在软土地区开展桩基工程建设，桩基水平承载力的确定是一个亟待解决的问题。以Matlock软黏土p-y曲线为基础，提出Matlock p-y曲线的双折线简化模型，进而采用不排水抗剪强度指标su和静力触探锥尖阻力qc对双折线简化模型参数kini、pu进行表征。以无量纲桩土相对刚度系数KR作为刚、柔性桩划分标准，并分别建立了初始切线模量系数KE与KR、水平土抗力系数KC与KR的关系，最后提出了软土地基刚、柔性桩水平承载位移控制标准。结果表明：提出的位移控制标准可以快速确定桩基临界水平承载力，是一种实用、可靠的桩基水平承载判别方法。

The determination of lateral force capacity of piles is a problem to be solved in construction of soft soil area. Based on the Matlock p-y curve used in soft clay, a simplified double broken line model of Matlock p-y curve was proposed, and then the undrained shear strength index su and CPT cone tip resistance qc were used to represent the model parameter kini and pu . The dimensionless relative stiffness coefficient of pile and soil, noted as KR, was used as a classification standard to differentiate rigid pile and flexible pile. The relationships between the initial tangent modulus coefficient denoted KE and the horizontal soil resistance coefficient denoted KC were established. At last, the displacement standards for lateral capacity of rigid pile and flexible pile in soft soil foundation were developed. Results show that the displacement control standards can quickly determine the pile critical lateral capacity. it demonstrates a practical and reliable method of evaluating lateral capacity of pile foundation.