增压式真空预压技术

主讲人:金亚伟王军上海强劲地基股份有限公司江苏鑫泰岩土科技有限公司2014.5.22增压式真空预压技术Overvacnmpressuresystem一.增压式真空预压软基处理技术直通技术：通过手型接头把塑料排水板与真空管连接，缩短真空传递路径，使真空度能直达土体内部。防淤堵技术：减少井阻效应，达到最佳泥水分离的目标超压技术：在土体均匀设置增压管，使土体水分子在压力作用下定向流动，对软基进行快速固结，在有限工期内大幅度提高地基强度，减少工后沉降。不倒翁集水井技术：利用集水井气液分离,机械真空传至集水井,由集水井分布十个口,每一出口连接真空主管，主管再分布在支管上,达到真空压力均匀分布的目标.节电60%-90%123OVPS技术增压式真空预压软基处理OVPS技术Overvacnmpressuresystem•直通技术•超压固结技术•防淤堵技术•防淤堵技术二.常规真空预压原理水线1.5真空水位江苏鑫泰岩土科技有限公司增压式真空预压（超压真空密实法）原理三、技术特点•通过直连技术•采用增压技术•实施长短板联合抽真空技术•使用防淤堵技术1234采用增压技术通过直通技术使用防淤堵技术实施长短板联合抽真空技术对软基进行真空预压的同时，通过增压系统，对软土进行侧向增压，使土体中的水分子定向流动，加速土体固结。达到真空联合堆载80～120kPa的预压效果。控制滤膜孔径、达到最佳泥水分离效果。利用土性与滤膜孔径关系，研制特殊滤膜材料的高性能排水板，有效克服泥沙通过滤膜时造成的淤堵，达到最佳泥水分离目的。尤其是新近吹填的流塑状淤泥、渗透性非常差的土质加固效果更佳。采用手型接头，直接连接排水板与真空管，替除中粗砂粉砂垫层,实现低碳环保。缩短真空传递路径，减少了真空度的沿程损失，加快固结时间，提高加固效果。提高浅层固结强度,缩短施工时间。传统浅层真空系统和深层真空系统分开独立的,而我们利用浅层真空系统处理后在深层真空系统作用时,继续发挥浅层真空系统,使浅层土体固结强度大大提高。四、工程实例——1.天津吹填淤泥增压式真空预压（OVPS系统）软基处理法新技术应用工程工作原理图围海造地湖泊淤泥固结技术的应用土工布真空膜手型接头防於堵排水板增压管管网集水管真空膜3000500600017500天津增压真空预压实验应用工程无砂垫层浅层施工浅层处理后挖机开上去的情况浅层处理后插板情况深层联接真空管深层抽真空钻孔取样深层处理后沉降情况开挖情况工程名称：天津临港工业区真空预压软基加固增压法等新技术试验完善和应用工程钻孔编号：1区1#(加固前)孔口高程：5.28m钻孔日期：2011-7-11取土深度（m）含水率土粒比重湿密度干密度饱和度孔隙比液限塑限塑性指数液性指数压缩系数压缩模量试验方法凝聚力c摩擦角Φ土依规范土样编号ωGsρρdSre0ωLωPIpILav1-2Es1-2kPa度GB50021-2001%g/cm3g/cm3%%%MPa-1MPa分类1区1#-10.5-1.034.22.731.881.4098.40.94932.418.014.41.120.474.14粉质粘土1区1#-21.5-2.036.82.741.851.3598.31.02637.819.618.20.950.772.64粘土1区1#-32.5-3.044.92.761.781.2399.41.24745.321.723.60.980.842.68粘土1区1#-43.5-4.029.22.721.941.5097.90.81130.417.413.00.91粉质粘土1区1#-54.5-5.019.72.712.081.7495.40.56026.316.210.10.350.188.46粉质粘土1区1#-65.5-6.020.72.712.071.7196.70.58026.916.410.50.410.207.87Q13.125.0粉质粘土1区1#-76.5-7.021.32.712.051.6995.60.60427.616.611.00.430.236.86Q16.820.7粉质粘土1区1#-87.5-8.023.52.712.031.6498.20.64928.316.811.50.580.285.81粉质粘土1区1#-98.5-9.024.22.712.011.6297.20.67529.017.012.00.600.315.47粉质粘土1区1#-109.5-10.060.02.761.651.0398.81.67651.823.628.21.291.092.46淤泥1区1#-1110.5-11.048.52.761.741.1798.81.35647.822.525.31.030.972.43淤泥质粘土1区1#-1211.5-12.050.32.761.721.1498.31.41248.122.525.61.090.892.70淤泥质粘土1区1#-1312.5-13.058.12.761.671.0699.41.61351.323.527.81.241.411.85Q8.91淤泥1区1#-1413.5-14.065.42.761.610.9798.31.83554.324.330.01.371.332.13Q8.10.6淤泥1区1#-1514.5-15.057.92.761.671.0699.31.61050.423.227.21.281.292.02淤泥1区1#-1615.5-16.060.32.761.651.03991.68152.823.928.91.261.411.90q9.30.9淤泥1区1#-1716.5-17.041.32.761.821.2999.71.14342.821.021.80.930.832.57q11.21.5粘土1区1#-1817.5-18.049.42.761.731.1698.61.38346.222.024.21.131.072.22q10.90.7淤泥质粘土1区1#-1918.5-19.049.32.761.741.1799.41.36846.122.024.11.130.982.41q10.00.3淤泥质粘土1区1#-2019.5-20.050.72.761.731.1599.71.40447.322.325.01.141.092.21q10.32.4淤泥质粘土工程名称：天津临港工业区真空预压软基加固增压法等新技术试验完善和应用工程钻孔编号：1区1#(加固后)孔口高程：4.49m钻孔日期：取土深度（m）含水率土粒比重湿密度干密度饱和度孔隙比液限塑限塑性指数液性指数压缩系数压缩模量试验方法凝聚力c摩擦角Φ土样编号ωGsρρdSre0ωLωPIpILav1-2Es1-2kPa度%g/cm3g/cm3%%%MPa-1MPa1区1#-10.5-1.024.52.722.011.6197.30.68530.617.513.10.530.315.45q12.618.41区1#-21.5-2.034.02.741.851.38950.98536.419.117.30.860.623.211区1#-32.5-3.020.82.702.021.6791.40.61525.816.19.70.480.1610.25q7.428.91区1#-43.5-4.019.12.702.051.7290.70.56925.416.09.40.330.1510.541区1#-54.5-5.018.82.712.051.7389.30.57026.316.210.10.260.198.14q18.922.91区1#-65.5-6.019.82.702.051.7192.50.57825.215.99.30.420.1411.44q6.427.01区1#-76.5-7.019.62.702.051.71920.57525.315.99.40.390.227.081区1#-87.5-8.020.12.722.051.7192.10.59429.617.212.40.230.266.14q26.524.41区1#-98.5-9.020.52.702.041.69930.59525.215.99.30.49q6.725.21区1#-109.5-10.045.82.761.771.2199.31.27350.323.227.10.831区1#-1110.5-11.037.92.761.841.3397.91.06843.021.121.90.770.653.19q16.32.91区1#-1211.5-12.044.22.761.771.2397.71.24949.623.026.60.800.792.851区1#-1312.5-13.043.62.761.781.2498.11.22748.622.725.90.810.912.44q13.13.41区1#-1413.5-14.049.02.761.721.1597.21.39150.323.227.10.951.032.33q14.22.01区1#-1514.5-15.047.82.761.741.1898.11.34453.524.129.40.810.972.411区1#-1615.5-16.046.62.761.751.19981.31252.123.728.40.811.002.30q11.31.41区1#-1716.5-17.044.42.761.791.2499.91.22749.623.026.60.800.812.74q19.13.41区1#-1817.5-18.038.42.751.821.3296.81.09141.320.620.70.860.533.971区1#-1918.5-19.020.82.712.021.6790.80.62127.516.610.90.39浅层处理后的特色现象排水板周围形成固结柱浅层处理后施工机械安全进场！天津增压真空预压实验应用工程无砂垫层开挖情天津增压真空预压实验应用工程无砂垫层开挖情增压区防淤堵排水板开挖效果（含水量低41.6%）传统排水板开挖效果（含水量高56.9%）板外0.5—1.0cm的x10000电镜扫描图像防淤堵板外土体图像增压防淤堵板外土体图像普通板外土体图像项目评审会浅层十字板强度普通排水板区增压法区防淤堵排水板区1#2#3$4#5#6#1#2#3#4#5#6#1#2#3$4#5#6#1.01.61.92.81.62.11.622.98.411.76.310.12.117.611.010.18.010.84.21.53.51.62.62.33.32.122.510.115.715.013.88.915.913.18.412.917.37.52.08.22.83.53.56.31.421.512.414.517.314.312.615.78.013.613.315.79.12.511.91.24.04.95.62.316.817.616.417.311.010.820.812.413.313.114.317.13.09.61.97.33.55.13.719.418.014.319.216.115.2粉砂26.824.116.119.413.13.57.79.88.97.74.05.914.017.318.014.313.817.1粉砂粉砂15.912.617.64.07.314.37.510.54.98.417.318.517.614.76.819.910.16.87.114.795.234.864.473.6319.214.6115.4614.8712.2712.3618.114.2613.913.2214.3110.775.0114.7814.09深层十字板强度-16.0-14.0-12.0-10.0-8.0-6.0-4.0-2.00.02.04.06.00102030405060强度（kPa）标高（m）加固前加固后-16.0-14.0-12.0-10.0-8.0-6.0-4.0-2.00.02.04.06.0010203040506