"Hello Mayor! Hello Secretary-General! Vice Mayor Wang Changlin and Deputy Secretary-General Lin Yong wore raincoats and rain boots, stepped out of the car, smiled and raised their hands in reply. It was almost noon, although it was still raining, there were still many people on the embankment, Wang Changlin walked briskly, and said to Secretary General Lin Yong beside him: "Please invite experts from the city to come." Xiang Hui had already run up here, and hurriedly said, "Secretary-General, let me inform you." Turning his head and walking back, the staff of Wuchuan County had already invited Hu Liangxing, a hydrological engineer, and Zhang Qunying, Liu Tianning, a construction engineer.

"Three experts, should we listen to the report first, or do we conduct a field survey first?" Wang Changlin stopped and asked for their opinions.

"Secretary Zhang, the county magistrate of Chen, are there many places where pipe surges occur? How far away? The three of them discussed briefly, and the older Zhang Qunying asked.

"There are three places, all of which are not far apart, and after emergency clearance, they are now generally stable, and they are not far from the front." Zhang Xianren has been at the scene, familiar with the situation, and hurriedly said.

"Mayor, secretary general, our opinion, let's go to the scene first and see how the comrades in Wuchuan County deal with it, the pipe surge is very important, it is changing rapidly, and there is no room for the slightest mistake." Zhang Qunying said cautiously.

"Okay! Respect the views of the Group of Experts. Vice Mayor Wang Changlin said decisively. A group of more than a dozen people walked along the embankment for several hundred meters, the turbulent lake water was less than one meter from the embankment, and the waves stirred up hit the people's bodies and faces, which were stopped by layers of colored striped cloth, and retreated, but they came up again in a few minutes, and it went back and forth, which was very worrying.

"The phenomenon that the soil particles in the dam body or dam foundation are carried away by seepage is called pipe surge, and it also refers to the general term for the danger of 'flowing soil' and 'latent erosion' in the flat land in the embankment under the condition of high water level in the flood season. This kind of danger is generally called turning sand and drum water in Jiangbei Province, and it is called bubble spring in Jiangxi Province. Under the action of seepage flow, the pore channel formed by the fine particles in the soil is moved and lost, and the pores of the soil continue to expand, and the seepage volume also increases, which eventually leads to the formation of a penetrating seepage channel in the soil and the destruction of the soil. Zhang Qunying gave Mayor Wang Changlin a popular science while walking, "When the pipe surge occurs, the water surface appears to turn over flowers, with the upstream water level rising, the duration is extended, the danger continues to deteriorate, a large amount of water gushes and sand, so that the embankment, sluice foundation soil skeleton destruction, hole expansion, foundation soil is hollowed out, causing building collapse, resulting in embankment breaking, dam collapse, reverse gate and other accidents. ”

"Hmmm! I have a general understanding of the causes and harms, how do you deal with them simply? Vice Mayor Wang Changlin said as he went down the embankment with the comrades who led the way and walked towards the foot of the embankment. A staff member had already handed over a bamboo cane, and it was much more stable to walk.

"The basic idea of rushing to protect the pipe surge is to intercept the back, guide the pressure at the same time, reduce the seepage pressure, and prevent the seepage from bringing out the sediment." Zhang Qunying said while coming to a pipe gushing, only to see that the soil bags were erected around the water hole, and a well-enclosed well was built, the bottom of the well wall was in close contact with the ground, and the well was paved with sand and gravel or firewood and grass filter material according to the requirements of three-layer filtration, and a drainage pipe was installed at the wellhead to lead away the seeping clean water to prevent the overflow from collapsing the well wall.

"How? Did the comrades of Wu Chuan handle it correctly? Vice Mayor Wang Changlin looked at Zhang Qunying, who was bending down to pick up the gravel, and asked eagerly, next to Chen Zhongping, Zhang Xianren, and a large group of rescue personnel from Wuchuan County, all of whom opened their eyes wide and looked at him nervously. Zhang Qunying didn't speak, took a shovel next to him and picked up the bottom soil, and waited for a while, the water flow gradually became clear, and then he said happily: "The comrades of Wuchuan handled it completely correctly. Everyone breathed a sigh of relief, "However, generally speaking, the middle and lower reaches of the Yangtze River plain belongs to alluvial strata, with clay soil on top, silt and fine sand below, and clay soil interlayers between sand layers, and strong permeable layers such as gravel and pebbles below, which are exposed in the riverbed and communicate with the river water." Zhang Qunying continued, and took out a pen and paper to draw a sketch, there are four layers, "in the flood season high water level due to the seepage flow through the strong permeable layer pressure loss is very small, the embankment within a range of hundreds of meters under the clay layer is still under a lot of water pressure, if this water pressure, break through the clay layer, the following silt and fine sand will flow out with the water, in the absence of the protection of the filter layer, resulting in pipe surge." ”

Zhang Qunying said while briefly discussing with the two experts and the counterparts from Wuchuan County for a few minutes, "The area of the pipe gushing here is relatively large, and our expert group suggests," Zhang Qunying pointed around, "Around the water hole, two low weirs are enclosed with soil bags, and the periphery is tamped with sandbags, and the area can be appropriately expanded to ensure sufficient pressure." ”

"Okay! The opinion of the expert group is an order! Vice Mayor Wang Changlin said decisively, "Comrade Zhongping, Comrade Xianren, hurry up and execute." The comrades of Wuchuan County hurriedly took action, and teams of militiamen, fire fighters, as well as cadres of government agencies, and local residents, came in an endless stream, carrying sandbags and stones, and building them according to the requirements of the engineers.

"Mayor, Secretary-General, let's go back to the temporary headquarters first, right?" Secretary Zhang Xianren whispered beside him. Wang Changlin saw that the order was being carried out in an orderly manner, and he was standing here in the way, so he was not hypocritical at the moment, and said happily: "Okay!" Let's go to a joint meeting to discuss and decide on the next step in flood control. ”

The temporary headquarters was in the township drainage and irrigation station not far away, and first hastily ate a bowl of noodles, and then held a meeting.

"Comrades, the Municipal Party Committee and Municipal Government have sent me and Secretary-General Lin to Wuchuan to guide the flood control work, which is a great trust in us. From today onwards, Secretary-General Lin and I will eat, live and be on duty with you, and the water will not recede, and we will never go back! Vice Mayor Wang Changlin's words were short and powerful, and won warm applause from everyone. Wang Changlin pressed down with his hand, and tilted his head to the county magistrate Chen Zhongping and Secretary Zhang Xianren next to him. "Comrades of Wu Chuan, the work is in place, the measures are also effective, and the preparations are also done well." The two chief officers of the martial arts department furrowed their brows.

"However, this year's flood control situation is different from the past, the situation is very serious and may continue to deteriorate, everyone should be mentally prepared for long-term flood fighting." Wang Changlin deliberately paused, drank saliva, and continued: "Therefore, I suggest that the Wuchuan County Flood Control Headquarters be subdivided into three groups, one is the command group for rushing to block and prevent seepage, the second is the flood control equipment support group, and the third is the on-duty inspection and discipline inspection group, which is both division of labor and cooperation. Mayor Wang Changlin said that it was a suggestion, but in fact it was irresistible, and designated Quan Minghua to join the on-duty inspection and discipline inspection team, and Han Dong to join the flood control equipment support group. Zhang Chen and the others hurriedly arranged.

"Secretary Zhang, the Ming Transmission telegram from the National Defense General and the Provincial Defense Office." The staff took a piece of paper and handed it to Zhang Xianren, who was the commander-in-chief of Wuchuan flood control. Secretary Zhang Xianren took a brief look at it and handed it to Mayor Wang Changlin, who read it and then circulated it in turn, to the effect that it reminded all provinces and municipalities that Typhoon Hongyan will make landfall tomorrow night, and will bring a lot of rain and strong winds. After a while, the phone notice from the Jiangcheng Municipal Party Committee and Municipal Axe also arrived, saying the same thing. Thinking that the windy weather would stir up the lake, stir up huge waves, and beat the blistered embankment, Vice Mayor Wang Changlin was very melancholy, and glanced at the comrades attending the meeting, only to see Zhang Qunying and his peers briefly communicated, raised his hand, and Wang Changlin nodded heavily.

"The mayor, the secretary-general, the leaders, the opinion of our expert group, where the pipe surge occurs, the terrain is relatively low, the embankment is not firm, and it is at the low end of the embankment curve, and the force is the greatest, so it is necessary to strengthen control. The safest way is to build a cofferdam on the periphery of the frontal surface before the typhoon arrives to reduce the impact of the lake on the embankment. "This requires a row of piles to be driven in the middle of the river not far from the embankment, connected by barbed wire, and then thrown stones and sandbags piled up to form a solid new embankment." The amount of work will be large. ”

Deputy Secretary-General Lin Yong glanced at Wang Changlin with concern and prompted: "Mayor Changlin, do you want to ask for support from the city?" "Deputy Secretary-General Lin Yong is slightly older than Wang Changlin and is very experienced in doing things. Wang Changlin quickly calculated in his mind: As the supreme commander of Wuchuan's flood control work, his responsibility is heavier than Mount Tai, and if he had not asked for support from the city and there were accidents such as the bursting of the embankment or the overflow of the embankment, not to mention anything else, the judgment that he did not pay enough attention to the leadership, and the command was wrong was absolutely indispensable. Immediately, his face turned pale: "Secretary General Lin is very thoughtful, and immediately asked for support from the city!" (To be continued.) )