一、前言大型地下洞室设计的主要任务是确定洞室的位置,最优形状和尺寸、最佳方位以及必要的支护系统。在设计阶段,对地下洞室设计影响最大的岩体应力状态,一般都通过各种不同勘探方法来获得厂房区岩体地应力的状况,以便在厂房设计中加以充分考虑。多年来,在水电工程地下洞室设计中,大多使用套钻法进行地应力测量。这种方法由于 I. Preface The main task of the design of large underground caverns is to determine the location of the cavern, the optimal shape and size, the best orientation and the necessary support system. In the design stage, the stress state of the rock mass, which has the most influence on the design of underground caverns, is usually obtained through various exploration methods to get the stress state of the rock mass in the plant area so as to be fully considered in the plant design. Over the years, in the design of underground caverns for hydropower projects, most of them use the method of set drilling to measure the geostress. Due to this method