（1 中南大学土木建筑学院，长沙 410075；2 长沙市勘测设计研究院，长沙 410007）

［摘要］应用剪切试验、基岩内桩侧摩阻力试验和高压旁压试验及桩身应力测试，对湘浏盆地内泥质粉砂岩的嵌岩段桩侧阻力的研究表明，按《建筑桩基技术规范》（JGJ94—94）确定的侧阻力偏低，分析了不同方法确定的结果差异的根源，提出了以单轴天然抗压强度标准值为基础，按0.15～0.30系数折减计算嵌岩段极限侧阻力的取值标准，对类似地区桩基设计有一定的参考价值。

［关键词］软岩嵌岩桩；红层；嵌岩段侧阻力

Test study on lateral resistance of rock-socket in red beds

Peng Baixing 1,2, Wang Xinghua 1, Yin Changjun 1

 (1 Civil Architectural Engineering College, Central South University, Changsha 410075, China;

 2 Institute of Investigation & Design, Changsha 410007, China）

Abstract:Test study is made on the lateral resistance of socketed pile in argillaceous siltstone in Xiangliu basin, which includes straight shear test, side resistance test in rock, high pressure pressurement test (PMT) and stress detector. Through the testing and analysis, it is found that the side resistance of red beds evaluated with Technical Code for Building Pile Foundation(JGJ94—94) is quite lower. And then the difference and influence factors for test results have been discussed also. An improved parameter formula is given to calculate the side resistance of embedded section with uniaxial compressive strength standard value under natural moisture, and its reduced coefficient is 0.15 to 0.30. The results is deserved to be applied to practical problems such as those on soft rocks.

Keywords:socketed pile in soft rock; red beds; side resistance of rock-socketed pile