开挖中的围岩破裂性质与支护对象研究

Study on Characteristics of Rock Broken by Excavation and Roof Supporting Object

为了保证地下工程的稳定和安全,研究地下工程的围岩状态和支护对象很有意义.在现场实测、物理和数值模拟的基础上,提出深埋地下工程的围岩中普遍存在破裂状态,并认为这一破裂状态区域具有许多特殊的性质和规律,是一个反映地应力和岩体强度对地下工程稳定性作用的综合指标.破裂区发展产生的碎胀变形或碎胀力是地下工程支护的对象或载荷来源.

In order to keeping the stable and sale oi undergrouna projects, it is of a great importance to study the physical states of the surrounding rock and the supporting obiect of underground projects. On the basis of the site measurement, lab and numerical simulations, it is pointed out that there is usually a broken state zone existed around a deep excavation ; this zone has many special characteristics and is a comprehensive index to represent the action of both earth stress and rock mass strength on the stability of underground proiects. The roof supporting object （or the loading source） is the bulking deformation （or the bulking force） produced during the enlarging of a broken state zone after erecting a support.