The distortion and destroy form of coved laneway in complicated stress condition are diversity, and it is relative with rock character, crustal stress and shoring structure.
拱形巷道在复杂应力条件下的变形以及破坏形式呈多样化，与围岩性质、地应力和支护结构相关。
2
The diversity gain is relative to the block length, and can amount to the full diversity gain only when the block length is no less than the number of transmit antennas.