推荐回答（1个）
一、高压旋喷桩试桩参数确定 二、工程概况 1、工程概述 DK70+260京山中桥改造桥台帮宽采用高压旋喷桩对地基进行加固，高压旋喷桩桩径0.5m，桩间距为1.1m，梅花形布置。高压旋喷桩设计数量140颗，共计3710m。 2、工程地质及水文地质概况 表层为人工填土,厚约1.2m～3.0m;其下为中砂~粉砂,褐灰灰白色,中密饱和,厚度12～14m，σ0=160kPa; 中间为淤泥质粘土,褐色,软～流塑,厚度约为10～12m,天然含水量ω=50.20%,σ0=70kPa;次下面为全风化含砾砂岩, σ0=300kPa;最下层为强风化含砾砂岩,σ0=500kPa. 水文地质条件：地下水较发育,主要为孔隙潜水，多赋存于砂类土中，埋深较浅，水量较大；基岩裂隙水不发育，埋藏深。 三、设计要求 根据《铁路工程地质勘察规范》附录F及《岩土工程勘察规范》腐蚀性评价标准判定，地下水环境具弱酸性化学侵蚀作用，环境作用等级为H1，地表水环境无化学侵蚀作用。DK70+2620京山中桥改造桥台帮宽采用高压旋喷桩复合地基，桩径d=0.5m，间距D=1.1m，梅花形布置，桩长应穿透软弱土层（压缩层）到达无压缩层（硬层）以下0.5m，桩体采用强度等级为PO32.5级普通硅酸盐水泥，水灰比1:1，高压旋喷桩的水泥掺入量不小于200Kg/m。施工前通过工艺性试桩确定该地的成桩经验及各种操作技术参数，试桩数量不少于3根。 四、试桩目的 1、确定水泥浆经输浆管到达高压旋喷桩喷浆口的时间。 2、确定钻杆下钻速度、提升速度。 3、确定水泥浆的配合比及水泥浆比重。 4、根据水泥的不同掺入量确定各项技术参数。 5、确定针对本工程的施工质量检验标准评价依据。 6、检验施工设备及选定的施工工艺。 五、试桩方案 DK70+260京山中桥改造桥台帮宽采用高压旋喷桩地基加固，施工前必须进行成桩工艺试验，确定各项技术参数，检验成桩效果。每米水泥用量不小于200kg, 要求无侧限抗压强度≥2.6MPa。根据以往施工经验综合考虑，拟采用的参数：水灰比为1：1，试桩3颗，水泥采用等级为PO.32.5的普通硅酸盐水泥，转速控制在15～20r/min，注浆压力不小于20Mpa，进行3根桩的成桩工艺性试验，经钻芯取样检验桩的完整性、均匀性、无侧限抗压强度满足设计要求后，确定各项工艺参数，方可进行大面积桩施工。
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