Research Initiation: Induced Fracture Stress Measurement inRock

为了采矿、运输车辆或流体的隧道、水坝附近的发电厂、储存废物和各种其他目的，通常在岩石上开地下洞。用于确定防止坍塌所需的支撑类型的分析，首先是对岩石中原始应力状态的说明。不幸的是，岩石中的水平应力不能解析确定，也没有普遍有效的技术来经济地测量这些应力。该项目将尝试将水力压裂技术与最近开发的薄膜压电传感器相结合，以确定应力状态。该项目的目标是发展该技术，使其可以广泛使用，并证明其经济可行性。

Underground openings are regularly made in rocks for mining, for tunnels to convey vehicles or fluids, for power plants near dams, for storage of wastes, and a variety of other purposes. Analyses used to determine the types of supports needed to prevent caving, begin with a specification of the original state of stress in the rock. Unfortunately, the horizontal stresses in rock cannot be determined analytically and no generally useful technique exists for economical measurement of these stresses. This project will involve an attempt to use a combination of a hydraulic fracturing technique with recently developed thin-film piezoelectric trans- ducers to determine the stress state. The goal of the project is to develop the technique so it can be widely used and to demonstrate its economic feasibility.