ELASTIC WAVE VELOCITY AND MECHANICAL PROPERTIES OF SANDSTONE UNDER DIFFERENT WATER CONTENTS AT LONGYOU GROTTOES
(1. College of Civil Engineering and Mechanics，Lanzhou University，Lanzhou，Gansu 730000，China；2. Institute of Geology
and Geophysics，Chinese Academy of Sciences，Beijing 100029，China；3. Dunhuang Research Academy，Dunhuang，Gansu
736200，China)
Abstract：To study the impact of water environment change on weathering and damage of Longyou grottoes，the experimental research on the mechanical property and the elastic wave velocity of sandstone under different water contents is conducted. The change laws of stress-strain curve and mechanical properties such as peak stress，elastic modulus are also analyzed. The analysis results show that the water content has obvious effect on stress-strain curve and mechanical properties of sandstone：strain softening behavior weakens，peak stress and elastic modulus decreases exponentially with the increase in water content. Elastic wave velocity test results indicate that the uniaxial compressive strength is linear with elastic wave velocity，and the elastic wave velocity decreases abnormally to a very low value at the water content of about 1.5% due to expansible clay minerals. The water content has a little impact on anisotropy. Therefore，it can be concluded that dry and steady environment is of benefit to the conservation of Longyou grottoes.
邵明申1，李 黎2，李最雄3. 龙游石窟砂岩在不同含水状态下的弹性波速与力学性能[J]. 岩石力学与工程学报, 2010, 29(S2): 3514-3518.
SHAO Mingshen1，LI li2，LI Zuixiong3. ELASTIC WAVE VELOCITY AND MECHANICAL PROPERTIES OF SANDSTONE UNDER DIFFERENT WATER CONTENTS AT LONGYOU GROTTOES. , 2010, 29(S2): 3514-3518.
2010, Vol. 29 
