|
|
|
| A STUDY ON THE WATER PREVENTION FOR WEATHERED CRUST-SUBGRADE SLOPES |
| XU Zemin |
| ( Cheng du Institute o f Technolog y, Chengdu 610059) |
|
|
|
|
Abstract The paper pro poses tha t the sand clay layer cov ering on w ea thered crust-subg rade slopes may be t ransfo rmed to a wa terproof barrier by way o f chemical manipulation to prevent w ater permeating into slope bodies, and studies the problem taking some slope on Cheng yu railw ay. The result s indicates that it may reduce effectiv ely the permeability of the sand clay to g ro ut it wi th Na2 CO3 so lution o r mix i t w ith Na2CO3 pow der and the disposa l w ay i s simple and inex pensiv e. The w ater preventio n mechanism is fo r Na2 CO3 solutio n to t ransform Ca-mo ntmo rlloni tes into Na-mo ntmo rllo ni tes. Mixing the sand clay w ith lime and Na2 CO3 powder may not only reduce it s permeabi li ty but also increase it s st reng th remarkably and in v iew o f the complex ity of the disposal process, the scheme is fi t fo r the t reatments o f rosdbed sof t soils.
|
|
Received: 10 October 1998
|
|
|
|
1 Xu Zemin, Yang Lizho ng. Study on the mecha nism of Na2 CO3 so lutio n r educing permeability of clay [ J]. Pro ceeding s of the inter na tio nal sympo sium o n engineering a nd env iro nm enta l g eophysics. Ch eng du, China, 1997
2 S. D. Vo ro nkevich. Engineering g eo chemistr y: pr oblem and applica tio ns [ J]. Applied Geochemistr y , Vol. 9, 1994
3 C. S. Doo ro thea, et al. Chemica l ma nipulatio n of soil fo r sea ling landfills [ J]. Applied Geo ch emistr y, Vol. 11, 1996
4 R. D. Schuiling. Geo chemica l eng ineering: some tho ug hts on a new r esea rch field [ J ], Applied Geochemist ry , Vol. 5, 1990
5 R. D. Sch uuiling. Geochemical engineering [ J]. 6th Inter na tional IAEG Co ng ress, 1990
6 C. D. F. Rog er , et al. The r ole of lime mig ra tion in lime pile stabilizatio n o f slo pes [ J]. Qua r terly Jour nal of Engineering Geolog y, 1996, 29: 273～ 284 |
|
|
|
1998, Vol. 15 
