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1施工组织设计一、工程概况拟建工程为光信·学府嘉园项目,位于太原市学府街以南,坞城中路以东,师范街以北,绿军苑以西。基坑开挖深度约9.5-13.5m,本工程桩基础采用后压浆钢筋混凝土灌注桩,支护拟采用钢筋砼灌注桩+土钉,止水帷幕桩采用深层搅拌桩,钢筋砼灌注桩成孔工艺采用旋挖钻机钻进,工程桩(GCZ)桩端持力层为第10层粉质黏土。二、场地工程地质及水文地质条件2.1地形、地貌拟建场地西南部较平坦,勘探点孔口标高介于781.41m~782.04m之间;场地内北部、东部因挖除原有建筑旧基础,形成基坑,勘探点孔口标高介于778.38m~779.46m之间。场地所处地貌单元为汾河东岸Ⅱ级阶地。2.2地层时代及成因类型根据本次勘察揭露地层,结合区域地质资料综合分析,本次勘察深度范围内,场地地基土主要由第四系全新统人工堆积层(Q42ml)、冲洪积层(Q41al+pl)上更新统冲洪积层(Q3al+pl)及中更新统冲洪积层(Q2al+pl)组成。岩性以人工填土、湿陷性粉土、粉土、粉质黏土、粉细砂、细中砂为主。2.3地基土构成及岩性特征根据野外勘探、原位测试及室内土工试验资料综合分析,在本次勘察深度范围内,场地地基土从上至下共分为14层,现依层序分述如下:第①层杂填土(Q42ml)杂色,主要由粉土、砖块、石块等建筑垃圾组成。其堆积年限大于10年。该层物质成分杂乱,结构松散,均匀性差。第②层湿陷性粉土(Q41al+pl)褐黄色,含云母、煤屑、氧化物等。湿陷性程度轻微~中等。该层夹薄层细中砂。稍湿、稍密,具中压缩性,压缩系数a1-2介于0.194~0.388MPa-1之间,平均0.323MPa-1。该层静力触探锥尖阻力qc平均为2.65MPa,侧壁摩阻力fs平均为47.1kPa;标贯试验实测击数N值4.0~9.0击,平均6.3击。第③层粉土该层根据力学性质差异,分为2个亚层:2第③1层粉土(Q41al+pl)褐黄色,含云母、氧化物等。该层夹薄层细中砂。稍湿、中密,具中压缩性,压缩系数a1-2介于0.148~0.351MPa-1之间,平均0.255MPa-1。该层静力触探锥尖阻力qc平均为2.84MPa,侧壁摩阻力fs平均为50.4kPa;标贯试验实测击数N值4.0~7.0击,平均5.4击。第③2层粉土(Q41al+pl)褐黄色,含云母、氧化物等。该层夹薄层细中砂。稍湿~湿、中密,为中灵敏性土,具中压缩性,压缩系数a1-2介于0.320~0.471MPa-1之间,平均0.384MPa-1。该层静力触探锥尖阻力qc平均为0.62MPa,侧壁摩阻力fs平均为14.8kPa;标贯试验实测击数N值3.0~7.0击,平均4.6击。第④层粉细砂(Q41al+pl)褐黄色,矿物成分主要为石英、长石、云母等,混夹大量粉土,局部混粗砾砂。饱和,松散~稍密,颗粒级配不良。该层静力触探锥尖阻力qc平均为7.30MPa,侧壁摩阻力fs平均为83.2kPa;标贯试验实测击数N值8.0~15.0击,平均11.5击。第⑤层粉土该层根据力学性质差异,分为2个亚层:第⑤1层粉土(Q41al+pl)褐黄色,含云母、氧化物等,混有粉细砂、粗砂。湿、密实,具中压缩性,压缩系数a1-2介于0.163~0.281MPa-1之间,平均0.232MPa-1。该层静力触探锥尖阻力qc平均为0.87MPa,侧壁摩阻力fs平均为16.2kPa;标贯试验实测击数N值7.0~14.0击,平均10.1击。该层主要分布在场地东北侧。第⑤2层粉土(Q41al+pl)褐黄色,含云母、氧化物等,混有粉细砂、粗砂。湿、密实,具中压缩性,压缩系数a1-2介于0.126~0.298MPa-1之间,平均0.202MPa-1。该层静力触探锥尖阻力qc平均为2.66MPa,侧壁摩阻力fs平均为77.5kPa;标贯试验实测击数N值9.0~15.0击,平均12.3击。第⑥层粉细砂(Q41al+pl)褐黄色,矿物成分主要为石英、长石、云母等,混夹大量粉土,局部混粗砾砂。饱和,中密,颗粒级配不良。该层静力触探锥尖阻力qc平均为9.57MPa,侧壁摩阻力fs平均为129.5kPa;标贯试验实测击数N值18.0~23.0击,平均20.4击。3第⑦层粉土(Q3al+pl)褐黄色,含云母、氧化物等。湿、密实,具中压缩性,压缩系数a1-2介于0.117~0.385MPa-1之间,平均0.208MPa-1。该层静力触探锥尖阻力qc平均为2.66MPa,侧壁摩阻力fs平均为88.3kPa;标贯试验实测击数N值16.0~20.0击,平均18.0击。第⑧层细中砂(Q3al+pl)褐黄色,矿物成分主要为石英、长石、云母等。饱和,中密~密实,颗粒级配不良。标贯试验实测击数N值24.0~35.0击,平均29.0击。第⑨层粉土(Q3al+pl)褐黄色,含云母、氧化物、钙质菌丝等。混有大量粉质黏土。湿、密实,具中压缩性,压缩系数a1-2介于0.162~0.351MPa-1之间,平均0.238MPa-1。标贯试验实测击数N值23.0~30.0击,平均26.5击。第⑩层粉质黏土(Q3al+pl)褐黄色,含云母、氧化物、钙质菌丝等。可塑状态,具中压缩性,压缩系数a1-2介于0.186~0.372MPa-1之间,平均0.274MPa-1。标贯试验实测击数N值25.0~35.0击,平均29.8击。第⑪层中砂(Q3al+pl)褐黄色,矿物成分主要为石英、长石、云母等。饱和,密实,颗粒级配不良。标贯试验实测击数N值37.0~48.0击,平均40.5击。第⑫层粉质黏土(Q2al+pl)褐黄色~褐红色,含云母、氧化物、钙质菌丝等。可塑~硬塑状态,具中压缩性,压缩系数a1-2介于0.149~0.394MPa-1之间,平均0.250MPa-1。标贯试验实测击数N值31.0~49.0击,平均40.1击。第⑬层中粗砂(Q2al+pl)褐黄色,矿物成分主要为石英、长石、云母等。饱和,密实,颗粒级配不良。标贯试验实测击数N值49.0~55.0击,平均53.0击。第⑭层粉土(Q2al+pl)褐黄色,含云母、氧化物等。稍湿、密实,具中压缩性,压缩系数a1-2介于0.174~0.281MPa-1之间,平均0.233MPa-1。标贯试验实测击数N值44.0~52.0击,平均47.2击。4上述各土层的接触组合关系、分布特征及标贯试验指标详见《工程地质剖面图》(No.03~No.23)。主要建筑物地层统计结果见表2.3-1~表2.3-6。表2.3-11#住宅楼地层统计表层号岩土名称厚度(m)底板埋深(m)底板标高(m)钻孔个数最小值最大值平均值最小值最大值平均值最小值最大值平均值①杂填土1.101.901.351.101.901.35779.54780.38780.114②湿陷性粉土0.601.401.152.502.502.50778.93779.00778.964③1粉土3.404.003.573.606.005.23774.63775.60775.326③2粉土2.805.103.736.809.808.97770.17772.00771.596④粉细砂1.302.802.108.9012.3011.07768.87770.03769.496⑤1粉土3.63.93.7512.813.613.2765.27765.83765.552⑤2粉土0.94.83.0513.716.815.37764.17765.9765.196⑥粉细砂1.103.001.6515.4018.6017.02762.90764.54763.546⑦粉土7.109.508.3323.4026.7025.35754.13756.07755.216⑧细中砂2.004.803.7526.5030.4029.10750.67752.14751.466⑨粉土6.209.207.2034.4037.4036.30742.93744.90744.266⑩粉质黏土8.5010.508.9744.3045.9045.27733.97736.40735.296⑪中砂2.303.402.7246.6048.8047.98731.07733.43732.576⑫粉质黏土12.6013.4013.0060.6061.2060.90717.67720.83719.252⑬中粗砂2.602.902.7563.2064.1063.65714.77718.23716.502⑭粉土最大揭露厚度6.80m5表2.3-22#住宅楼地层统计表层号岩土名称厚度(m)底板埋深(m)底板标高(m)钻孔个数最小值最大值平均值最小值最大值平均值最小值最大值平均值①杂填土1.201.401.351.201.401.35780.28780.64780.456②湿陷性粉土2.103.302.773.504.504.12777.11778.54777.686③1粉土2.003.202.536.506.906.65775.01775.34775.156③2粉土3.105.604.089.7012.3010.73769.74771.91771.066④粉细砂0.802.401.4211.0013.1012.15768.94770.72769.656⑤2粉土1.404.902.8214.1015.9014.97765.71767.69766.836⑥粉细砂1.302.301.6215.4017.4016.58764.21766.39765.216⑦粉土8.3012.4010.4525.0028.1027.03753.58756.73754.766⑧细中砂2.105.503.2730.0030.5030.30751.23751.92751.496⑨粉土6.107.206.6236.3037.6036.92744.11745.74744.886⑩粉质黏土10.7012.1011.3847.8048.7048.30732.91733.88733.496⑫粉质黏土13.4014.2013.8061.8062.0061.90719.68720.12719.902⑬中粗砂2.102.602.3563.9064.6064.25717.08718.02717.552⑭粉土最大揭露厚度6.10m表2.3-33#住宅楼地层统计表层号岩土名称厚度(m)底板埋深(m)底板标高(m)钻孔个数最小值最大值平均值最小值最大值平均值最小值最大值平均值②湿陷性粉土1.001.001.001.001.001.00778.09778.09778.091③1粉土2.903.603.303.303.903.55775.05775.68775.384③2粉土3.105.103.726.708.507.27770.58772.08771.654④粉细砂1.105.902.808.2012.7010.07766.18770.89768.854⑤1粉土2.564.2213.515.214.3763.68765.58764.634⑤2粉土0.81.51.114.516.715.4762.18764.58763.534⑥粉细砂0.301.300.8515.6017.0016.25761.88763.48762.684⑦粉土3.706.505.5019.8022.7021.75755.95759.29757.174⑧细中砂4.507.505.3826.9027.3027.13751.35752.08751.804⑨粉土8.909.609.3036.2036.9036.43741.75742.89742.504⑩粉质黏土12.3013.6012.9549.2049.8049.38729.08729.89729.554⑪中砂0.500.900.6349.8050.3050.07728.55729.28728.803⑫粉质黏土9.9010.9010.4060.1060.2060.15718.68718.99718.832⑬中粗砂3.603.703.6563.7063.9063.80714.98715.39715.182⑭粉土最大揭露厚度6.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