Impact rolling method of liquefiable soil foundation with high water content
A technology of impact rolling and high moisture content, applied in infrastructure engineering, soil protection, construction, etc., can solve the problem of treatment principles and treatment efforts without clear guidance, no evidence to rely on, and liquefiable foundation treatment design Lack of clear guidance and other issues to achieve an effect that is conducive to drainage consolidation
Active Publication Date: 2015-05-20
JSTI GRP CO LTD
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Problems solved by technology
After the Wenchuan Earthquake on May 12, 2008, the Ministry of Transport promulgated the "Seismic Rules for Highway Bridges" JTG / TB02-01-2008. However, there is still a lack of clear guidance on the design of highway liquefiable foundation treatment. Design units often feel that there is no evidence to rely on when dealing with liquefiable soil foundations, and no clear guidance can be found on the principles and strength of treatment.
As a new method of subgrade treatment, impact rolling has the advantages of being simple and fast, saving labor and time, improving the quality of the subgrade, prolonging the service life of the road surface, and greatly reducing the engineering cost, but it is not directly applicable to high Moisture content liquefiable soil foundation
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[0031] A construction method of impact rolling of high water content liquefiable soil foundation of the present invention comprises the following steps:
[0032] S1. Clean and level the impact rolling road section, and measure the ground elevation at the same time;
[0033] S2, measuring and setting out the construction area;
[0034] S3, pave the gravel soil cushion and measure the gravel soil elevation;
[0035] S4. Excavate gravel blind ditches and drainage ditches on both sides respectively along the longitudinal and transverse directions of the road centerline;
[0036] S5, leveling the gravel soil cushion and measuring the gravel soil elevation;
[0037] S6. The impact roller adopts the back and forth staggered wheel method to roll the impact rolling section multiple times, and the wheel tracks do not overlap and cover the entire impact rolling section surface;
[0038] S7. Calculate the accumulative settlement amount and detect the number of standard penetration hits...
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The invention provides an impact rolling method of a liquefiable soil foundation with high water content. The impact rolling method includes the steps of firstly, leveling a road section to be impact-rolled, and measuring ground elevation; secondly, surveying a construction area; thirdly, paving a gravelly soil cushion and measuring gravelly soil elevation; fourthly, digging gravel blind ditches and side drain ditches longitudinally and transversely along a center line of a road; fifthly, leveling the gravelly soil cushion and measuring the gravelly soil elevation; sixthly, using an impact roller to multiply roll the road section to be impact-rolled by back-and-forth wheel staggering, and guaranteeing no overlapping of wheel marks and coverage of the whole surface of the road section to be impact-rolled; and seventhly, calculating cumulative subsidence and detecting blow counts of standard penetration test. The construction method is convenient and fast, foundation quality is improved, the service life of pavement is prolonged, projection cost is lowered, and environmental influence is low.
Description
technical field [0001] The invention relates to the technical field of expressway foundation treatment, in particular to an impact rolling construction method for liquefiable soil foundation with high water content. Background technique [0002] my country is an earthquake-prone country, and earthquakes often threaten engineering safety. At present, our country is in a new period of seismic activity, and the frequency of earthquakes is increasing, which poses a serious threat to our country's booming infrastructure construction. The experience of earthquake damage at home and abroad shows that road bridges will be severely damaged during earthquakes, resulting in road cracks, landslides, uplifts, uneven subsidence, bridge pier abutment slippage or damage to piers, columns, and supports. In plain and valley areas, these earthquake damages are mainly caused by foundation failures such as subsidence and liquefaction. After the Wenchuan Earthquake on May 12, 2008, the Ministry...
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IPC IPC(8): E02D3/054E02D3/10
Inventor 涂圣武杨扬沈晓平崔大伟何巍卢小超赵俊明曹文涛陈红斌
Owner JSTI GRP CO LTD