 LIN Biao(Ordos Highway Survey and Design Institute,Ordos,Nei Mongol 017000,China)

机构地区：[1]鄂尔多斯市公路勘测设计院

出　　处：《公路工程》2019年第5期201-206,共6页Highway Engineering

基　　金：内蒙古自治区科技攻关计划项目(201705123)

摘　　要：基于土石混合料的结构构造和物理力学性质复杂,采用静力贯入法对其路基压实质量进行了研究。通过室内试验对含石量分别为30%、50%、70%的土石混合料采用室内振动法成型试件,确定最大干密度和最佳含水量;制作含石量30%、50%、70%的不同压实度的土石混合料路堤模型,验证了静力贯入法检测土石混合料路基压实度的可行性。研究发现,土石混合料最大干密度随含石量增加呈直线趋势增长,含石量为70%时,最大干密度为2.12g/cm^3;探头形状为平底圆形时,贯入曲线具有一定的规律性,能较好地建立力学模型;贯入荷载与压实度正相关,贯入曲线可以较好地模拟与土石混合料压实度的相关性。Based on the complex structure,structure,and physical and mechanical properties of soil-rock mixture,the subgrade compaction quality was studied by static penetration method. Through indoor tests,the soil-rock mixture containing 30%,50%,and 70% of the stone content was molded by the indoor vibration method to determine the maximum dry density and the optimum moisture content;the content of stone content was 30%,50%,and 70. The embankment model of soil-rock mixture with different compaction degree has verified the feasibility of the static penetration method for measuring the compaction degree of the soil-stone mixture embankment. The study found that the maximum dry density of soil-rock mixture increases linearly with the increase of stone content. When the stone content is 70%,the maximum dry density is 2.12 g/cm^3. When the probe shape is flat-bottomed,the penetration curve has a certain degree. The regularity can well establish the mechanical model;the penetration load is positively correlated with the degree of compaction,and the penetration curve can better simulate the correlation with the degree of compaction of the soil-rock mixture.

关 键 词：静力贯入法 土石混合料 压实度 最大干密度 

分 类 号：U416[交通运输工程—道路与铁道工程]