为解决水泥固化剂加固软土强度不足、完整性差的缺陷，以珠海杧洲隧道软弱土层三轴搅拌加固工程为背景，引入新研发的软土固化剂对软土地层进行加固。通过分析工程特点及施工风险，结合室内试验、现场试验等手段对软土加固机制进行阐释，并通过设置室内试验固化剂与水泥掺量对照组，对7 d与28 d的无侧限抗压强度进行试验。结果表明： 1）龄期28 d固化剂13%掺量的固结体无侧限抗压强度为2.48 MPa，较水泥20%掺量强度增加91%； 2）经现场试桩取芯试验，固化剂三轴搅拌桩芯样完整，各深度的无侧限抗压强度值均大于设计要求（0.8 MPa），最小值为1.86 MPa，平均值为2.47 MPa，加固效果均满足设计要求； 3）相比水泥而言，可节约成本15%~30%。

To address the problems of soft soil cured by cement curing agent such as insufficient strength and poor integrity, a case study is conducted on Mangzhou tunnel in Zhuhai, China, and a newly developed soft soil curing agent is introduced to reinforce the soft soil layer. By analyzing the engineering characteristics and construction risks, the reinforcement mechanism of soft soil is explained by means of indoor and field tests. By setting the comparison indoor test between curing agent and cement content, the strength difference between the two is expounded through the 7and 28day unconfined compressive strength tests. The results show that: (1) The 28day unconfined compressive strength of the solidified body with 13% dosage of curing agent is 2.48 MPa, which is 91% higher than that with cement dosage of 20%. (2) The core sample of triaxial mixing pile reinforced by curing agent is complete, and the unconfined compressive strength values of each depth are greater than the design requirement of 0.8 MPa with a minimum value of 1.86 MPa and an average value of 2.47 MPa, fulfilling the design requirements. (3) The cost can be saved by 15%~30% compared with cement.