摘要
通过对花岗岩在20 ℃～600 ℃范围内基本力学性质的研究,探讨了弹性模量、单轴抗压强度以及泊松比随温度的变化规律,发现75 ℃和200 ℃分别为花岗岩弹性模量和单轴抗压强度的门槛温度。以弹性模量为研究对象,提出了热损伤的概念,并给出了热损伤本构方程的一般表达式;在Lemaitre损伤模型的基础上,推导了一维TM耦合弹脆性损伤本构方程和损伤能量释放率的表达式;参照经典塑性力学的屈服面理论,引入了温度作用下应力空间中脆性岩石的损伤面模型,定性地讨论了荷载和温度影响下损伤面时的演化规律。
It is pointed that 75 ℃ and 200 ℃ are the threshold temperatures of elastic modulus and uniaxial compressive strength for granite according to the test between 20 ℃ and 600 ℃ individually. The laws of elastic modulus, unaxial compressive strength and possion抯 ratio are discussed with the temperature. The concept of thermal damage is founded and thermal damage equation is given. Giving an imitation of Lemaitre damage equation, one dimension TH coupled constitutive equation is deduced and discussed. Giving an imitation of traditional plastic theory , a damage surface model on brittle rock about temperature in stress-space is introduced and the evolutionary law is discussed qualitatively.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2003年第S2期188-191,共3页
Rock and Soil Mechanics
关键词
花岗岩
门槛温度
损伤
granite
threshold temperature
damage
