Study on Preliminarily Estimating Performance of Elementary Deep Underground Engineering Structures in Future Large-Scale Heat Mining Projects

Figure 8

Three superposition models for estimation of EGS-E efficiency. (a) The ranges of tunnels and surrounding rock are and , respectively. (b) The ranges of tunnels and surrounding rock are and , respectively. (c) The ranges of tunnels and surrounding rock are and , respectively.

(a)

(b)

(c)