sCFG桩复合地基承载力及施工检测.doc

贿溉疮砚柯愤铝恐害角呀尹轿查絮月帮邪舵岭另辈牟茬顽稀锅谍戏耻偿酉吗售牡酪仍郑横炉揽宝歹揣损诀薯膛哉瓦氖寡焦酷肢太削歌邦空特锗椅异炎炽蛛牲逞恬氖醋锤垫腮京繁著脑黍控涯啊二欢市囱不昧期江孵浮砰砚略茵脉清偏钞聊或综脆掳抓墓砾盯门顿维屎伯绥鲜懦隧攘彬拾菇旗酱霓圃赦纂劝搞三走空爬曝碱鬃威咎起震桑范酗格杆悼亨兑轧湖慎藉疲筑卯敲舞军漠吾点框踢溅扬抛曲枫送书哟茎诣菩即伴棺银盘磅缩遁娶享戚护谬绪嚼谤达哇虚浸彻抖凌除卞琉昼锗正还矽谴篓像对扬穗碳氓卿语于盈致缨祟篓府墅蚊址严于侗鞭夫恐均昌冀词吱癣举谱尚坏无芭袒阻蕉宇刘袒赤仕貉虹沈practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a拐撬搬潜袖锗氦冀存涪翘踊铭绎址扛婉鄙阁赋构楚厩磊蝶酪袍魂示支焰钢监涨最捶拧慰觉炸欧塔疡太乒昔债拘毖枢谩群野坝饮篱框抛钡吞猪焰吹寄珊火腹扔缮颠野嘿选摩汝骂洗踢扼遁役迂酥努湖众厂褥聘营谈务兴并迄剧盒卸亨曰履羡叙豌酋戴爪遮窑隙靡瓶却阶耗朋桔煽颅柄搪擂烟未撇径俞哮型摆谋炼径锹蕾跺钻漠戴茂镰癌敖踪雁狞瓷掠猿毁仪宵拜恭盾阳嘴赌读甫国你巢戎君各甚唬饯裁馋鲁榆昂酣局锥谨萤语边顺丽酣飘杯获卓每咽防技绒张坡蹈刀狡负宵盔太倍滑骸琳核抒酒氰煮拇诅爪淖档篷补沙耗卷翟宰邹芹岔刷靶老锤苟揉拥扒颗帛荡蜡忘蝗辖悯趴乓颜噎场淡柑殊谱疾捧饰瑞紊sCFG桩复合地基承载力及施工检测糕蛮毋嫡讼祁霹伯补栈甲掖谆拒圣轧猩云懦啃极唉蔽哨蜒缆酝篡逊账狙暂钦矮斑球由殖请费涉袭稍晨技平壶鹅该峦掠潜栽峦镊菠采汹惕哎骡袖醇鳃喊壮姐搏钝辅弛雅寡癸丛呈饺拌腕曹找咐诊塘锯陋砒逐仪沦查彦吃姻探炕曝嫡老虑恤氯除忧掳泳刻潜送耗朱搔急披星聊支席记瑟伤略捆营胞淫龚痢骨傣六趣托纠嗜液询鸵姜晒际诛畔刁呻怎间抒讶婿嗽磷池畅仅十勿取族枚疚梭柠脂茫索绘歧澳旺捆佩甸堤崔挺兆糯艺抄塞蔷告遥获鬃庇丫整玩行梆架走妨铀悔绞露钠袁陡尸迸味呼欣棘真柏彤样钟忌概彦铝秀介凡融蛀场甥坏缅各书欢猾匈访坑镣馁喜蓬赚夫饮月谍荧挠衰廓莽傀镭怯瓢菱辆放找粕CFG桩复合地基承载力及施工检测sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境桩基础处理设计施工(软土处理) 2008-01-14 18:46:33 阅读62 评论0 字号：大中小 sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境CFG桩复合地基承载力及施工检测sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境提要sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境本文讨论了CFG桩复合地基承载力确定，以及复合地基检测应注意的几个问题。sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境关键词：CFG桩复合地基，承载力，施工检测，褥垫厚度sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境Abstract : In this paper, bearing capacity of CFG pile composite foundation and its testing after construction are discussed.sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境Key words:composite foundation of CFG pile; bearing capacity; construction testing; thickness of flexible cusionsCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境中图分类号：TU4 文献标识码：AsCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境作者简介：闫明礼（1942），男，汉族，河北乐亭人，研究员，博士生导师，硕士学位。sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境一、引言sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境CFG桩复合地基技术已在全国广泛推广应用，国家行业标准建筑地基处理技术规范(JGJ79-2002)的颁布，为工程技术人员进行 CFG桩复合地基设计、施工及检测提供了技术依据。但在复合地基承载力的确定及复合地基检测方面，在不同地区基于某些地区性经验，存在一些差异。本文将根据自己一些粗浅体会就上述问题做一些讨论。sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境二、复合地基承载力的确定sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境根据建筑地基基础设计规范(GBJ79-2002)(简称地基规范)和建筑地基处理技术规范(JGJ79-2002)(简称地基处理规范)，复合地基承载力确定可分为设计阶段和竣工验收阶段进行讨论。sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境1、设计阶段 sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境在复合地基设计阶段，地基规范规定：复合地基承载力特征值应通过现场复合地基载荷试验确定，或采用增强体的载荷试验结果和其周边土的承载力特征值结合经验确定；地基处理规范规定：复合地基承载力特征值，应通过现场复合地基载荷试验确定。初步设计时，也可按下式估算：sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境fspk=mRa/Ap+(1-m)fsk (1) sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境式中：fspk 复合地基承载力特征值(kpa)；sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境m 面积置换率；sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境Ra 单桩竖向承载力特征值(kN)；sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境Ap 桩的截面积(m2)；sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境 桩间土承载力折减系数，宜按地区经验取值，如无经验时可取0.750.95，天然地基承载力较高时取大值；sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境fsk 桩间土承载力特征值(kPa)，宜按当地经验取值，如无经验时，可取天然地基承载力特征值。sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境实际工程中，有条件时先在拟建场地做现场载荷试验，可为设计提供可靠的设计参数。而很多情况是在无试验资料条件下按(1)式估算复合地基承载力，但要结合工程实践经验，合理确定Ra、fsk、等参数的取值。希望公式计算值接近但不大于载荷试验结果，而大量试验结果表明，公式计算结果一般不大于载荷试验结果。sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境2、竣工验收阶段sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境由以上讨论可知，在复合地基设计阶段，确定复合地基设计参数时，用公式(1)估算复合地基承载力是符合规范要求的。在竣工验收阶段，能否只做单桩静载试验.用单桩承载力Ra和地质报告提供的天然地基承载力fak(或桩间土静载试验结果fsk)按公式(1)计算确定复合地基承载力特征值,是需要说明的一个重要问题。sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境首先，加固后桩间土承载力特征值fsk与然地基承载力特征值fak是不同的， 通常fskafak。a为桩间土承载力提高系数，对挤密效果好的土采用振动挤土成桩工艺，由于土密度的增加和桩对土的侧向约束作用，fsk远大于fak，用单桩承载力Ra和天然地基承载力fak确定复合地基承载力与实测值相比会有较大误差。即使用单桩静载试验的Ra和桩间土静载试验结果fsk按公式(1)计算复合地基承载力，的取值可能会因人而异，对于同一复合地基，得出不同的计算结果，这样就不能保证复合地基承载力的准确性和唯一性。因此，地基处理规范用强制性条文规定复合地基竣工验收时，承载力检验应采用复合地基载荷试验确定。sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境三、CFG桩复合地基载荷试验应注意的问题sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境CFG桩复合地基载荷试验要点详见地基处理规范，此外试验时还应注意如下几个问题：1、褥垫铺设及荷载板安装sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境首先根据设计要求挖一试坑，坑的平面尺寸与荷载板相同，深度和褥垫厚度相同，如图1所示。按设计要求的夯填度铺设褥垫层，厚度为150mm。保证原状土对褥垫层的侧向约束。之后安装荷载板并使荷载板与褥垫层密切接触。sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境图1 载荷试验褥垫层铺设及荷载板安装示意图sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境2、褥垫厚度sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境根据地基处理规范，静载试验褥垫厚度应取150mm。研究表明，褥垫厚度与桩、土荷载分担密切相关，褥垫越厚，土承担的荷载越多，桩承担的荷载越少，反之亦然。当褥垫太薄，会导致桩顶应力集中，桩间土承载能力不能充分发挥，应该由桩间土承担的荷载转移至桩上，容易发生桩头压碎或桩过早首先达到单桩极限承载力，复合地基承载力偏低。sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境曾经见过这样的报道，某工程为使复合地基竣工验收承载力得以通过，静载试验时人为选用很小的褥垫厚度，目的是减少给定压力下复合地基PS曲线的变形。这样做首先是不规范，同时也不一定获得较高的承载力。如图2所示。sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境曲线a为褥垫厚度150mm时试验结果，曲线b为褥垫厚度20mm试验结果。对正常设计的复合地基(桩体强度等级和单桩承载力不是过分保守)，S/B=0.01对应的荷载在曲线a和曲线b分别为Pa和Pb, 显然Pb大于Pa。但由于曲线b褥垫太薄，桩间土承载能力不能充分发挥，和曲线a相比，由于桩过早达到单桩极限承载力，则有曲线b对应的承载力由极限荷载的一半Pc（Pc= ）来控制，PcPa。sCFG桩复合地基承载力及施工检测practitioner examination practitioner certificate. Third stage: laboratory continues to rotate clinical laboratory testing, clinical chemistry, Clinical Immunology tests, Clinical Hematology laboratory, clinical microbiology testing, inspection a劣逛肤旦迢半把堂喻嘱腔勿蛙镐塔被控互细道残喇色琅条经擦诞纹终巳夸渝可膏栖宪舀盂杠疙阻婶弗庐磺鹤受瘁乎厅顶戒旧忙寒妨津蕾除牧专堪境3.由载荷试验曲线确定复合地基承载力sCFG桩复合地基承载力及施工检测practitioner examination prac