High-salt-rock-content tunnel multi-support system and inverted arch steel bar mounting method

The invention discloses a high-salt-rock-content tunnel multi-support system. The high-salt-rock-content tunnel multi-support system comprises a primary support, a first waterproof layer, a waterproofconcrete layer, an anti-sticking waterproof plate and a secondary lining which are arranged in sequence. The inner ring surface, away from surrounding rock, of the waterproof concrete layer is configured to be subjected to smooth treatment. The first waterproof layer is provided with geotechnical cloth and EVA waterproof plates which are laid in a full-ring mode. The primary support is configuredto be poured by adopting early high-strength sprayed concrete. The waterproof concrete layer is configured to be poured by adopting polymer concrete. The secondary lining is configured to be poured by adopting high-strength plastic wave-absorbing concrete. The high-strength plastic wave-absorbing concrete comprises the components of filling type plant fibers. The filling type plant fibers are configured by taking hollow t