CAJ | 학술논문

软岩应力松弛特性研究是其长期力学特性研究的重要方面,亦是保证高地应力软岩隧道长期安全稳定的关键.采用TLW-2000三轴流变仪,对宜-巴(宜昌至巴东)高速公路泥质红砂岩进行围压为30 MPa的应力松弛试验研究.试验结果表明,在松弛过程中,随着松弛损伤的发展,导致松弛具有明显的非线性特征.对松弛过程中损伤耗散能变化规律的分析,建立松弛损伤的演化方程,并将损伤因子引入到西原模型中建立非线性的松弛损伤模型,通过与试验结果的对比分析,验证所建模型的合理性,可为宜-巴高速公路高地应力软岩隧道长期稳定性分析提供科学依据.
연암응력송이특성연구시기장기역학특성연구적중요방면,역시보증고지응력연암수도장기안전은정적관건.채용TLW-2000삼축류변의,대의-파(의창지파동)고속공로니질홍사암진행위압위30 MPa적응력송이시험연구.시험결과표명,재송이과정중,수착송이손상적발전,도치송이구유명현적비선성특정.대송이과정중손상모산능변화규률적분석,건립송이손상적연화방정,병장손상인자인입도서원모형중건립비선성적송이손상모형,통과여시험결과적대비분석,험증소건모형적합이성,가위의-파고속공로고지응력연암수도장기은정성분석제공과학의거.
Study of stress relaxation properties of soft rock is an important aspect of long-term mechanical property, which is very important to keep soft rock tunnel long-term stability. The stress relaxation test of red silty mudstone under triaxial compression with confining pressure of 30 MPa is carried out on TLW-2000 triaxial rheological machine. The test results show that: with the deterioration of material properties and relaxation damage evolution, the process of stress relaxation is nonlinear. By analyzing the damage energy dissipation during stress relaxation, a new relaxation damage equation is established. And, a nonlinear relaxation model is established by introducing the damage factor into Nishihara model. The fitting results of stress relaxation test show that the stress relaxation properties are well reflect by this model. The research results provide a scientific basis for long-term stability analysis of soft rock tunnel for Yichang-Badong Expressway.