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 BRECCIATED MARL WITH LATERAL CONFINEMENT

This paper studies the expansive behaviour of a new kind of expansive rock-brecciated marl and factors that influences the behaviour.After this kind of rock is disturbed,the rock can absorb water and occur expansion.It can bring it's structure deformation and damage even.The expensive force index is studied in the balance-pressure method and the full inflation method with GDG high pressure instrument.The rock sample is laterally confined.The paper points out the reason that the index of the full inflation method is bigger than that of the balance method.It studies the expansion laws and factors that influences expensive deformation when ampleful water is supplied to the brecciated marl in lateral restraint free expansion test.The rock sample comes from Taihangshan tunnel of ShiTai Railway.The test result tells us that brecciated marl is different from the other normal expansive rocks.The axial deformation ratio increases as the rock water content ratio increases and reduces as the rock density increases.