污水处理厂三期扩建工程勘察和设计-基坑支护计算书

PAGEPAGE1污水处理厂三期扩建工程勘察和设计基坑支护计算书目录227351.设计资料 2247432.设计依据 229083.基坑∅1200围护桩验算 3288523.1.临空7.6m桩基（嵌固端1m厚土层+5.5m厚岩层）验算： 3193803.2.临空7.6m桩基（嵌固端9.8m厚土层+5.5m厚岩层）验算 10100614.基坑坡率法放坡支护验算 18260235.基坑钢管桩支护验算（D299x10@600） 20128906.折背式挡墙验算 23污水处理厂三期扩建工程勘察和设计基坑支护计算书设计资料拟建污水处理厂三期扩建工程勘察和设计项目，本工程服务区域包括中和街道、乌杨街道、平凯街道以及规划的西部新城片区。一期规模为1.2万m3/d，二期规模为1.8万m3/d。秀山污水处理厂三期扩建工程，设计规模2.0万m3/d，位于秀山县梅江河下游迎风村牛石滩，紧临二期工程南侧空地，本工程新增用地红线面积为7756.0m2，折合11.64亩。本次设计范围为污水处理厂四周环境边坡支挡及场地内构筑物基坑边坡，环境边坡最大高度约4m，工程安全等级为二级，永久边坡设计工作年限为50年。在AO生物池北侧、东侧、南侧，高效沉淀池及滤布滤池西侧、北侧、南侧处产生深基坑，接触消毒池西侧、北侧、南侧，为土质深基坑，基坑最大深度约7.6m，工程安全等级为二级，临时边坡设计工作年限为2年。本项目基坑支护计算主要包括坡率法放坡稳定性验算、桩板挡墙结构验算及基坑钢管桩支护验算。本项目位于现状梅江河流域内，根据地勘报告，梅江河重现期50年洪水位为344.96m，50年洪水位高于部分水池基坑底，为保证基坑及主体施工安全，施工单位应做好施工组织安排，避开雨季施工，做好暴雨等极端天气预警；同时做好基坑施工过程的抽排水措施，基坑开挖回填需在1年内完成。故取天然岩土参数进行计算。设计依据《建筑边坡工程技术规范》(GB50330–2013)；《建筑地基基础设计规范》（GB50007-2011）；《建筑基坑支护技术规程》JGJ120-2012；《建筑抗震设计规范》GB50011–2010（2015年版）；《混凝土结构设计规范》GB50010–2010（2015年版）；《建筑边坡工程施工质量验收规范》DBJ/T50-100-2010；《关于进一步加强全市高切坡、深基坑和高填方项目勘察设计管理的意见》(渝建发（2010）166号)。《工程结构通用规范》（GB55001-2021）《建筑与市政工程抗震通用规范》（GB55002-2021）《建筑与市政地基基础通用规范》（GB55003-2021）《混凝土结构通用规范》（GB55008-2021）基坑∅1200围护桩验算临空7.6m桩基（嵌固端1m厚土层+5.5m厚岩层）验算基坑围护桩按照最不利临空7.6m计算，桩直径∅1200，桩间距4m。一、桩、板计算条件1.总控制信息路基型式路堑地区类型一般地区支护类型桩＋板结构重要性系数1.00抗震设计烈度(度)配筋计算水平地震系数Kh水上地震角(度)水下地震角(度)重要性修正系数Ci综合影响系数Cz2.坡线、土层和水位1)坡线信息坡线数1坡线水平投影竖向投影坡线长坡线仰角荷载数序号长(m)长(m)(m)(°)120.0000.00020.0000.0001坡线荷载：荷载荷载类型P1P2X1(m)X2(m)序号(kN,kN/m)(kN/m)1-1分布力10.00010.0000.00019.0002)土层信息桩前地面横坡无横坡桩前地面横坡角(度)0.000桩后横坡角(度)0.000结构与土摩擦角(度)12.500嵌固段以上土层数:1序号地层地层重度浮重度粘聚力内摩擦综合内摩土摩阻计算m,c,K承载KHηR类型厚(m)(kN/m3)(kN/m3)(kPa)角(°)擦角(°)力(kPa)方法力(kPa)(MPa)1土层7.60017.40020.7908.33050.000m法35.000130.000嵌固段土层数:3序号地层地层重度浮重度粘聚力内摩擦综合内摩土摩阻计算m,c,K承载KHηR类型厚(m)(kN/m3)(kN/m3)(kPa)角(°)擦角(°)力(kPa)方法力(kPa)(MPa)1土层1.00017.40020.7908.33050.000m法35.000130.0002岩层2.00024.2000.00040.00050.000K法120.000300.0000.5000.30010.0003岩层10.00026.9001309.00032.5001248.000K法300.0006798.0000.5000.30010.0003.计算模型1)桩前覆土模型：弹簧模型4.桩信息1)桩基本信息桩前地面以上长度(m)7.600嵌固点深度(m)0.000悬臂长度(m)7.600嵌固长度(m)6.500截面形状圆形桩径D(m)1.200桩中心距(m)4.000桩底支承条件自由坡线数12)桩配筋信息桩作用综合分项系数1.25桩混凝土强度等级C30桩纵筋合力点到外皮距离(mm)80桩容重(kN/m3)25.00桩纵筋级别HRB400桩箍筋级别HRB4005.板信息1)板尺寸信息桩间板类型直板桩间板的种类数1板的搭接长度(m)0.500板类型号板厚(mm)板宽(m)板块数13500.500152)板配筋信息板作用综合分项系数1.250混凝土强度等级C30钢筋合力点到边缘距离(mm)25板纵筋级别HRB400板选筋钢筋直径166.结构上自定义荷载以及荷载组合1)桩顶自定义荷载桩顶自定义荷载数：02)桩荷载组合[库仑土压力(一般)组合]荷载号荷载名称是否参与调整系数1桩自重√1.0002桩顶恒载√1.0003桩顶活载√1.0004桩后主动土压力√1.0002)板荷载组合[库仑土压力(一般)组合]荷载号荷载名称是否参与调整系数1板后主动土压力√1.000二、桩计算结果原始条件:钢筋混凝土配筋计算依据:《混凝土结构设计规范GB50010-2010》库仑土压力(一般情况)(一)桩身内力计算按实际墙背计算得到:第1破裂角：43.920(度)Ea=163.054(kN)Ex=159.189(kN)Ey=35.291(kN)作用点到嵌固点距离Zy=1.766(m)第1嵌固段地层计算方法:m法第2嵌固段地层计算方法:K法第3嵌固段地层计算方法:K法 背侧——为挡土侧；面侧——为非挡土侧。背侧最大弯矩=1881.071(kN-m)距离桩顶9.400(m)面侧最大弯矩=0.000(kN-m)距离桩顶0.000(m)最大剪力=637.486(kN)距离桩顶7.600(m)最大位移=-29(mm)点号距顶距离弯矩剪力位移土反力(m)(kN-m)(kN)(mm)(kPa)1-0.000-0.000-0.000-28.650.00020.200-0.000-0.000-28.040.00030.4000.000-0.000-27.430.00040.6000.000-0.000-26.820.00050.8000.000-0.000-26.210.00061.0000.000-0.000-25.600.00071.2000.000-0.000-24.990.00081.4000.000-0.000-24.380.00091.6000.000-0.000-23.770.000101.8000.000-0.000-23.160.000112.0000.000-0.000-22.550.000122.2000.000-0.000-21.940.000132.4000.000-0.000-21.330.000142.6000.000-0.000-20.720.000152.8000.179-2.683-20.110.000163.0001.311-8.931-19.500.000173.2003.869-16.938-18.890.000183.4008.204-26.707-18.280.000193.60014.669-38.235-17.670.000203.80023.615-51.525-17.070.000214.00035.396-66.575-16.460.000224.20050.362-83.385-15.850.000234.40068.867-101.956-15.240.000244.60091.262-122.288-14.630.000254.800117.900-144.380-14.030.000265.000149.131-168.232-13.420.000275.200185.310-193.846-12.820.000285.400226.787-221.219-12.220.000295.600273.915-250.353-11.630.000305.800327.046-281.248-11.030.000316.000386.532-313.904-10.440.000326.200452.725-348.320-9.860.000336.400525.977-384.496-9.280.000346.600606.640-422.433-8.710.000356.800695.068-462.130-8.150.000367.000791.610-503.589-7.590.000377.200896.620-546.807-7.050.000387.4001010.450-591.786-6.520.000397.6001133.452-637.486-6.00-0.000407.8001260.742-628.828-5.50-38.479418.0001384.983-607.322-5.01-70.138428.2001503.670-575.570-4.54-90.221438.4001615.211-539.432-4.09-92.281448.6001719.443-468.765-3.66-94.341458.8001802.717-338.969-3.26-390.922469.0001855.031-193.244-2.88-345.065479.2001880.015-65.102-2.52-302.116489.4001881.07146.616-2.18-262.116499.6001861.368143.079-1.88-225.068509.8001823.840225.449-1.59-190.9415110.0001771.189294.871-1.33-159.6775210.2001705.891352.463-1.09-131.1935310.4001630.204399.306-0.88-105.3895410.6001546.169449.234-0.68-82.1445510.8061447.697509.251-0.51-151.8765611.0121336.477561.488-0.35-104.4115711.2181216.495595.510-0.21-62.5055811.4241091.268613.480-0.09-25.6625911.629963.886617.3580.026.6396011.835837.061608.8860.1234.9256112.041713.168589.5950.2059.7236212.247594.287560.8000.2781.5486312.453482.250523.6140.34100.8946412.659378.681478.9530.39118.2256512.865285.035427.5490.45133.9736613.071202.632369.9690.50148.5256713.276132.694306.6300.54162.2266813.48276.372237.8220.58175.3646913.68834.768163.7240.63188.1747013.8948.95684.4360.67200.8287114.1000.00021.7510.71213.434桩底竖向合力=433.96(kN)，桩底面积A=1.131(m2)桩底所在土层承载力=6798.00(kPa)(二)桩身配筋计算点号距顶距离弯矩剪力全部纵筋箍筋(m)(kN.m)(kN)(mm2)(mm2/m)10.0001.0000.0006220100720.2001.0000.0006220100730.4001.0000.0006220100740.6000.0000.0006220100750.8000.0000.0006220100761.0000.0000.0006220100771.2000.0000.0006220100781.4000.0000.0006220100791.6000.0000.00062201007101.8000.0000.00062201007112.0000.0000.00062201007122.2000.0000.00062201007132.4000.0000.00062201007142.6000.0000.00062201007152.8000.224-3.35462201007163.0001.639-11.16362201007173.2004.836-21.17362201007183.40010.255-33.38362201007193.60018.336-47.79462201007203.80029.519-64.40662201007214.00044.245-83.21862201007224.20062.953-104.23162201007234.40086.084-127.44562201007244.600114.078-152.86062201007254.800147.375-180.47562201007265.000186.414-210.29062201007275.200231.637-242.30762201007285.400283.484-276.52462201007295.600342.394-312.94262201007305.800408.807-351.56062201007316.000483.165-392.38062201007326.200565.906-435.39962201007336.400657.471-480.62062201007346.600758.300-528.04162201007356.800868.834-577.66362201007367.000989.512-629.48662201007377.2001120.775-683.50963121007387.4001263.063-739.73371971007397.6001416.815-796.85881681007407.8001575.927-786.03591901007418.0001731.229-759.152102011007428.2001879.588-719.462111801007438.4002019.014-674.290121101007448.6002149.304-585.957129891007458.8002253.397-423.712136971007469.0002318.789-241.555141441007479.2002350.019-81.377143581007489.4002351.33958.271143671007499.6002326.710178.849141981007509.8002279.800281.8111387710075110.0002213.986368.5891342810075210.2002132.364440.5791287410075310.4002037.755499.1331223610075410.6001932.711561.5431153310075510.8061809.621636.5641071610075611.0121670.596701.860980510075711.2181520.619744.387883310075811.4241364.084766.850783310075911.6291204.858771.697683310076011.8351046.327761.108622010076112.041891.460736.993622010076212.247742.859701.000622010076312.453602.813654.518622010076412.659473.352598.691622010076512.865356.293534.436622010076613.071253.290462.461622010076713.276165.868383.288622010076813.48295.465297.277622010076913.68843.460204.655622010077013.89411.196105.545622010077114.1000.00027配筋面积最终结果：纵筋最大为14367(mm2)抗剪箍筋最大为1007(mm2/m)挡板计算结果土压力[板后土压力]按实际墙背计算得到:第1破裂角：43.920(度)Ea=163.054(kN)Ex=159.189(kN)Ey=35.291(kN)作用点到嵌固点距离Zy=1.766(m)板类型：直板取单位宽度板长计算板类型号:1板的计算长度l=4.000-1.200+0.500=3.300(m)板上荷载(取板段最大荷载力)：q=58.425(kN/m)板下缘距顶距离：7.500(m)板厚：b=350(mm)[内力计算]板上最大弯矩：M=ql2/8=79.531(kN·m)板上最大剪力：V=ql/2=96.401(kN)板上支座反力：F=ql/2=96.401(kN)[混凝土抗剪计算]板作用综合分项系数：ks=1.250剪力设计值：V=120.501(kN)V<=0.7ftbh0=0.7×1.430×500.000×325.000=162662.484(N)=162.662(kN)混凝土抗剪满足要求[配筋计算]板作用综合分项系数：ks=1.250弯矩设计值：M=99.413(kN·m)计算配筋面积：As=880(mm2)板宽：B=0.500(m)单块板上配筋面积：As=AsB=440(mm2)控制配筋结果板类型号 单块板计算配筋面积(mm2)1 440挡板断缝处验算本项目基坑支护桩桩径为1.2m，最大桩心间距为4m，挡板断缝处挡板为1.4m高悬臂墙，挡板最深为现状地面以下7.6m，计算条件：荷载条件:均布恒载标准值:0.00kN/m活载准永久值系数:0.50均布活载标准值:0.00kN/m支座弯矩调幅系数:100.0%梁容重:25.00kN/m3计算时考虑梁自重:不考虑恒载分项系数:1.25活载分项系数:1.00计算简图：计算内力：根据计算，挡板配筋面积为700mm²，实际配筋为5E16(1005.5mm²),实际配筋面积1005.5mm²＞700mm²。综上，挡板断缝处设置满足规范要求。地基横向承载力计算：根据设计图纸，嵌入稳定岩层内最不利桩长为6.5m，1/3（即基坑底下2.2m）处地基横向承载力为3777KPa（如下表）大于桩在该处的最大横向压应力190.941KPa，满足规范要求。经过计算，基坑支护桩板挡墙满足规范要求。3.2.临空7.6m桩基（嵌固端9.8m厚土层+5.5m厚岩层）验算基坑围护桩按照最不利临空7.6m计算，桩直径∅1200，桩间距4m。桩、板计算条件1.总控制信息路基型式路堤地区类型一般地区支护类型桩＋板结构重要性系数1.00抗震设计烈度(度)配筋计算水平地震系数Kh水上地震角(度)水下地震角(度)重要性修正系数Ci综合影响系数Cz2.坡线、土层和水位1)坡线信息坡线数1坡线水平投影竖向投影坡线长坡线仰角荷载数序号长(m)长(m)(m)(°)120.0000.00020.0000.0001坡线荷载：荷载荷载类型P1P2X1(m)X2(m)序号(kN,kN/m)(kN/m)1-1分布力10.00010.0000.00019.0002)土层信息桩前地面横坡无横坡桩前地面横坡角(度)0.000桩后横坡角(度)0.000结构与土摩擦角(度)12.500嵌固段以上土层数:1序号地层地层重度浮重度粘聚力内摩擦综合内摩土摩阻计算m,c,K承载KHηR类型厚(m)(kN/m3)(kN/m3)(kPa)角(°)擦角(°)力(kPa)方法力(kPa)(MPa)1土层7.60017.40020.7908.33050.000m法35.000130.000嵌固段土层数:3序号地层地层重度浮重度粘聚力内摩擦综合内摩土摩阻计算m,c,K承载KHηR类型厚(m)(kN/m3)(kN/m3)(kPa)角(°)擦角(°)力(kPa)方法力(kPa)(MPa)1土层9.80017.40020.7908.33050.000m法35.000130.0002岩层2.20024.2000.00040.00050.000K法120.000300.0000.5000.30010.0003岩层10.00026.9001309.00032.5001248.000K法300.0006798.0000.5000.30010.0003.计算模型1)桩前覆土模型：弹簧模型4.桩信息1)桩基本信息桩前地面以上长度(m)7.600嵌固点深度(m)0.000悬臂长度(m)7.600嵌固长度(m)15.300截面形状圆形桩径D(m)1.200桩中心距(m)4.000桩底支承条件自由坡线数12)桩配筋信息桩作用综合分项系数1.25桩混凝土强度等级C30桩纵筋合力点到外皮距离(mm)80桩容重(kN/m3)25.00桩纵筋级别HRB400桩箍筋级别HRB4005.板信息1)板尺寸信息桩间板类型直板桩间板的种类数1板的搭接长度(m)0.500板类型号板厚(mm)板宽(m)板块数13500.500152)板配筋信息板作用综合分项系数1.250混凝土强度等级C30钢筋合力点到边缘距离(mm)25板纵筋级别HRB400板选筋钢筋直径146.结构上自定义荷载以及荷载组合1)桩顶自定义荷载桩顶自定义荷载数：02)桩荷载组合[库仑土压力(一般)组合]荷载号荷载名称是否参与调整系数1桩自重√1.0002桩顶恒载√1.0003桩顶活载√1.0004桩后主动土压力√1.0002)板荷载组合[库仑土压力(一般)组合]荷载号荷载名称是否参与调整系数1板后主动土压力√1.000原始条件:库仑土压力(一般情况)(一)桩身内力计算按实际墙背计算得到:第1破裂角：43.920(度)Ea=163.054(kN)Ex=159.189(kN)Ey=35.291(kN)作用点到嵌固点距离Zy=1.766(m)第1嵌固段地层计算方法:m法第2嵌固段地层计算方法:K法第3嵌固段地层计算方法:K法 背侧——为挡土侧；面侧——为非挡土侧。背侧最大弯矩=2250.839(kN-m)距离桩顶10.800(m)面侧最大弯矩=60.477(kN-m)距离桩顶19.200(m)最大剪力=635.999(kN)距离桩顶7.600(m)最大位移=-50(mm)点号距顶距离弯矩剪力位移土反力(m)(kN-m)(kN)(mm)(kPa)1-0.0000.0000.000-50.100.00020.200-0.0000.000-49.160.00030.4000.000-0.000-48.210.00040.6000.000-0.000-47.260.00050.8000.000-0.000-46.310.00061.0000.000-0.000-45.360.00071.2000.000-0.000-44.420.00081.4000.000-0.000-43.470.00091.6000.000-0.000-42.520.000101.8000.000-0.000-41.570.000112.0000.000-0.000-40.620.000122.2000.000-0.000-39.670.000132.4000.000-0.000-38.730.000142.6000.000-0.000-37.780.000152.8000.179-2.683-36.830.000163.0001.311-8.931-35.880.000173.2003.869-16.938-34.930.000183.4008.204-26.707-33.980.000193.60014.669-38.235-33.040.000203.80023.615-51.525-32.090.000214.00035.396-66.575-31.140.000224.20050.362-83.385-30.190.000234.40068.867-101.956-29.250.000244.60091.262-122.288-28.300.000254.800117.900-144.380-27.360.000265.000149.131-168.232-26.410.000275.200185.310-193.846-25.470.000285.400226.787-221.219-24.540.000295.600273.915-250.353-23.600.000305.800327.046-281.248-22.670.000316.000386.532-313.904-21.740.000326.200452.725-348.320-20.820.000336.400525.977-384.496-19.900.000346.600606.640-422.433-18.990.000356.800695.068-462.130-18.090.000367.000791.610-503.589-17.200.000377.200896.620-546.807-16.320.000387.4001010.450-591.786-15.450.000397.6001133.452-635.999-14.59-0.000407.8001260.146-616.422-13.75-86.101418.0001380.021-581.915-12.92-88.161428.2001492.912-546.593-12.11-90.221438.4001598.658-510.456-11.32-92.281448.6001697.094-473.502-10.56-94.341458.8001788.059-435.733-9.81-96.401469.0001871.388-397.149-9.09-98.461479.2001946.918-357.748-8.39-100.521489.4002014.487-317.532-7.72-102.580499.6002073.931-276.500-7.08-104.640509.8002125.087-234.653-6.46-106.7005110.0002167.792-191.989-5.87-108.7605210.2002201.883-148.511-5.31-110.8205310.4002227.197-104.216-4.77-112.8805410.6002243.570-59.106-4.27-114.9405510.8002250.839-13.179-3.79-117.0005611.0002248.84133.562-3.35-119.0605711.2002237.41481.120-2.93-121.1195811.4002216.393129.493-2.55-123.1795911.6002185.617178.682-2.19-125.2396011.8002144.921228.687-1.86-127.2996112.0002094.142279.507-1.56-129.3596212.2002033.118331.143-1.29-131.4196312.4001961.685383.595-1.04-133.4796412.6001879.680436.862-0.82-135.5396512.8001786.940486.107-0.62-113.1666613.0001685.237525.306-0.45-84.8086713.2001576.817553.651-0.30-58.3526813.4001463.776571.932-0.17-33.9726913.6001348.045580.993-0.06-11.7927013.8001231.379581.7220.048.1127114.0001115.356575.0240.1125.7137214.2001001.369561.8100.1841.0227314.400890.632542.9790.2354.0867414.600784.178519.4030.2764.9857514.800682.871491.9190.2973.8257615.000587.411461.3160.3180.7327715.200498.344428.3330.3285.8517815.400416.077393.6450.3389.3397915.600340.886357.8670.3391.3608015.800272.931321.5460.3292.0808116.000212.268285.1640.3191.6698216.200158.865249.1360.3090.2908316.400112.614213.8150.2988.0998416.60073.340179.4930.2785.2438516.80040.816146.4070.2581.8588617.00014.776114.7430.2478.0628717.200-5.08184.6420.2273.9608817.400-19.08060.7270.2069.6368917.600-29.37247.0330.1922.3409017.800-37.89438.5780.1720.3639118.000-44.80330.8950.1518.4459218.200-50.25223.9560.1416.5979318.400-54.38617.7340.1214.8279418.600-57.34512.1960.1113.1439518.800-59.2647.3070.1011.5499619.000-60.2683.0310.0810.0489719.200-60.477