《桩侧摩阻力计算》
一、 工程概况：
本工程①杂填土、②淤泥均为欠固结软弱土应计算桩侧负摩阻力。根据岩土工程勘察报告ZK65揭示地基土分层如下：（孔口标高5.07m，地下水位标高2.02m）
第1 层杂填土底部标高2.77（厚度2.30）
第2 层淤泥底部标高-7.53（厚度10.30）
第3 层卵石底部标高-12.43（厚度4.90）
第⑤层砂土状强风化凝灰岩底部标高-14.73（厚度2.30）
第⑥层碎块状强风化凝灰岩…………
该位置软弱土层较厚且土层分布具有代表性，所以计算该位置的桩侧负摩阻力值。
二、 计算过程
(1) 根据JGJ94-2008第5.4.4条桩侧负摩阻力标准值按下式计算：
![](https://wkrtcs.bdimg.com/rtcs/image?w=81&md5sum=d77d019f674165a9f3ebb0c8886a9c91&sign=4e0cd8981b&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=475&ipr={"t":"img","w":"81","h":"31","c":"4f33c14275721793bb6338ada31ed0a1.png"})
根据地勘报告杂填土和淤泥的负摩阻力系数分别为0.4和0.25，素填土和淤泥的重度为16.0kN/m3。
![](https://wkrtcs.bdimg.com/rtcs/image?w=23&md5sum=d77d019f674165a9f3ebb0c8886a9c91&sign=4e0cd8981b&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=475&ipr={"t":"img","w":"23","h":"27","c":"1e1680461e1a2d74621896c676edbe34.png"})
![](https://wkrtcs.bdimg.com/rtcs/image?w=23&md5sum=d77d019f674165a9f3ebb0c8886a9c91&sign=4e0cd8981b&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=475&ipr={"t":"img","w":"23","h":"31","c":"ee4ec574e963c8d459a719ca3605f1a2.png"})
![](https://wkrtcs.bdimg.com/rtcs/image?w=28&md5sum=d77d019f674165a9f3ebb0c8886a9c91&sign=4e0cd8981b&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=475&ipr={"t":"img","w":"28","h":"31","c":"31c7969f3e74151c05a8d7106c64efbc.png"})
![](https://wkrtcs.bdimg.com/rtcs/image?w=28&md5sum=d77d019f674165a9f3ebb0c8886a9c91&sign=4e0cd8981b&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=475&ipr={"t":"img","w":"28","h":"31","c":"435312772a8f3018bf9c94eb2b865f39.png"})
(2) 桩持力层为⑤砂土状强风化凝灰岩，根据持力层性质中性点深度比![](https://wkrtcs.bdimg.com/rtcs/image?w=44&md5sum=d77d019f674165a9f3ebb0c8886a9c91&sign=4e0cd8981b&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=475&ipr={"t":"img","w":"44","h":"23","c":"5a6d6faa94cd095cad7af22f020f45a5.png"})
![](https://wkrtcs.bdimg.com/rtcs/image?w=48&md5sum=d77d019f674165a9f3ebb0c8886a9c91&sign=4e0cd8981b&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=475&ipr={"t":"img","w":"48","h":"23","c":"78e7761fcb3cd9c09af1da7e2ea522d7.png"})
(3) 计算桩下拉荷载标准值。
根据JGJ94-2008第5.4.4-4条
![](https://wkrtcs.bdimg.com/rtcs/image?w=145&md5sum=d77d019f674165a9f3ebb0c8886a9c91&sign=4e0cd8981b&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=475&ipr={"t":"img","w":"145","h":"68","c":"2ef76c31935118ff00a36614feb98fdc.png"})
![](https://wkrtcs.bdimg.com/rtcs/image?w=25&md5sum=d77d019f674165a9f3ebb0c8886a9c91&sign=4e0cd8981b&rtcs_flag=1&rtcs_ver=4&l=webapp&bucketNum=475&ipr={"t":"img","w":"25","h":"36","c":"b32d0268145af65d161bb0084e083409.png"})
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