CN102162237A - Vibration rolling and impact rolling combined construction method for compacting loess high filling body - Google Patents

Abstract

The invention discloses a vibration rolling and impact rolling combined construction method for compacting a loess high filling body, comprising the following concrete steps: in a construction area, evenly spreading incompact powdered loess until the height reaches 0.4m, and rolling for 10 times by a 50T vibratory roller at a running speed of 3km/h; when the filling height of the filling body reaches 1.5m, performing impact rolling for 20 times by a 25T3-25kJ roller; and continuously repeating the above steps until the filling height reaches the designed elevation of a loess high filling body. In the method provided by the invention, the vibration rolling and the impact rolling are combined for construction, thus solving the problem that the design standard can not be reached only by adopting a single process to compact loess; the process has the advantages of improving the compactedness of the powdered loess to 0.995, increasing the dry density of the powdered loess to 1.88g/cm<3>, eliminating the collapsibility of loess, saving cost, shortening construction period and preferably controlling the relative settlement of the high filling body after construction.

Description

The job practices of vibroroller cmpacting and the high filling body of impact-rolling associating compacting loess

Technical field

The present invention relates to the job practices in construction technology in geotechnical engineering field, be specially the job practices of a kind of vibroroller cmpacting and the high filling body of impact-rolling associating compacting loess.

Background technology

The processing method of existing filling body generally comprises: compacting (tamping, cal rolling method, vibration compaction method, shock compaction method, strong compaction method), consolidation (loading preloading, surcharge preloading method, sand drain method, vacuum method, the dewatering method of sinking).Yet, the method of this type of ground comes from the high fill foundation treatment technology of other soil property more, and adopts the effect of independent PROCESS FOR TREATMENT superelevation loess filling body unsatisfactory, promptly allows to reach design standard, also can roll up construction costs, the duration of a project is longer.

Summary of the invention

Defective or deficiency at the prior art existence, the objective of the invention is to, the job practices of a kind of vibroroller cmpacting and the high filling body of impact-rolling associating compacting loess is provided, method of the present invention has adopted vibroroller cmpacting and impact-rolling to unite construction, solved and considered under the prerequisite of cost, adopt single key issue that technology compacting loess can not reach design standard of planting, this kind technology can be increased to 0.995 with the degree of compaction of powdery loess, and dry density is increased to 1.88g/cm ³, eliminated collapsibility of loess simultaneously, saved cost simultaneously, shortened the duration, controlled relative settlement behind the worker of high filling body preferably.

In order to realize above-mentioned technical assignment, the present invention adopts following technical solution:

The job practices of a kind of vibroroller cmpacting and the high filling body of impact-rolling associating compacting loess is characterized in that constructing according to the following steps:

Step 1 is is evenly spread out and put on the height to 0.4m with loose powdery loess, rolls 10 times with the walking speed of 50T vibratory roller with 3km/h;

Step 2, repeating step one treats that filling body fills the height to 1.5m, uses 25T ₃-25kJ road roller impact-rolling 20 times;

Step 3, on the basis of rolling the back filling body, continuous repeating step one and step 2 are until the design elevation of filling the high filling body of loess.

Job practices of the present invention has adopted vibroroller cmpacting and impact-rolling to unite construction, the degree of compaction of powdery loess can be increased to 0.98, has eliminated collapsibility of loess, has saved cost simultaneously, has shortened the duration, has controlled relative settlement behind the worker of high filling body preferably.

Description of drawings

Fig. 1 is a workflow diagram of the present invention;

The present invention is described in detail below with reference to Figure of description and embodiment.

The specific embodiment

As shown in Figure 1,, loose powdery loess is is evenly spread out and put on the height to 0.4m,, roll 10 times, evenly spread out and put on the loose powdery loess of the second layer then, roll in the same way again 10 times with the walking speed of 50T vibratory roller with 3km/h at construction area; Treat that filling body fills the height to 1.5m, uses 25T ₃-25kJ road roller impact-rolling 20 times; On the basis of rolling the back filling body, repeat above-mentioned steps until the design elevation of filling the high filling body of loess.

Below principle of the present invention is described:

At construction area, loose powdery loess is is evenly spread out and put on the height to 0.4m, roll 10 times with the walking speed of 50T vibratory roller with 3km/h, so just guaranteed the consolidation effect and the uniformity of vibratory roller.

When filling of filling body, use 25T to 1.5m ₃-25kJ road roller impact-rolling 20 times, later every 1.5m once carries out reinforcement, can increase substantially the degree of compaction of filling body, has saved cost simultaneously.

On the basis of rolling the back filling body, constantly repeat above-mentioned two steps, filling body is filled and compacting, until the design elevation of filling the high filling body of loess.So just guaranteed that powdery loess is as the whole consolidation effect of the filling body of filling material.

Prove after tested, the filling body that adopts job practices of the present invention to obtain, degree of compaction average is 0.986, dry density is increased to 1.88g/cm ³, modulus of compressibility reaches 24.1MPa, compares with independent employing vibroroller cmpacting and impact-rolling technology, and its each index improves fairly obvious, as shown in table 1.Collapsibility of loess is eliminated substantially, has saved cost simultaneously, has shortened the duration, has controlled relative settlement behind the worker of high filling body preferably.

Table 1 adopts the effect contrast of different compaction technology compacting loess

Annotate: each index is all got trial zone soil sample test average as a result in the table.

Claims (1)

1. the job practices of vibroroller cmpacting and the high filling body of impact-rolling associating compacting loess is characterized in that constructing according to the following steps:

Step 1 is is evenly spread out and put on the height to 0.4m with loose powdery loess, rolls 10 times with the walking speed of 50T vibratory roller with 3km/h;

Step 2, repeating step one treats that filling body fills the height to 1.5m, uses 25T ₃-25kJ road roller impact-rolling 20 times;

Step 3, on the basis of rolling the back filling body, continuous repeating step one and step 2 are until the design elevation of filling the high filling body of loess.