China Scan Tour on Ground Improvement Technologies Prepared by the - - PowerPoint PPT Presentation
China Scan Tour on Ground Improvement Technologies Prepared by the ASCE G-I China Scan Tour Team Presented by Jie Han, Ph.D., PE, F.ASCE Glenn L. Parker Professor The University of Kansas China Scan Tour on Ground Improvement Technologies
Suzhou River Deep Drainage and Storage Facility
Suzhou river Huangpu river
60 to 70 m (195 to 230 ft) deep
(9.5 mi) of deep tunnels
diameters ranging from 8 to 10 m (26 to 33 ft)
195 ft) along the Suzhou River
Credit: Shanghai Foundation Engineering Group CP., LTD., The Third Engineering Company
(110 ft) (195 ft) (112 ft) (345 ft) (345 ft) (162 ft)
Wall thickness = 3.3 to 4.9 ft
Credit: Shanghai Foundation Engineering Group CP., LTD., The Third Engineering Company
= 150m (492ft)
Credit: Shanghai Foundation Engineering Group CP., LTD., The Third Engineering Company
Credit: Shanghai Foundation Engineering Group CP., LTD., The Third Engineering Company
Bauer BC40 hydromill mounted on a Bauer MC128 crane Bauer BC40 on a Bauer MC96 & Jintai SG60A hydromills Support cranes and hydromills
= 80 m (262 ft)
= 150m (492 ft)
Milling a 300 mm (12 in)
panel using the hydromill. Pre-installed steel pipes for a post-construction freezing system at the panel ends. Option for exterior grouting patterns at the panel joints.
Panel No. Start Date Installation Time (hours) Measured Verticality Over- break ZQ2 30 Dec 2017 120 1/3750 114% ZQ3 06 Jan 2018 76 1/1600 106% ZQ2-3 12 Jan 2018 297 1/1000 109% Credit: Shanghai Foundation Engineering Group CP., LTD., The Third Engineering Company
Hydration and settling tanks Desanding and desilting units Quality assurance / quality control performed on the bentonite slurry
DDC typical suitable for partially saturated, non-plastic
8) where the groundwater table is sufficiently deep. DDC also effective for low permeability silt and clay, provided a proper drainage and/or dewatering system is installed Quick process, No fill or temporary matting (i.e., no preload or surcharge fill), Cost effectiveness for massive treatment, Straightforward, relatively simple installation, & construction equipment.
(0.6 mi) long municipal road. The total treatment area is 28,000 m2 (6.9 acre).
bearing capacity of 120 kPa (2,500 psf), and a subgrade modulus no less than 25 MPa (3,625 psi)
Credit: Shanghai GeoHabour Co.
Credit: Shanghai GeoHabour Co.
Process 1st pass tamping 2nd pass tamping 3rd pass tamping Ironing Settlement (cm) 23.4 31.3 7.1 10.8 Total settlement (cm) 72.6 Credit: Shanghai GeoHabour Co.
Excavation & Ground Water Cut-off by:
anchor bonding zone
with recoverable W-beams
12 m depth in very difficult soils
Credit: Zhejiang Zhongqiao Prestress Equipment Co., Ltd. & The Architectural Design and Research Inst. of Zhejiang Univ. Co., Ltd.
Detachable Anchor
release strand
Credit: Zhejiang Zhongqiao Prestress Equipment Co., Ltd. & The Architectural Design and Research Inst. of Zhejiang Univ. Co., Ltd.
Reusable W-beams in the soil mixed columns Beams coated with a tar & grease mix Beams vertically inserted into fresh mixed column Above soil mixing, beams wrapped with styrofoam sheets & cast into concrete grade beam After excavation finished, W-beams pulled out
Credit: Huadong Engineering Corporation Ltd.
Credit: Dr. Huayang Lei Menard (2001)
Vacuum tubes & PVDs used to inject high pressure air to prevent clogging & facilitate water movements to speed up consolidation
Credit: Dr. Huayang Lei Credit: Dr. Huayang Lei
Multiple small water-jet vacuum pumps used on another project site (not on the tour)
Credit: Dr. Jie Han
Jones et al. 2011
Credit: Hangzhou Shenyuan Environmental Sci-Tech Co. Ltd
Beltline, 32.5-km long section to be constructed over soft soil
heights 2 ~ 6 m, & 5 to 6 m near bridge-approach embankment
network area
No. Soil layer w (%) Es (MPa) c (kPa) φ(°) ② Soft soil 1 43.5 3.07 9.8 4.6 ③ Soft soil 2 40.9 3.23 10.3 5.3
Counter rotation deep mixing: 0.5m column
inner casing
gear box to counter rotate inner and outer casing
casings
In-situ soil
Soft soil
Moving direction Soft Clay W≤60% Mixing Ratio 1m3 Cement （%） Fly Ash （%） Admix （%） Cement （Kg） Fly Ash （Kg） Admix （Kg） 3.0 3.0 \ 47.4 47.4 \
Full system DAQ
Credit: China Railway Construction Co.
The bamboo-shaped or nodular pipe piling system (static drill rooted nodular [SDRN] pile system) Composite system combines pile foundations with soil mixing and grouting Start with a partially grouted and partially soil mixed hole. Insert hollow precast pipe sections Typically used for structural support of structures and in conjunction with column- supported embankments.
Credit: Dr. Gang Zheng
Credit: Dr. Hanlong Liu
Credit: Dr. Songyu Liu