针对成都地区红层软岩溶蚀空洞现象，以成都半岛城邦项目场地的红层软岩为例，选取不同深度的岩样进行室内浸水试验、淋滤试验和溶蚀试验，观察岩样在不同类型环境水下的作用性状和溶蚀特征，分析经历不同作用的含膏红层软岩 可溶成分的流失程度及其对环境水的影响。结果表明，红层软岩中的石膏含量随着深度的增加而增加，含膏红层及其环境水的腐蚀性显著增强；遇水后，红层软岩中的可溶成分逐渐溶解、流失，随着时间的积累；红层软岩孔隙增大，渗透性增强，红层的完整性丧失，强度衰减；在酸性环境水的作用下红层软岩中的钙质胶结物流失加剧，结构连接破坏严重，对红层的结构强度影响较大。对浸泡、淋滤和溶蚀作用后的试样，重点测试了抗压强度、波速等参数。试验结果表明，红层软岩经硫 酸溶液腐蚀后岩样的结构被破坏，单轴抗压强度从8.5 MPa降低到2 MPa，降低了76%；波速明显减小，从2 204 m/s减小至1 355 m/s，减小了40%；红层试样的pH与电导率变化也比较显著，pH值从8.77减小至7.29；电导率从55 ?s/cm增加到1 100 ?s/cm。
The holes caused by dissolution in red-bed soft rock are well developed in Chengdu. Submerging test, leaching test and dissolution test are performed with the samples of red-bed soft rock form different depth of Bandao City in Chengdu. Then the influencing on the environmental water and the erosion degree of soluble components in red bed soft rock containing saline deposit under different processes are analyzed after observing the dissolution characters and behaviors of rock sample under different environmental waters. The results show that the content of gypsum in red-bed soft rock rises with the depth increase. The causticity of rock and environmental water is significantly enhanced; the soluble components of red-bed soft rock dissolve and drain gradually under water, so as to turn to pore enlargement, permeability enhancement, strength reduction and lost of integrity; the acid environmental water makes the calcium carbonate cement drains faster and does great damage to the connection of structure, so as to influence the strength of red-bed soft rock obviously. The compressive strength, wave velocity of the rock are tested after submerging test, leaching test and dissolution test. The test results show that the uniaxial compressive strength of the soft rock reduces obviously after corroded by sulfuric acid. The uniaxial compressive strength reduces for 76% from 8.5 MPa to 2 MPa. The wave velocity in the rock also reduces for 40% from 2 204 m/s to 1 355 m/s. Meanwhile, the pH value of the rock reduces from 8.77 to 7.29 and its conductivity increases from 55 μs/cm to 1 100 μs/cm.
