Underground-excavation remediation method for deep-layer contaminated soil

The invention provides an underground-excavation remediation method for deep-layer contaminated soil. The method comprises the following steps: 1) site rechecking and analyzing; 2) contamination distribution three-dimensional data simulating; 3) excavation parameter designing and construction operation preparing; 4) operating well constructing; 5) ductule grouting shoring; 6) contaminated soil longitudinal excavating; 7) contaminated soil remedying; and 8) uncontaminated soil backfilling. According to the method, an underground excavation mode is employed, a soil contamination range is determined through contamination distribution three-dimensional data simulating, the contaminated soil is subjected to fixed-point excavation, an overground space is not occupied, uncontaminated soil of ground surface is not required to be excavated, and large-scale shoring is also not required, so that the construction cost is reduced, environmental pollution such as ambient air, sewage and noises generated from open excavatio