中子土壤水分仪在真空预压含水率测试中的应用

真空预压加固过程中含水率的变化与地基的加固效果密切相关。传统的地基土体含水率测试方法是取样进行室内试验,本文将智能中子土壤水分仪引入真空预压过程中含水率的现场测试中,通过现场钻孔取土试验进行仪器标定,进而研究真空预压过程中土体中的含水率。基于地基加固前后钻孔取土烘干法室内试验数据与中子土壤水分仪测试数据,研究中子土壤水分仪的测试精度;得到不同深度土体含水率随真空预压时间的变化规律,分析真空荷载对土体含水率变化的影响机制。测试方法简便,结果精度可靠。

Application of neutron soil moisture meter in water content test during vacuum preloading construction

The effect of foundation reinforcement is closely related to the change of water content in soil during vacuum preloading.The traditional test method of the water content is model test in the laboratory.This paper introduces the neutron soil moisture meter into the field test of water content during vacuum preloading construction.The instrument calibration is carried out through the indoor test for field borehole soil sampling,and then the water content of soil during vacuum preloading is studied.Based on the laboratory test data of oven drying method and the neutron soil moisture meter test data before and after foundation reinforcement,the test precision of the neutron moisture soil meter is studied.The variation law of soil water content with vacuum preloading time at different depths is obtained,and the influence mechanism of vacuum load on soil water content is analyzed.The test method is simple and convenient,and the result accuracy is reliable.