The nonlocal correlation mechanism of quantum entanglement and the underlying dynamics of barrier penetration in quantum tunneling constitute long-standing foundational explanatory gaps in standard quantum mechanics. While the standard theory can accurately describe the phenomena and provide probabilistic outcomes, it cannot offer a geometric-topological origin at the spacetime level. Based on the foundational axioms of three-dimensional vector light-speed helical spacetime, this paper establishes a self-consistent geometric explanatory framework: microscopic quantum effects are attributed to emergent behaviors arising from the helical structure of spacetime, topological bonding, and spacetime curvature resonance. The contributions of this paper include: 1. Establishing the core axioms of three-dimensional helical spacetime and a three-level spacetime normalization equation, constructing a low-energy emergence mechanism for four-dimensional Minkowski spacetime, and resolving the self-consistency conflict between the old and new definitions of spacetime; 2. Deriving the topological throat structure for two-particle entanglement based on the principle of topological bonding stability, providing the spacetime geometric origin of nonlocal correlations in entanglement and a finite propagation time delay; 3. Building an eigenfrequency model of spacetime distortion in the potential barrier, formulating the geometric resonance condition for quantum tunneling, and deriving a discrete resonance tunneling prediction distinct from the WKB approximation; 14. Independently deriving the mass-energy equivalence relation, the Lorentz transformation, and the Bohr radius from the model’s axioms, thereby verifying the low-energy self-consistency of the frame work; 5. Presenting a complete first-order perturbation integral derivation for the hydrogen 1S-2S transition, yielding a quantifiable and verifiable prediction for a spectral shift; 6. Explicitly listing the mathematical limitations of the model, its boundary of applicability, and falsifiable experimental protocols. This framework offers a geometric alternative explanatory system distinct from standard quan tum mechanics and quantum field theory. All quantitative results and predictions are preserved for long-term academic scrutiny. Keywords: vector light speed; helical spacetime; topological throat; spacetime topological bonding; geometric resonant tunneling; quantum entanglement; hydrogen atomic spectral shift