红层泥岩单轴膨胀力测试方法改进

郭永春; 朱元昊; 杨小奇; 刘本华; 杨颋; 彭明亮; 曾琳沣

doi:10.16030/j.heg.202407038

红层泥岩单轴膨胀力测试方法改进

Improved testing method for uniaxial swelling force of red-bed mudstone

摘要

摘要:
目的为解决现有岩石单轴膨胀力测试装置中岩石试样和标准套环之间空隙过大的问题，提出了用开口套环替代标准套环，先放样后加载的试样安装方法，使岩石试样与开口套环壁紧密接触，改进了现有单轴膨胀力试验方法。
方法选取四川地区典型的红层泥岩（原状样和重塑样）进行了开口套环和标准套环单轴膨胀力对比试验。
结果试验结果表明，原状样开口套环的单轴膨胀力（214.0 kPa）是标准套环（149.6 kPa）的1.44倍，重塑样开口套环的单轴膨胀力（159.2 kPa）是标准套环（125.8 kPa）的1.27倍，说明开口套环单轴膨胀力测试结果大于标准套环测试结果。
结论主要研究结论如下：（1）改进设计的开口套环和安装方法是合理有效的，提高了测试结果的精度，使岩石单轴膨胀力测试装置和方法更加完善；（2）开口套环的适用范围较宽，适用于不同膨胀岩（泥岩、泥质粉砂岩、硬石膏岩和泥灰岩）和不同膨胀等级（弱、中和强）的测试要求。使用改进后的试验方法与装置，使岩石单轴膨胀力测试结果更精确，能为工程建设提供更加合理的膨胀参数。

Abstract:
Aim To address the problem of excessive gap between the rock specimens and the standard sleeve in conventional uniaxial swelling force test devices, this study improves the existing testing method by replacing the standard sleeve with an open sleeve and adopting a “preset-then-load” installation procedure.
Method Typical red mudstone (undisturbed sample and remolded sample) in Sichuan area was selected to carry out the comparative test of uniaxial swelling force of open sleeve and standard sleeve.
Results The uniaxial swelling force of the original open sleeve (214.0 kPa) is 1.44 times that of the standard sleeve (149.6 kPa), and the uniaxial swelling force of the reshaped open sleeve (159.2 kPa) is 1.27 times that of the standard sleeve (125.8 kPa), The test results show that the uniaxial swelling force of the open sleeve is greater than that of the standard sleeve.
Conclusions The improved design of open sleeve and installation method are reasonable and effective, improving the accuracy of the test results and making the rock uniaxial swelling force test device and method more perfect; The open sleeve has a wide application range and is applicable to the test requirements of different expansive rocks (mudstone, argillaceous siltstone, anhydrite, and marlstone) and different expansion grades (weak, medium and strong). Using the improved test method and device, the test results of rock uniaxial swelling force are more accurate, providing more reasonable parameters for engineering construction.

HTML全文

参考文献(30)

施引文献

资源附件(0)