挖方区土石方调查与统计

5、挖方区土石方调查与统计5.1土石方调查的目的与作用查明拟建场地挖方区的土石方分布情况为本次调查主要目的与任务，调查方法主要根据外业钻探成果结合工程地质调查展开，其主要目的是明确土石比例，为场平工程预算提供可靠的依据，准确的土石方工程量，对于拟定合理场平方案、正确选择工程施工机械、确切估算工程造价和工期、妥善安排工程施工进度等都具有决定性意义。5.2土、石工程分级土石工程分级根据《市政工程地质勘察规范》DBJ50-147-2014附录A土、石工程分级标准，本工程土石可挖性分级如下：1人工填土、粉质粘土类别为普通土，土石等级为Ⅱ级；2强风化基岩类别为硬土，土石等级为Ⅲ级；3中风化泥岩类别为软石，土石等级为Ⅳ级；4中风化砂岩类别为次坚石，土石等级为Ⅴ级。5.3土石方统计方法为了解本场地土石方工程量及分布情况，计算土石方量的方法不同，则计算的结果可能相差较大，因此针对实际情况选择一种好的计算方法是非常有必要的。根据现场钻探情况，采用平均断面法进行计算，此方法适用于线性工程中高程变化比较大、自然地面复杂及带状地形等特点。5.4土石方数量统计为明确土石比例，为本工程场平施工提供可靠的依据，根据本场地岩土可挖性等级分类，结合现状地貌及工程地质情况，对开挖形成的场平土石方量进行计算，具体详细见场平土石方数量统计表5.4-1~2。由表5.3可知：场地各地块挖方区域土石比为0.048:0.952~0.148:0.852；整个场地挖方区域土石比为0.076:0.924。表5.4-2挖方区土石方数量统计表取土场编号挖方总量挖方分类及数量(m3)土石素填土、粉质粘土强风化泥岩/砂岩中等风化泥岩中等风化砂岩土、石类别为Ⅱ类土、石类别为Ⅲ类土、石类别为IV类土、石类别为Ⅴ类(m3)比例(%)数量(m3)比例(%)数量(m3)比例(%)数量(m3)比例(%)数量(m3)345678910111号取土场230247.64.811046.116.1637197.379.05182004.200.02号取土场675679.46.5244085.615.67105905.477.8525688.400.03号取土场89214.414.8113211.329.7226515.755.4749487.500.04号取土场575041.68.8250715.916.192598.848.66279787.526.42151939.5合计1570183.07.58119058.916.7262217.166.041036967.59.68151939.5表5.4-2挖方区土石方数量统计表取土场编号控制剖面挖方总面积控制距离挖方总量挖方分类及数量(m3)土石比土石素填土、粉质粘土强风化泥岩、强风化砂岩中等风化泥岩中等风化砂岩/软岩较软岩土、石类别为Ⅱ类土、石类别为Ⅲ类土、石类别为IV类土、石类别为Ⅴ类(m2)(m)(m3)比例数量(m3)比例数量(m3)比例数量(m3)比例数量(m3)1234567891011121号取土场T1777.451.540037.6968.27637.431432.00.00.048:0.952T2773.484.265081.62933.411135.551012.70.0T31724.452.991135.55183.311922.774029.50.0T4735.846.233992.91961.26501.825529.90.0小计//230247.60.04811046.10.16237197.30.790182004.20.0000.02号取土场T52179.372.8158649.95364.723680.9129604.30.00.065:0.935T61685.675.6127434.64737.016039.3106658.30.0T71026.669.471245.210130.718132.242982.30.0T81156.342.048551.66737.711535.130278.80.0T92713.944.8121639.07034.614486.2100118.10.0T103086.648.0148159.110080.922031.6116046.50.0小计//675679.40.06544085.60.157105905.40.778525688.40.0000.03号取土场T11435.343.218805.22378.56128.310298.50.148:0.852T12635.040.825876.85131.27012.913732.7T13144.158.68436.7668.85240.92527.0T14534.067.636095.75032.88133.522929.3小计//89214.40.14813211.30.29726515.70.55549487.50.0000.04号取土场T151731.746.179890.41999.89639.168251.60.00.088:0.912T161489.942.563285.51269.512856.239242.19917.8T172028.952.7106962.62590.715731.435152.753487.8T18633.749.731517.36081.37914.71131.216390.1T19309.430.19297.95172.92569.21555.80.0T20114.943.95044.65044.60.00.00.0T2187.836.73223.2379.9765.72077.60.0T22204.252.210654.110654.10.00.00.0T23388.058.522681.01660.56795.914224.60.0T24796.367.954042.0777.710896.00.042368.3T251133.233.037434.9114.43873.63671.429775.4T26410.149.820423.014970.62475.32977.10.0T27951.570.667210.00.011236.555973.50.0T281157.954.763375.10.07845.355529.80.0