为了研究水化学腐蚀对华南红层软岩物理力学性质的影响，使用pH为4、6的H₂SO₄溶液模拟酸性环境，pH为8、10的NaOH溶液模拟碱性环境，以及pH为7的Na₂SO₄溶液模拟中性环境。对受腐蚀试验进行三轴加载试验，分析力学参数劣化规律。利用电镜扫描试验（scanning electron microscope, SEM）对受腐岩石微观结构变化进行分析。基于统计损伤理论，引入化学损伤变量和Weibull分布函数，建立考虑损伤阈值的红层软岩损伤本构模型。研究表明：经不同化学溶液腐蚀后，岩石物理力学性质显著劣化：pH由7降至4，峰值强度降低28.1%，弹性模量降低16.38%；pH由7升至10，峰值强度降低15.84%，弹性模量降低10.11%。溶液酸碱浓度的提升均会使得红层软岩内部裂隙扩展，破坏骨岩石架结构的连续性。不同pH溶液对力学参数的影响依次为强酸（pH ＝ 4） >强碱（pH ＝ 10） >弱酸（pH ＝ 6）>弱碱（pH ＝ 8） >中性（pH ＝ 7）。模型计算结果与试验数据拟合效果较好，能够为华南地区工程施工建设提供理论依据。

To investigate the effects of hydrochemical corrosion and engineering disturbances on the physical and mechanical properties of soft red-bed rock in South China, H₂SO₄solutions with pH values of 4 and 6 were used to simulate acidic environments, NaOH solutions with pH values of 8 and 10 to simulate alkaline environments, and a Na₂SO₄ solution with a pH of 7 to simulate a neutral environment. Triaxial compression tests were conducted on corroded samples to analyze the deterioration patterns of mechanical parameters. Scanning electron microscopy (SEM) was employed to analyze the microstructural changes in the corroded rock. Based on the Drucker-Prager criterion, a damage constitutive model for red-bed soft rock was established by introducing a chemical damage variable and a Weibull distribution function, considering damage thresholds. The results indicate that the physical and mechanical properties of the rock deteriorate significantly after corrosion. When the pH decreases from 7 to 4, the peak strength drops by 28.1%, and the elastic modulus decreases by 16.38%. When the pH increases from 7 to 10, the peak strength drops by 15.84%, and the elastic modulus decreases by 10.11%. The increase in the concentration of acid and alkali in the solution will both cause the expansion of internal fractures in red-layer soft rock and disrupt the continuity of the skeletal rock framework structure. The influence of solutions with different pH values on mechanical parameters is in the following order: strong acid (pH = 4) > strong base (pH = 10) > weak acid(pH = 6) > weak base (pH = 8) > neutral (pH = 7). The model calculation results fit well with the test data, which can provide a theoretical basis for engineering construction in South China.