桩身应力测试报告.doc

第一章 工程概况一、工程概述工程名称工程地点委托单位建设单位勘察单位设计单位基桩施工单位监理单位检测目的测试桩身轴力与桩侧摩阻力检测依据规范JGJ106-2003结构类型剪力墙层数46、32和30层桩型钻孔灌注桩桩径（mm）800设计桩长57.0m、67.0m和80.0m桩端持力层粉质粘土、细砂试桩总数14棵施工日期2008.1.312.10检测桩数9棵检测日期2010.3.33.26砼强度等级C35抽测类型部分检测单桩竖向抗压拔承载力特征值6000 kN要求最大加载值12000 kN检测方法静载荷慢速维持荷载法过程中测量钢筋应力计备注检测现场温度、湿度满足检测要求，无强振动、强磁场等干扰；其中8#11#楼46层，13#14#楼32层，12#楼30层。二、工程地质条件（工程地质柱状图）根据*院提供的岩土工程勘察报告，该场地工程地质条件如下：三、检测桩位示意图四、钢筋应力计在桩身埋设位置示意图钢筋应力计在各试桩中位置示意图钢筋应力计埋设位置表序号检测面编号80m桩埋设深度67m桩埋设深度57m桩埋设深度备 注1J11.81.81.8为标定断面2J29.49.49.4各深度均为桩顶面往下计算3J314.314.314.34J423.323.323.35J530.130.130.16J636.536.536.57J73939398J845.745.745.79J951.751.751.710J1057.557.55757m桩桩端压力盒11J117063.512J1273.66767m桩桩端压力盒13J1377.514J1479.880m桩桩端压力盒检测桩号1#、3#、4#6#、7#、8#9#、10#、11#第二章 桩身内力测试一、检测目的本次检测目的是测定在各级荷载作用下桩身不同位置的轴力和桩侧摩阻力的分布情况。二、测试设备及钢筋测力计的埋设1、每桩钢筋应力计设置在各土层交界面处，每一个截面设2只钢筋测力计（基本呈180对称布置），各钢筋应力计埋设截面的平、剖面图如前图；2、JTM-V1000振弦式钢筋应力计采用焊接法固定在钢筋笼主筋上，并与桩身纵轴线平行；3、连接在应力计的电缆线用柔性材料保护，绑扎在钢筋笼内侧并引至地面；4、所有应力计均用明显标记编号；5、仪器设备：检测仪器设备采用JTM-V1000振弦式钢筋应力计、JTM-V10B型频率读数仪、集线箱等组成。三、测试原理1、假定：同一截面钢筋与混凝土的变形协调；桩顶下砼弹性模量相同；位于桩顶面以下1.8m处的J1截面所受轴力与静载荷试验的加载量相同；2、桩身范围内砼弹性模量Ecij的确定：将J1截面作为标定截面(i=1)，量测该截面钢筋应力计在包括预压的各级荷载作用下频率变化值，用此推算各载荷等级下钢筋应变s1j，由于假定砼与钢筋协同受力，不出现裂缝，故砼应变c1j=s1j，由此可以算出各载荷等级下桩身砼的弹性模量Ec1j。利用钢筋应变s1j与桩身砼的弹性模量Ec1j的两组数据可以拟合出关于两者之间的相关关系，根据其余各截面在各载荷等级下钢筋应变sij，再通过其相关关系可以得到各截面在各载荷等级下的Ecij；3、某一截面桩身轴力PZj计算公式为：式中： Ecj、Esj 砼弹性模量、钢筋弹性模量Es取2.0108(kPa) Acj、Asj 同一截面处砼面积、钢筋总面积。cj、sj同一截面处砼与钢筋的应变4、钢筋应力计受力的计算公式：式中： PSij第i量测截面处在j级荷载下应力计所受轴向力（kN） Fij第i量测截面处在j级荷载下应力计的实测频率值(Hz) Fi0i截面处钢筋应力计的初始频率值（Hz）K应力计标定系数 Asi第i量测截面应力计面积(cm2)5、第i量测截面处在第j级荷载下的桩身轴力：6、桩侧摩阻力计算fij：式中：fiji截面至i+1截面之间在第j级荷载量下的桩侧摩阻力(kPa) Piji截面在j级荷载量下的轴力(kN)Aii截面至i+1截面之间的桩侧面积(m2)四、测试步骤1、将弦式钢筋应力计按产品使用要求预埋在试桩桩身指定位置；2、弦式钢筋应力计宜放在两种不同性质土层的界面处，以测量桩在不同土层中的分层摩阻力。在地面处(或以上)应设置一个测量断面作为钢筋应力计传感器标定断面。钢筋应力计埋设断面距桩顶和桩底的距离不宜小于1倍桩径。在同一断面处对称设置2个钢筋应力计。钢筋计应按主筋直径大小选择。仪器的可测频率范围应大于桩在最大加载时的频率的1.2倍；3、使用前应对钢筋计逐个标定，得出压力(拉力)与频率之间的关系。带有接长杆弦式钢筋计可焊接在主筋上；弦式钢筋计通过与之匹配的频率仪进行测量，频率仪的分辨力应优于或等于1Hz；4、在载荷试验时进行桩身内力测试。五、实测曲线1#桩桩身轴力分布图 1#桩桩身侧摩阻力分布图3#桩桩身轴力分布图 3#桩桩身侧摩阻力分布图4#桩桩身轴力分布图 4#桩桩身侧摩阻力分布图6#桩桩身轴力分布图 6#桩桩身侧摩阻力分布图7#桩桩身轴力分布图 7#桩桩身侧摩阻力分布图8#桩桩身轴力分布图 8#桩桩身侧摩阻力分布图9#桩桩身轴力分布图 9#桩桩身侧摩阻力分布图10#桩桩身轴力分布图 10#桩桩身侧摩阻力分布图11#桩桩身轴力分布图 11#桩桩身侧摩阻力分布图六、检测成果汇总1#桩身轴力数据表(kN)截面序号深度加载等级123456789J11.8 24003600480060007200840096001080012000J29.4 2017.33052.84078.15078.96225.27457.38652.89859.111060J314.3 1593.62593.73476.34271.65348.86523.67695.78891.210050.4J423.3 912.61831.32547.33109.34111.65201.26298.37401.58252.3J530.1 732.31469.32153.72533.23401.74392.35451.36505.47106.3J636.5 623.41109.31710.32053.22872.33837.34781.75750.26122.1J739.0 584.3979.61555.21857.72646.53551.24482.15405.75683.6J845.7 263.7415.7796.31072.51721.32503.33259.24033.44258.2J951.7 186.2306.3573.6833.51375.32115.22721.63302.63505.3J1057.2 73.7122.1292.6495.8943.71478.61981.72425.92592.6J117018.930.548.672.4229.1378.3429.7527.5587.5J1273.811.419.833.951.275.6102.7136.2198.1229.3J1377.54.55.37.69.712.115.324.134.239.7J1479.83.84.14.45.77.89.411.613.815.81#桩身侧壁摩阻力数据表(kPa)截面序号深度范围加载等级123456789J1-J21.8-9.420.036 28.648 37.794 48.223 51.034 49.354 49.589 49.259 49.212 J2-J39.4-14.334.405 37.280 48.867 65.554 71.165 75.818 77.718 78.595 81.981 J3-J414.3-23.330.107 33.705 41.071 51.385 54.696 58.463 61.779 65.859 79.493 J4-J523.3-30.110.550 21.182 23.031 33.709 41.538 47.331 49.560 52.433 67.056 J5-J630.1-36.56.770 22.381 27.566 29.842 32.913 34.504 41.629 46.951 61.188 J6-J736.5-39.06.223 20.642 24.685 31.115 35.937 45.534 47.683 54.829 69.789 J7-J839.0-45.719.039 33.488 45.068 46.630 54.944 62.231 72.623 81.496 84.649 J8-J945.7-51.75.139 7.255 14.768 15.849 22.945 25.737 35.651 48.463 49.928 J9-J1051.7-57.57.718 12.636 19.277 23.167 29.608 43.672 50.758 60.143 62.612 J10-J1157.5-70.01.744 2.916 7.767 13.477 22.746 35.024 49.402 60.428 63.824 J11-J1270.0-73.60.829 1.183 1.625 2.343 16.965 30.460 32.439 36.407 39.590 J12-J1373.6-77.50.704 1.479 2.683 4.234 6.478 8.917 11.437 16.721 19.343 3#桩身轴力数据表(kN)截面序号深度加载等级123456789J11.8 24003600480060007200840096001080012000J29.4 2055.93078.24086.35101.26248.67475.28677.29882.311107J314.3 1622.62613.93469.54296.35362.76547.17711.58903.110073.3J423.3 962.91855.72553.73136.14132.95232.56307.47422.98280.5J530.1 760.51482.32150.225613425.34410.35466.16501.97157.8J636.5 645.31122.81733.52071.32890.83856.24795.35756.76108.3J739.0 598.51000.21567.81875.92662.83573.14490.75421.95683.6J845.7 282.1446.3816.51095.61743.72539.83278.54052.94269.9J951.7 193.4330.2595.3862.91390.62133.727483322.93520.5J1057.2 88.5146.1302.9511.2965.81496.91996.32449.32611.4J117026.742.980.3120.3242.7396.8445.2541.6594.1J1273.815.223.438.155.680.3118.3150.8215.5231.7J1377.55.77.98.910.214.317.126.937.948.3J1479.84.14.55.27.1910.112.414.619.43#桩身侧壁摩阻力数据表(kPa)截面序号深度范围加载等级123456789J1-J21.8-9.418.015 27.318 37.365 47.055 49.809 48.417 48.312 48.045 46.752 J2-J39.4-14.335.185 37.702 50.085 65.359 71.936 75.363 78.416 79.513 83.938 J3-J414.3-23.329.165 33.520 40.487 51.292 54.369 58.118 62.075 65.439 79.259 J4-J523.3-30.111.843 21.849 23.610 33.651 41.404 48.109 49.227 53.890 65.692 J5-J630.1-36.57.162 22.350 25.906 30.445 33.230 34.448 41.704 46.329 65.247 J6-J736.5-39.07.448 19.512 26.372 31.099 36.287 45.057 48.479 53.285 67.593 J7-J839.0-45.718.790 32.894 44.617 46.339 54.582 61.364 71.988 81.300 83.954 J8-J945.7-51.75.882 7.699 14.669 15.431 23.416 26.930 35.180 48.410 49.696 J9-J1051.7-57.57.196 12.629 20.059 24.127 29.142 43.685 51.568 59.930 62.365 J10-J1157.5-70.01.967 3.285 7.086 12.443 23.017 35.017 49.373 60.724 64.213 J11-J1270.0-73.61.271 2.155 4.664 7.151 17.949 30.781 32.538 36.042 40.054 J12-J1373.6-77.50.969 1.581 2.979 4.632 6.733 10.325 12.641 18.119 18.711 J13-J1477.5-79.80.277 0.588 0.640 0.536 0.917 1.211 2.508 4.031 5.000 4#桩身轴力数据表(kN)截面序号深度加载等级123456789J11.8 24003600480060007200840096001080012000J29.4 2038.93097.34151.95143.26317.27518.38720.89923.211137.5J314.3 1571.42552.73445.24256.85419.76598.57763.48953.810100.2J423.3 895.61808.12521.43158.34162.75283.76378.97511.68378.7J530.1 702.71492.32108.62521.43453.14473.25513.86611.37201.7J636.5 595.11195.71741.52040.22920.53867.84828.35798.36239.8J739.0 517.21025.81531.21821.72685.33596.14519.15413.95793.8J845.7 233.2402.9819.51051.61776.32587.53297.44015.74327.6J951.7 157.5289.3620.7802.714282168.22801.93381.43617.8J1057.2 65.2135.8321.3467.3912.51515.72011.82498.22685.3J117020.232.745.275.5212.7402.3468.4567.8623.1J1273.810.917.531.542.770.9133.7186.1221.7253.8J1377.54.156.88.315.119.830.747.363.2J1479.82.83.545.29.510.613.517.822.84#桩身侧壁摩阻力数据表(kPa)截面序号深度范围加载等级123456789J1-J21.8-9.418.905 26.318 33.930 44.857 46.218 46.160 46.029 45.904 45.155 J2-J39.4-14.337.962 44.222 57.385 71.977 72.878 74.689 77.742 78.717 84.230 J3-J414.3-23.329.877 32.919 40.841 48.564 55.572 58.127 61.208 63.759 76.107 J4-J523.3-30.111.287 18.478 24.154 37.267 41.521 47.425 50.619 52.679 68.870 J5-J630.1-36.56.689 18.440 22.823 29.916 33.112 37.638 42.617 50.544 59.801 J6-J736.5-39.012.398 27.040 33.470 34.775 37.433 43.242 49.211 61.179 70.983 J7-J839.0-45.716.866 36.992 42.265 45.733 53.982 59.897 72.552 83.034 87.072 J8-J945.7-51.75.020 7.533 13.183 16.506 23.097 27.806 32.859 42.063 47.070 J9-J1051.7-57.56.332 10.530 20.539 23.009 35.364 44.762 54.202 60.589 63.971 J10-J1157.5-70.01.432 3.282 8.789 12.471 22.275 35.441 49.128 61.447 65.642 J11-J1270.0-73.61.028 1.680 1.514 3.625 15.672 29.687 31.201 38.252 40.817 J12-J1373.6-77.50.694 1.275 2.520 3.510 5.693 11.620 15.854 17.793 19.445 J13-J1477.5-79.80.225 0.259 0.484 0.536 0.969 1.592 2.976 5.103 6.989 6#桩身轴力数据表(kN)截面序号深度加载等级123456789J11.8 24003600480060007200840096001080012000J29.4 1993.73027.93968.15083.66225.27483.18687.39902.111103J314.3 1576.42509.43196.34271.65348.86590.47755.78971.410200.4J423.3 986.21811.32183.23079.34109.45251.26353.27501.78652.3J530.1 762.51359.71683.72473.23492.34422.35451.36586.17856.3J636.5 643.41059.31350.32053.23066.23980.34951.76050.37222.1J739.0 584.3939.81205.21857.62853.13753.24682.15755.86883.6J845.7 433.7695.7896.31392.22321.33113.33859.24733.25758.2J951.7 296.2486.6623.91063.31935.32635.23371.64202.35125.3J1057.2 213.7352.1462.5852.81453.52118.62831.73575.54338.6J1163.5101.9180.5248.7452.9859.11428.32079.72727.73387.5J126759.793.1133.8286.6595.31036.71596.52198.22789.36#桩身侧壁摩阻力数据表(kPa)截面序号深度范围加载等级123456789J1-J21.8-9.421.271 29.951 43.553 47.977 51.034 48.003 47.783 47.008 46.961 J2-J39.4-14.333.885 42.103 62.671 65.936 71.165 72.489 75.647 75.574 73.292 J3-J414.3-23.326.093 30.863 44.789 52.711 54.794 59.206 62.004 64.975 68.441 J4-J523.3-30.113.089 26.424 29.227 35.465 36.108 48.501 52.773 53.574 46.576 J5-J630.1-36.57.404 18.676 20.727 26.111 26.491 27.479 31.060 33.311 39.428 J6-J736.5-39.09.406 19.019 23.093 31.131 33.916 36.144 42.908 46.871 53.874 J7-J839.0-45.78.944 14.496 18.344 27.638 31.582 38.001 48.869 60.728 66.833 J8-J945.7-51.79.118 13.866 18.064 21.811 25.597 31.705 32.335 35.206 41.970 J9-J1051.7-57.55.660 9.227 11.072 14.441 33.052 35.439 37.038 42.999 53.969 J10-J1157.5-63.57.414 11.380 14.178 26.519 39.417 45.777 49.869 56.221 63.072 J11-J1263.5-67.04.797 9.936 13.062 18.905 29.989 44.518 54.931 60.195 68.005 7#桩身轴力数据表(kN)截面序号深度加载等级123456789J11.8 24003600480060007200840096001080012000J29.4 2021.33095.34020.35110.56285.77508.68757.69987.511201.5J314.3 1598.72482.33214.84242.85401.86611.57830.49051.410284.9J423.3 956.91790.22160.23101.34232.75283.76437.27548.58789.6J530.1 718.71381.21668.22496.83538.74401.85485.16611.37899.4J636.5 603.81077.51321.52085.33097.33952.74952.96023.57300.6J739.0 555.8991.31198.51895.32891.23725.94695.35711.86943.8J845.7 411.9718.9913.81432.82368.53094.53915.84912.85861.5J951.7 305.7483.8669.31125.91958.22650.33425.84315.95159.4J1057.2 197.2332.8500.2888.11502.92085.92831.73618.64285.3J1163.598.7171.2263.7478.9897.51403.72051.82700.83205.8J126750.999.2155.3301.2620.71015.81622.82205.72638.77#桩身侧壁摩阻力数据表(kPa)截面序号深度范围加载等级123456789J1-J21.8-9.419.826 26.423 40.820 46.569 47.867 46.668 44.103 42.537 41.804 J2-J39.4-14.334.316 49.777 65.408 70.459 71.774 72.846 75.290 76.013 74.429 J3-J414.3-23.328.374 30.598 46.624 50.465 51.686 58.702 61.593 66.443 66.107 J4-J523.3-30.113.938 23.932 28.788 35.371 40.608 51.602 55.710 54.838 52.088 J5-J630.1-36.57.143 18.881 21.554 25.583 27.442 27.920 33.087 36.543 37.227 J6-J736.5-39.07.639 13.719 19.576 30.239 32.802 36.096 40.998 49.609 56.786 J7-J839.0-45.78.546 16.177 16.907 27.466 31.041 37.496 46.292 47.450 64.274 J8-J945.7-51.77.043 15.591 16.214 20.352 27.209 29.457 32.494 39.583 46.559 J9-J1051.7-57.57.443 10.359 11.600 16.313 31.234 38.719 40.756 47.836 59.964 J10-J1157.5-63.56.532 10.716 15.683 27.136 40.147 45.240 51.719 60.863 71.587 J11-J1263.5-67.05.434 8.185 12.323 20.201 31.467 44.097 48.770 56.284 64.469 8#桩身轴力数据表(kN)截面序号深度加载等级123456789J11.8 24003600480060007200840096001080012000J29.4 2007.93052.84011.55173.56305.27538.68772.99995.711215.6J314.3 1558.32453.73195.64305.85406.56602.47852.29078.510314.3J423.3 945.81737.52178.23191.34256.35305.16456.87572.88862.8J530.1 692.71346.31635.92511.33502.64424.55511.66638.27934.6J636.5 553.81115.61352.42098.63076.53931.54978.66048.37322.5J739.0 511.81021.81223.71938.72900.63714.34729.35768.77031.3J845.7 394.6795.3924.81454.22345.33065.73940.24900.35934.9J951.7 305.3593.8685.31148.51972.82623.73405.44294.95224.7J1057.2 207.2388.3455.6805.11522.42112.32814.23602.74381.2J1163.5105.7201.3255.9476.3914.51442.72032.82743.73395.5J126763.2108.2147.3325.6634.91067.61611.32238.42827.38#桩身侧壁摩阻力数据表(kPa)截面序号深度范围加载等级123456789J1-J21.8-9.420.528 28.648 41.281 43.270 46.846 45.097 43.302 42.108 41.066 J2-J39.4-14.336.508 48.648 66.252 70.459 72.976 76.021 74.762 74.478 73.187 J3-J414.3-23.327.078 31.663 44.979 49.272 50.850 57.353 61.690 66.567 64.170 J4-J523.3-30.114.810 22.890 31.732 39.789 44.101 51.526 55.306 54.686 54.312 J5-J630.1-36.58.635 14.343 17.625 25.658 26.491 30.650 33.137 36.674 38.054 J6-J736.5-39.06.685 14.929 20.483 25.449 27.995 34.568 39.677 44.500 46.346 J7-J839.0-45.76.960 13.451 17.751 28.773 32.977 38.518 46.862 51.571 65.111 J8-J945.7-51.75.922 13.362 15.882 20.272 24.702 29.311 35.465 40.147 47.097 J9-J1051.7-57.56.730 14.098 15.758 23.558 30.898 35.083 40.557 47.486 57.865 J10-J1157.5-63.56.731 12.401 13.243 21.804 40.313 44.404 51.818 56.964 65.366 J11-J1263.5-67.04.831 10.584 12.346 17.132 31.786 42.642 47.917 57.444 64.594 9#桩身轴力数据表(kN)截面序号深度加载等级123456789J11.824003600480060007200840096001080012000J29.41988.53111.74120.15092.96217.27436.48640.89855.911058J314.31485.62485.93449.34295.65332.86488.67661.78890.210089.4J423.3912.31682.32597.33130.34111.65201.26298.37511.58652.3J530.1702.51285.32152.32563.23456.74482.35481.36699.47846.3J636.5503.4889.31610.31997.32852.33828.34781.76000.27152.1J739.0424.3729.61405.21690.72536.53501.24422.15635.76733.6J845.7263.7415.7786.31002.51721.32583.33309.24453.45358.2J951.7146.2226.3403.6563.51105.31927.22531.63652.64425.7J1057.272.1112.5192.6319.8776.71498.61956.72995.63488.69#桩身侧壁摩阻力数据表(kPa)截面序号深度范围加载等级123456789J1-J21.8-9.421.544 25.564 35.595 47.490 51.453 50.448 50.218 49.427 49.317 J2-J39.4-14.340.836 50.816 54.470 64.742 71.815 76.963 79.504 78.416 78.652 J3-J414.3-23.325.345 35.527 37.667 51.518 53.989 56.916 60.276 60.952 63.534 J4-J523.3-30.112.276 23.230 26.038 33.183 38.320 42.065 47.805 47.518 47.161 J5-J630.1-36.512.378 24.619 33.696 35.182 37.575 40.659 43.494 43.469 43.158 J6-J736.5-39.012.589 25.417 32.643 48.797 50.261 52.060 57.232 58.012 66.606 J7-J839.0-45.79.537 18.641 36.754 40.870 48.412 54.511 66.091 70.212 81.680 J8-J945.7-51.77.792 12.560 25.379 29.112 40.850 43.509 51.566 53.105 61.838 J9-J1051.7-57.0.6.857 10.530 19.524 22.550 30.406 39.659 53.197 60.793 86.712 10#桩身轴力数据表(kN)截面序号深度加载等级123456789J11.824003600480060007200840096001080012000J29.42006.93145.24219.75121.86232.87452.88665.99867.511071.5J314.31511.32500.23485.34277.65318.46463.47665.58895.910100.2J423.3891.81697.92618.73167.64126.75232.56325.27492.98678.6J530.1681.71261.72105.92581.73437.94461.85523.86685.87869.1J636.5491.4868.71643.82000.42840.23802.54781.35940.77126.1J739.0397.8700.91391.21728.12563.43501.24466.85617.26701.5J845.7288.9399.7741.8983.71748.12611.83305.54428.95325.9J951.7167.3201.6381.3541.91137.51951.82522.33621.84400.8J1057.265.9101.3177.8285.7733.51508.91931.92948.33462.610#桩身侧壁摩阻力数据表(kPa)截面序号深度范围加载等级123456789J1-J21.8-9.420.580 23.810 30.381 45.977 50.636 49.589 48.903 48.820 48.610 J2-J39.4-14.340.243 52.375 59.634 68.550 74.251 80.341 81.234 78.895 78.871 J3-J414.3-23.327.388 35.469 38.312 49.073 52.685 54.418 59.254 62.026 62.849 J4-J523.3-30.112.294 25.523 30.005 34.283 40.304 45.096 46.89