膏溶角砾岩侧限膨胀特性试验研究

研究了膏溶角砾岩的侧限膨胀特性及其影响因素。这种岩石受到扰动后可吸水发生膨胀变形使其结构发生变形甚至破坏。通过GDG高压固结仪采用平衡加压法和充分膨胀法研究了侧限情况下岩石的膨胀力指标, 解释了充分膨胀法膨胀力指标大于平衡加压法膨胀力指标的原因。通过试验研究了供水充足条件下膏溶角砾岩侧限自由膨胀变形演化规律, 阐述了膏溶角砾岩侧限膨胀变形的影响因素。岩石试样采自山西石太客运专线太行山隧道, 试验结果表明, 膏溶角砾岩的膨胀特性不同于常规的膨胀岩, 其轴向膨胀变形随含水率增加而增加, 随密度增大而减小。

LABORATORY TESTING FOR EXPANSIVE BEHAVIOUR OF BRECCIAT ED MARLW ITH LATERAL CONFINEMENT

Th is paper stud ies the expansive behav iour o f a new k ind o f expansive rock - brecc iatedm arl and fac to rs that influences the behaviour. A fter th is kind of rock is disturbed, the rock can absorb w ater and occur expan sion. It can br ing its' structure de fo rmation and damage even. The expensive force index is studied in the ba lancepressure method and the fu ll inflat ionmethod w ith GDG h igh pressure instrumen.t The rock samp le is laterally con fined. The paper po ints out the reason that the index of the full inf la tionm ethod is bigger than that o f the balance method. It stud ies the expansion law s and factors that influences expensive deformation w hen ample fu lw ater is sup plied to the brecciatedmarl in lateral restra int free expansion tes.t The rock samp le comes from Ta ihangshan tunne l of ShiTai Railw ay. The test result tells us that brecc iated marl is d ifferent from the o ther norm al expansive rocks. The ax ia l de fo rmation ratio increases as the rock w ater content ratio increases and reduces as the rock density in creases.